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Low Noise, Low Distortion Instrumentation Amplifier … · 1 INA103 Low Noise, Low Distortion...

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Low Noise, Low Distortion INSTRUMENTATION AMPLIFIER FEATURES LOW NOISE: 1nV/Hz LOW THD+N: 0.0009% at 1kHz, G = 100 HIGH GBW: 100MHz at G = 1000 WIDE SUPPLY RANGE: ±9V to ±25V HIGH CMRR: >100dB BUILT-IN GAIN SETTING RESISTORS: G = 1, 100 UPGRADES AD625 APPLICATIONS HIGH QUALITY MICROPHONE PREAMPS (REPLACES TRANSFORMERS) MOVING-COIL PREAMPLIFIERS DIFFERENTIAL RECEIVERS AMPLIFICATION OF SIGNALS FROM: Strain Gages (Weigh Scale Applications) Thermocouples Bridge Transducers DESCRIPTION The INA103 is a very low noise, low distortion mono- lithic instrumentation amplifier. Its current-feedback circuitry achieves very wide bandwidth and excellent dynamic response. It is ideal for low-level audio signals such as balanced low-impedance microphones. The INA103 provides near-theoretical limit noise per- formance for 200source impedances. Many indus- trial applications also benefit from its low noise and wide bandwidth. Unique distortion cancellation circuitry reduces dis- tortion to extremely low levels, even in high gain. Its balanced input, low noise and low distortion provide superior performance compared to transformer-coupled microphone amplifiers used in professional audio equipment. The INA103’s wide supply voltage (±9 to ±25V) and high output current drive allow its use in high-level audio stages as well. A copper lead frame in the plastic DIP assures excellent thermal performance. The INA103 is available in 16-pin plastic DIP and SOL-16 surface-mount packages. Commercial and In- dustrial temperature range models are available. –Input +Input +Gain Sense 3k60.6G = 100 –R –Gain Drive +Gain Drive Ref Sense Output 6k6k6k3kG + + + +R G 16 15 2 1 6 13 14 12 5 7 11 10 V– 9 8 V+ 3 4 Offset Null Offset Null –Gain Sense A 1 A 2 A 3 6k® INA103 International Airport Industrial Park Mailing Address: PO Box 11400, Tucson, AZ 85734 Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 Tel: (520) 746-1111 Twx: 910-952-1111 Internet: http://www.burr-brown.com/ FAXLine: (800) 548-6133 (US/Canada Only) Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132 INA103 INA103 © 1990 Burr-Brown Corporation PDS-1016H Printed in U.S.A. March, 1998 SBOS003
Transcript
Page 1: Low Noise, Low Distortion Instrumentation Amplifier … · 1 INA103 Low Noise, Low Distortion INSTRUMENTATION AMPLIFIER FEATURES LOW NOISE: 1nV/√Hz LOW THD+N: 0.0009% at …

®

INA1031

Low Noise, Low DistortionINSTRUMENTATION AMPLIFIER

FEATURES LOW NOISE: 1nV/ √Hz

LOW THD+N: 0.0009% at 1kHz, G = 100

HIGH GBW: 100MHz at G = 1000

WIDE SUPPLY RANGE: ±9V to ±25V

HIGH CMRR: >100dB

BUILT-IN GAIN SETTING RESISTORS:G = 1, 100

UPGRADES AD625

APPLICATIONS HIGH QUALITY MICROPHONE PREAMPS

(REPLACES TRANSFORMERS)

MOVING-COIL PREAMPLIFIERS

DIFFERENTIAL RECEIVERS

AMPLIFICATION OF SIGNALS FROM:Strain Gages (Weigh Scale Applications)ThermocouplesBridge Transducers

DESCRIPTIONThe INA103 is a very low noise, low distortion mono-lithic instrumentation amplifier. Its current-feedbackcircuitry achieves very wide bandwidth and excellentdynamic response. It is ideal for low-level audiosignals such as balanced low-impedance microphones.The INA103 provides near-theoretical limit noise per-formance for 200Ω source impedances. Many indus-trial applications also benefit from its low noise andwide bandwidth.

Unique distortion cancellation circuitry reduces dis-tortion to extremely low levels, even in high gain. Itsbalanced input, low noise and low distortion providesuperior performance compared to transformer-coupledmicrophone amplifiers used in professional audioequipment.

The INA103’s wide supply voltage (±9 to ±25V) andhigh output current drive allow its use in high-levelaudio stages as well. A copper lead frame in the plasticDIP assures excellent thermal performance.

The INA103 is available in 16-pin plastic DIP andSOL-16 surface-mount packages. Commercial and In-dustrial temperature range models are available.

–Input

+Input

+Gain Sense

3kΩ

60.6Ω

G = 100

–R

–Gain Drive

+Gain Drive

Ref

Sense

Output

6kΩ 6kΩ

6kΩ

3kΩ

G

+

+

+

+RG

16

15

2

1

6

13

14

12

5

7

11

10

V–

9 8

V+

3 4

OffsetNull

OffsetNull

–Gain SenseA1

A2

A3

6kΩ

® INA103

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Bl vd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FA X: (520) 889-1510 • Immediate Product Info: (800) 548-6132

INA103

INA103

©1990 Burr-Brown Corporation PDS-1016H Printed in U.S.A. March, 1998

SBOS003

Page 2: Low Noise, Low Distortion Instrumentation Amplifier … · 1 INA103 Low Noise, Low Distortion INSTRUMENTATION AMPLIFIER FEATURES LOW NOISE: 1nV/√Hz LOW THD+N: 0.0009% at …

®

INA103 2

SPECIFICATIONSAll specifications at TA = +25°C, VS = ±15V and RL = 2kΩ, unless otherwise noted.

INA103KP, KU

PARAMETER CONDITIONS MIN TYP MAX UNITS

GAINRange of Gain 1 1000 V/VGain Equation (1) G = 1 + 6kΩ/RG V/VGain Error, DC G = 1 ±10V Output 0.005 0.05 %

G = 100 0.07 0.25 %Equation 0.05 %

Gain Temp. Co. G = 1 ±10V Output 10 ppm/°CG = 100 25 ppm/°CEquation 25 ppm/°C

Nonlinearity, DC G = 1 ±10V Output 0.0003 0.01 % of FS(2)

G = 100 0.0006 0.01 % of FS

OUTPUTVoltage, RL = 600Ω TA = TMIN to TMAX ±11.5 ±12 V

RL = 600Ω VS = ±25, TA = 25°C ±20 ±21 VCurrent TA = TMIN to TMAX ±40 mAShort Circuit Current ±70 mACapacitive Load Stability 10 nF

INPUT OFFSET VOLTAGEInitial Offset RTI(3) (30 + 1200/G) µV (KU Grade) (250+ 5000/G) µVvs Temp G = 1 to 1000 TA = TMIN to TMAX 1 + 20/G µV/°C

G = 1000 TA = TMIN to T MAX µV/°Cvs Supply ±9V to ±25V 0.2 + 8/G 4 + 60/G µV/V

INPUT BIAS CURRENTInitial Bias Current 2.5 12 µA

vs Temp TA = TMIN to TMAX 15 nA/°CInitial Offset Current 0.04 1 µA

vs Temp TA = TMIN to TMAX 0.5 nA/°C

INPUT IMPEDANCEDifferential Mode 60 || 2 MΩ || pFCommon-Mode 60 || 5 MΩ || pF

INPUT VOLTAGE RANGECommon-Mode Range (4) ±11 ±12 VCMR

G = 1 DC to 60Hz 72 86 dBG = 100 DC to 60Hz 100 125 dB

INPUT NOISEVoltage (5) RS = 0Ω

10Hz 2 nV/√Hz100Hz 1.2 nV/√Hz1kHz 1 nV/√Hz

Current, 1kHz 2 pA/√Hz

OUTPUT NOISEVoltage 1kHz 65 nV/√HzA Weighted, 20Hz-20kHz 20Hz-20kHz –100 dBu

DYNAMIC RESPONSE

–3dB Bandwidth: G = 1 Small Signal 6 MHzG = 100 Small Signal 800 kHz

Full Power Bandwidth G = 1VOUT = ±10V, RL = 600Ω 240 kHz

Slew Rate G = 1 to 500 15 V/µsTHD + Noise G = 100, f = 1kHz 0.0009 %Settling Time 0.1%

G = 1 VO = 20V Step 1.7 µsG = 100 1.5 µs

Settling Time 0.01%G = 1 VO = 20V Step 2 µsG = 100 3.5 µs

Overload Recovery (6) 50% Overdrive 1 µs

NOTES: (1) Gains other than 1 and 100 can be set by adding an external resistor, RG between pins 2 and 15. Gain accuracy is a function of RG. (2) FS = Full Scale.(3) Adjustable to zero. (4) VO = 0V, see Typical Curves for VCM vs VO. (5) VNOISE RTI = √V2

N INPUT + (VN OUTPUT/Gain)2 + 4KTRG. See Typical Curves. (6) Time requiredfor output to return from saturation to linear operation following the removal of an input overdrive voltage.

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®

INA1033

SPECIFICATIONS (CONT)All specifications at TA = +25°C, VS = ±15V and RL = 2kΩ, unless otherwise noted.

INA103KP, KU

PARAMETER CONDITIONS MIN TYP MAX UNITS

POWER SUPPLYRated Voltage ±15 VVoltage Range ±9 ±25 VQuiescent Current 9 12.5 mA

TEMPERATURE RANGESpecification 0 +70 °COperation –40 +85 °CStorage –40 +100 °CThermal Resistance, θJA 100 °C/W

The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumesno responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to changewithout notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrantany BURR-BROWN product for use in life support devices and/or systems.

PIN CONFIGURATION

Top View DIP or SOIC

+ Input

+ Gain Sense

+ Offset Null

– Offset Null

+ Gain Drive

+R

Ref

V–

– Input

– Gain Sense

G = 100

–R

– Gain Drive

Sense

Output

V+

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

G

G

(1)

NOTE: (1) Pin 1 Marking—SOL-16 Package

PACKAGEDRAWING TEMPERATURE

PRODUCT PACKAGE NUMBER (1) RANGE

INA103KP Plastic DIP 180 0°C to +70°CINA103KU SOL-16 211 0°C to +70°C

NOTE: (1) For detailed drawing and dimension table, please see end of datasheet, or Appendix C of Burr-Brown IC Data Book.

PACKAGE/ORDERING INFORMATION

ELECTROSTATICDISCHARGE SENSITIVITY

Any integrated circuit can be damaged by ESD. Burr-Brownrecommends that all integrated circuits be handled withappropriate precautions. Failure to observe proper handlingand installation procedures can cause damage.ESD damage can range from subtle performance degrada-tion to complete device failure. Precision integrated circuitsmay be more susceptible to damage because very smallparametric changes could cause the device not to meetpublished specifications.

ABSOLUTE MAXIMUM RATINGS (1)

Power Supply Voltage ....................................................................... ±25VInput Voltage Range, Continuous ....................................................... ±VS

Operating Temperature Range: ........................................ –40°C to +85°CStorage Temperature Range: ........................................... –40°C to +85°CJunction Temperature:

P, U Package .............................................................................. +125°CLead Temperature (soldering, 10s) ............................................... +300°COutput Short Circuit to Common ............................................. Continuous

NOTE: (1) Stresses above these ratings may cause permanent damage.

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®

INA103 4

TYPICAL PERFORMANCE CURVESAt TA = +25°C, VS = ±15V, unless otherwise noted.

OUTPUT SWING vs SUPPLY±25

±20

±15

±10

±5

±5 ±10 ±15 ±20 ±25

Power Supply Voltage (V)

Out

put V

olta

ge (

V)

INPUT VOLTAGE RANGE vs SUPPLY±25

±20

±15

±10

±5

Inpu

t Vol

tage

Ran

ge (

V)

±5 ±10 ±15 ±20 ±25

Power Supply Voltage (V)

MAX COMMON-MODE VOLTAGEvs OUTPUT VOLTAGE

22

16.5

11

5.5

Com

mon

-Mod

e V

olta

ge (

V)

0 5.5 11 16.5 22

Output Voltage (V)

V = ±25VS

V = ±15VS

OUTPUT SWING vs LOAD RESISTANCE±16

±12

±8

±4

±0

Out

put V

olta

ge (

V)

0 200 400 600 800 1k

Load Resistance ( )Ω

OFFSET VOLTAGE vs TIME FROM POWER UP(G = 100)

20

10

0

–10

–20

Cha

nge

In V

(µV

)

0 1 2 4 5

Time (min)

OS

I

3

INPUT BIAS CURRENT vs SUPPLY2.60

Inpu

t Bia

s C

urre

nt (

µA)

Power Supply Voltage (±V)

9 10 15 20 25

2.55

2.50

2.45

2.40

2.35

2.30

2.25

Page 5: Low Noise, Low Distortion Instrumentation Amplifier … · 1 INA103 Low Noise, Low Distortion INSTRUMENTATION AMPLIFIER FEATURES LOW NOISE: 1nV/√Hz LOW THD+N: 0.0009% at …

®

INA1035

TYPICAL PERFORMANCE CURVES (CONT)At TA = +25°C, VS = ±15V, unless otherwise noted.

SMALL SIGNAL TRANSIENT RESPONSE(G = 1)

Out

put V

olta

ge (

V)

Time (µs)

SMALL SIGNAL TRANSIENT RESPONSE(G = 100)

Out

put V

olta

ge (

V)

Time (µs)

LARGE SIGNAL TRANSIENT RESPONSE(G = 1)

Out

put V

olta

ge (

V)

Time (µs)

INPUT BIAS CURRENT vs TEMPERATURE6

5

4

3

2

1

Inpu

t Bia

s C

urre

nt (

µA)

–55

Temperature (°C)

0 50 100 125

LARGE SIGNAL TRANSIENT RESPONSE(G = 100)

Out

put V

olta

ge (

V)

Time (µs)

SETTLING TIME vs GAIN(0.1%, 20V STEP)

Set

tling

Tim

e (µ

s)

Gain

1 10 100 1000

10

8

6

4

2

0

Page 6: Low Noise, Low Distortion Instrumentation Amplifier … · 1 INA103 Low Noise, Low Distortion INSTRUMENTATION AMPLIFIER FEATURES LOW NOISE: 1nV/√Hz LOW THD+N: 0.0009% at …

®

INA103 6

TYPICAL PERFORMANCE CURVES (CONT)At TA = +25°C, VS = ±15V, unless otherwise noted.

SETTLING TIME vs GAIN(0.01%, 20V STEP)

Set

tling

Tim

e (µ

s)

Gain

1 10 100 1000

10

8

6

4

2

0

NOISE VOLTAGE (RTI) vs FREQUENCY

Frequency (Hz)

10 100 1k 10k

1k

100

10

1

Noi

se (

RT

I) (

nV/

Hz)

G = 500 G = 1000G = 100

G = 10

G = 1√

CMR vs FREQUENCY

Com

mon

-Mod

e R

ejec

tion

(dB

)

140

120

100

80

60

40

20

0

Frequency (Hz)

10 1M

G = 1000

100 1k 10k 100k

G = 1

G = 10

G = 500G = 100

SMALL-SIGNAL FREQUENCY RESPONSE

Gai

n (d

B)

70

60

50

40

30

20

10

0

–10

–20

–30

–40

–50

Frequency (Hz)

10 100 1k 10k 100k 1M 10M

G = 1000

G = 100

G = 10

G = 1

THD + N vs FREQUENCY1

0.1

0.010

0.001

0.0001

10 100 1k 10k 20k

TH

D +

N (

%)

Frequency (Hz)

G = 1000

G = 1

G = 100G = 10

V = +18dBuOUT

V+ POWER SUPPLY REJECTIONvs FREQUENCY

Pow

er S

uppl

y R

ejec

tion

(dB

)

140

120

100

80

60

40

20

0

Frequency (Hz)

1 1M10 100 1k 10k 100k

G = 10G = 1000

G = 1

G = 100

Page 7: Low Noise, Low Distortion Instrumentation Amplifier … · 1 INA103 Low Noise, Low Distortion INSTRUMENTATION AMPLIFIER FEATURES LOW NOISE: 1nV/√Hz LOW THD+N: 0.0009% at …

®

INA1037

TYPICAL PERFORMANCE CURVES (CONT)At TA = +25°C, VS = ±15V, unless otherwise noted.

V– POWER SUPPLY REJECTIONvs FREQUENCY

Pow

er S

uppl

y R

ejec

tion

(dB

)

140

120

100

80

60

40

20

0

Frequency (Hz)

1 1M10 100 1k 10k 100k

G = 10

G = 100, 1000

G = 1

THD + N vs LEVEL1

0.1

0.010

0.001

0.0005

–60 –45 –30 –15 0 15

Output Amplitude (dBu)

G = 1

TH

D +

N (

%)

f = 1kHz

THD + N vs LOAD0.1

0.01

0.001

0.0001

TH

D +

N (

%)

200 400 600 800 1k

R ( )LOAD Ω

G = 1V = 20Vp-pOUT

f = 1kHz

1

0.1

0.010

0.001

0.0001

CC

IF IM

D (

%)

CCIF IMD vs AMPLITUDE

–60 –50 –40 –30 –20 –10 0 10 20

Output Amplitude (dBu)

5

G = 1000

G = 100

G = 1

G = 10

1

0.1

0.010

0.001

0.0001

CC

IF IM

D (

%)

CCIF IMD vs FREQUENCY

Frequency (Hz)

5

G = 10

2k 10k 20k

G = 1

G = 100

G = 1000

1

0.1

0.010

0.001

SM

PT

E IM

D (

%)

SMPTE IMD vs AMPLITUDE

–60 –50 –40 –30 –20 –10 0 10 20

Output Amplitude (dBu)

5

G = 1000

G = 100

G = 1

G = 10

0.0005

Page 8: Low Noise, Low Distortion Instrumentation Amplifier … · 1 INA103 Low Noise, Low Distortion INSTRUMENTATION AMPLIFIER FEATURES LOW NOISE: 1nV/√Hz LOW THD+N: 0.0009% at …

®

INA103 8

TYPICAL PERFORMANCE CURVES (CONT)At TA = +25°C, VS = ±15V unless, otherwise noted.

APPLICATIONS INFORMATIONFigure 1 shows the basic connections required for operation.Power supplies should be bypassed with 1µF tantalumcapacitors near the device pins. The output Sense (pin 11)and output Reference (pin 7) should be low impedanceconnections. Resistance of a few ohms in series with theseconnections will degrade the common-mode rejection of theamplifier.To avoid oscillations, make short, direct connection to thegain set resistor and gain sense connections. Avoid runningoutput signals near these sensitive input nodes.

INPUT CONSIDERATIONSCertain source impedances can cause the INA103 to oscil-late. This depends on circuit layout and source or cablecharacteristics connected to the input. An input networkconsisting of a small inductor and resistor (Figure 2) cangreatly reduce the tendancy to oscillate. This is especially

useful if various input sources are connected to the INA103.Although not shown in other figures, this network can beused, if needed, with all applications shown.

GAIN SELECTIONGains of 1 or 100V/V can be set without external resistors.For G = 1V/V (unity gain) leave pin 14 open (no connec-tion)—see Figure 4. For G = 100V/V, connect pin 14 to pin6—see Figure 5.

Gain can also be accurately set with a single external resistoras shown in Figure 1. The two internal feedback resistors arelaser-trimmed to 3kΩ within approximately ±0.1%. Thetemperature coefficient of these resistors is approximately50ppm/˚C. Gain using an external RG resistor is—

G = 1 + 6kΩR

G

1

0.1

0.010

0.001

SM

PT

E IM

D (

%)

SMPTE IMD vs FREQUENCY

Frequency (Hz)

5

2k 10k 20k

0.0005

G = 1000

G = 100

G = 1

G = 10

CURRENT NOISE SPECTRAL DENSITY100

Cur

rent

Noi

se D

ensi

ty (

pA/

Hz)

1 10 100 1k 10k

Frequency (Hz)

1

10

Page 9: Low Noise, Low Distortion Instrumentation Amplifier … · 1 INA103 Low Noise, Low Distortion INSTRUMENTATION AMPLIFIER FEATURES LOW NOISE: 1nV/√Hz LOW THD+N: 0.0009% at …

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INA1039

Accuracy and TCR of the external RG will also contribute togain error and temperature drift. These effects can be di-rectly inferred from the gain equation.

Connections available on A1 and A2 allow external resistorsto be substituted for the internal 3kΩ feedback resistors. Aprecision resistor network can be used for very accurate andstable gains. To preserve the low noise of the INA103, thevalue of external feedback resistors should be kept low.Increasing the feedback resistors to 20kΩ would increasenoise of the INA103 to approximately 1.5nV/√Hz. Due tothe current-feedback input circuitry, bandwidth would alsobe reduced.

NOISE PERFORMANCE

The INA103 provides very low noise with low sourceimpedance. Its 1nV/√Hz voltage noise delivers near theo-retical noise performance with a source impedance of 200Ω.

Relatively high input stage current is used to achieve thislow noise. This results in relatively high input bias currentand input current noise. As a result, the INA103 may notprovide best noise performance with source impedancesgreater than 10kΩ. For source impedance greater than 10kΩ,consider the INA114 (excellent for precise DC applica-tions), or the INA111 FET-input IA for high speed applica-tions.

OFFSET ADJUSTMENT

Offset voltage of the INA103 has two components: inputstage offset voltage is produced by A1 and A2; and, outputstage offset is produced by A3. Both input and output stageoffset are laser trimmed and may not need adjustment inmany applications.

FIGURE 2. Input Stabilization Network.

FIGURE 3. Offset Adjustment Circuit.

GAIN GAIN (dB) R G (Ω)

1 0 Note 13.16 10 277410 20 667

31.6 30 196100 40 60.6(2)

316 50 191000 60 6

NOTES: (1) No RG required for G = 1.See gain-set connections in Figure 4.(2) RG for G = 100 is internal. Seegain-set connection in Figure 5.

FIGURE 1. Basic Circuit Configuration.

Offset voltage can be trimmed with the optional circuitshown in Figure 3. This offset trim circuit primarily adjuststhe output stage offset, but also has a small effect on inputstage offset. For a 1mV adjustment of the output voltage, theinput stage offset is adjusted approximately 1µV. Use thisadjustment to null the INA103’s offset voltage with zerodifferential input voltage. Do not use this adjustment to nulloffset produced by a sensor, or offset produced by subse-quent stages, since this will increase temperature drift.

To offset the output voltage without affecting drift, use thecircuit shown in Figure 4. The voltage applied to pin 7 issummed at the output. The op amp connected as a bufferprovides a low impedance at pin 7 to assure good common-mode rejection.

Figure 5 shows a method to trim offset voltage in AC-coupled applications. A nearly constant and equal input biascurrent of approximately 2.5µA flows into both input termi-nals. A variable input trim voltage is created by adjusting thebalance of the two input bias return resistances throughwhich the input bias currents must flow.

11

16

7 VOUT

1

50Ω

50Ω

1.2µH

1.2µH

INA10311

10

7RGVIN

16

15

13

14

6

2

1

RL

INA103VO = G • VIN

8+

V–

+

+

9

V+1µF Tantalum

11 10

7RGVIN

16

15

13

14

6

2

1

INA103∆ VOUT

3

4

10kΩ

V–

Offset AdjustRange = ±250mV.

G = 1 + —–6kΩRG

RTI

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INA103 10

Figure 6 shows an active control loop that adjusts the outputoffset voltage to zero. A2, R, and C form an integrator thatproduces an offsetting voltage applied to one input of theINA103. This produces a –6dB/octave low frequency roll-off like the capacitor input coupling in Figure 5.

COMMON-MODE INPUT RANGE

For proper operation, the combined differential input signaland common-mode input voltage must not cause the inputamplifiers to exceed their output swing limits. The linearinput range is shown in the typical performance curve“Maximum Common-Mode Voltage vs Output Voltage.”For a given total gain, the input common-mode range can beincreased by reducing the input stage gain and increasing theoutput stage gain with the circuit shown in Figure 7.

OUTPUT SENSE

An output sense terminal allows greater gain accuracy indriving the load. By connecting the sense connection at theload, I•R voltage loss to the load is included inside thefeedback loop. Current drive can be increased by connect-ing a current booster inside the feedback loop as shown inFigure 11.

FIGURE 6. Automatic DC Restoration.

FIGURE 4. Output Offsetting. FIGURE 5. Input Offset Adjustment for AC-Coupled Inputs.

11

10

7

16

15

13

14

6

2

1

INA103

–In

+In50kΩ (1) 50kΩ (1)

100kΩ (1)

VOUT

Gain = 100V/V(40dB)

NOTE: (1) 50k R, 100k pot ismax recommended value. Usesmaller values in this ratio if possible.

Ω Ω

IB–

IB+

IB– ≈ IB+ ≈ 2.5µA

11

10

7

16

15

13

14

6

2

1

INA103

–In

+In

100kΩ (1)

VOUT

+

–100kΩ (1)

10kΩ

2kΩ

100kΩR

C1µF

Gain = 100V/V(40dB)

NOTE: (1) 100k is max recommendedvalue. Use smaller value if possible.

Ω

1/2 OPA1013

A2

f–3dB = Gain12π RC

11 10

7

16

15

13

14

6

2

1

INA103

150Ω–

+

150Ω10kΩ

OPA27

100µA(1)

Offset AdjustmentRange = ±15mV

V–

VOUT

V+

NOTE: (1) 1/2 REF200

100µA(1)

∆VIN

Gain = 1V/V(0dB)

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®

INA10311

12

7

5

RG

16

15

13

14

6

2

1

INA103

VOUT

RF

11 10

RF

G = 1+2R

RG

F

NOTE: AD625 equivalent pinout.

VIN∆

RF > 10kΩ can increase noise and reduce bandwidth—see text.

FIGURE 7. Gain Adjustment of Output Stage. FIGURE 8. Use of External Resistors for Gain Set.

OUTPUT STAGE R1 and R3 R2

GAIN (kΩ) (Ω)

2 1k 2.4k5 1.2k 632Ω

10 1.2k 273Ω

(R2 || 12k) + R1 + R3

(R2 || 12k)

Output Stage Gain =

11 10

7

16

15

13

14

6

2

1

INA103 VOUT

R3

R2

R1

∆VIN

A common problem with many IC op amps and instrumentation amplifiers is shown in (a). Here, the amplifier’s input is driven beyond its linear common-moderange, forcing the output of the amplifier into the supply rails. The output then “folds back”, i.e., a more positive input voltage now causes the output of the amplifierto go negative. The INA103 has protection circuitry to prevent fold-back, and as shown in (b), limits cleanly.

(a) AD625 G = 1, VIN

= ±15V, RL = 600Ω (b) INA103 G = 1, V

IN = ±15V, R

L = 600Ω

FIGURE 9. INA103 Overload Condition Performance.

11

10

7

VIN

16

15

13

14

6

2

1

INA103∆ VOUTRG

V+

V–

MJ15012

100

MJ15011

(To headphoneor speaker)

Buffer inside feedback loop

Ω

11 10

7

16

15

13

14

6

2

1

INA103

20Ω CMRTrim

10Ω

∆VIN

Gain = 1V/V(0dB)

Introducesapproximately

+0.2% Gain Error.

FIGURE 11. Increasing Output Circuit Drive.FIGURE 10. Optional Circuit for Externally Trimming CMR.

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®

INA103 12

FIGURE 12. Microphone Preamplifier with Provision for Phantom Power Microphones.

FIGURE 13. Instrumentation Amplifier with Shield Driver.

FIGURE 14. Gain-of-100 INA103 with FET Buffers.

1110

7VIN

16

15

13

14

6

2

1

INA103

VIN∆V = 100OUT

+OPA627

+OPA627

Gain = 100V/V(40dB)

11 10

7

16

15

13

14

6

2

1

VOUTINA103

10Ω

1kΩGainAdjust

2.2kΩ

240Ω

47µF/63V

+

2.2kΩ

240Ω

47µF/63V

++48V

20dBPad

20dBPad

47kΩ6.8kΩ

6.8kΩ1

3

2

cm

1µF100kΩ

+OPA627

PhantomPower

Output offset voltagecontrol loop.

12

5

16

15

13

14

6

2

1

INA10311

10

7VOUT

10kΩ 10kΩ

VIN∆

+

10kΩ10kΩ

OPA602

100Ω

Shield driver minimizes degradation of CMR due to distributed capacitance on the input lines.

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PACKAGE OPTION ADDENDUM

www.ti.com 5-Aug-2016

Addendum-Page 1

PACKAGING INFORMATION

Orderable Device Status(1)

Package Type PackageDrawing

Pins PackageQty

Eco Plan(2)

Lead/Ball Finish(6)

MSL Peak Temp(3)

Op Temp (°C) Device Marking(4/5)

Samples

INA103KP ACTIVE PDIP N 16 25 Green (RoHS& no Sb/Br)

CU NIPDAU N / A for Pkg Type -40 to 85 INA103KP

INA103KPG4 ACTIVE PDIP N 16 25 Green (RoHS& no Sb/Br)

CU NIPDAU N / A for Pkg Type -40 to 85 INA103KP

INA103KU ACTIVE SOIC DW 16 40 Green (RoHS& no Sb/Br)

CU NIPDAU-DCC Level-3-260C-168 HR INA103KU

INA103KU/1K ACTIVE SOIC DW 16 1000 Green (RoHS& no Sb/Br)

CU NIPDAU-DCC Level-3-260C-168 HR INA103KU

INA103KU/1KE4 ACTIVE SOIC DW 16 1000 Green (RoHS& no Sb/Br)

CU NIPDAU-DCC Level-3-260C-168 HR INA103KU

INA103KUG4 ACTIVE SOIC DW 16 40 Green (RoHS& no Sb/Br)

CU NIPDAU-DCC Level-3-260C-168 HR INA103KU

(1) The marketing status values are defined as follows:ACTIVE: Product device recommended for new designs.LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.PREVIEW: Device has been announced but is not in production. Samples may or may not be available.OBSOLETE: TI has discontinued the production of the device.

(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availabilityinformation and additional product content details.TBD: The Pb-Free/Green conversion plan has not been defined.Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement thatlead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used betweenthe die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weightin homogeneous material)

(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.

(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuationof the previous line and the two combined represent the entire Device Marking for that device.

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PACKAGE OPTION ADDENDUM

www.ti.com 5-Aug-2016

Addendum-Page 2

(6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finishvalue exceeds the maximum column width.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on informationprovided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken andcontinues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

Page 15: Low Noise, Low Distortion Instrumentation Amplifier … · 1 INA103 Low Noise, Low Distortion INSTRUMENTATION AMPLIFIER FEATURES LOW NOISE: 1nV/√Hz LOW THD+N: 0.0009% at …

TAPE AND REEL INFORMATION

*All dimensions are nominal

Device PackageType

PackageDrawing

Pins SPQ ReelDiameter

(mm)

ReelWidth

W1 (mm)

A0(mm)

B0(mm)

K0(mm)

P1(mm)

W(mm)

Pin1Quadrant

INA103KU/1K SOIC DW 16 1000 330.0 16.4 10.75 10.7 2.7 12.0 16.0 Q1

PACKAGE MATERIALS INFORMATION

www.ti.com 26-Jan-2013

Pack Materials-Page 1

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*All dimensions are nominal

Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)

INA103KU/1K SOIC DW 16 1000 367.0 367.0 38.0

PACKAGE MATERIALS INFORMATION

www.ti.com 26-Jan-2013

Pack Materials-Page 2

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GENERIC PACKAGE VIEW

Images above are just a representation of the package family, actual package may vary.Refer to the product data sheet for package details.

DW 16 SOIC - 2.65 mm max heightSMALL OUTLINE INTEGRATED CIRCUIT

4040000-2/H

Page 18: Low Noise, Low Distortion Instrumentation Amplifier … · 1 INA103 Low Noise, Low Distortion INSTRUMENTATION AMPLIFIER FEATURES LOW NOISE: 1nV/√Hz LOW THD+N: 0.0009% at …

www.ti.com

PACKAGE OUTLINE

C

TYP10.639.97

2.65 MAX

14X 1.27

16X 0.510.31

2X8.89

TYP0.330.10

0 - 80.30.1

(1.4)

0.25GAGE PLANE

1.270.40

A

NOTE 3

10.510.1

BNOTE 4

7.67.4

4220721/A 07/2016

SOIC - 2.65 mm max heightDW0016ASOIC

NOTES: 1. All linear dimensions are in millimeters. Dimensions in parenthesis are for reference only. Dimensioning and tolerancing per ASME Y14.5M. 2. This drawing is subject to change without notice. 3. This dimension does not include mold flash, protrusions, or gate burrs. Mold flash, protrusions, or gate burrs shall not exceed 0.15 mm, per side. 4. This dimension does not include interlead flash. Interlead flash shall not exceed 0.25 mm, per side.5. Reference JEDEC registration MS-013.

1 16

0.25 C A B

98

PIN 1 IDAREA

SEATING PLANE

0.1 C

SEE DETAIL A

DETAIL ATYPICAL

SCALE 1.500

Page 19: Low Noise, Low Distortion Instrumentation Amplifier … · 1 INA103 Low Noise, Low Distortion INSTRUMENTATION AMPLIFIER FEATURES LOW NOISE: 1nV/√Hz LOW THD+N: 0.0009% at …

www.ti.com

EXAMPLE BOARD LAYOUT

0.07 MAXALL AROUND

0.07 MINALL AROUND

(9.3)

14X (1.27)

R0.05 TYP

16X (2)

16X (0.6)

4220721/A 07/2016

SOIC - 2.65 mm max heightDW0016ASOIC

NOTES: (continued) 6. Publication IPC-7351 may have alternate designs. 7. Solder mask tolerances between and around signal pads can vary based on board fabrication site.

METAL SOLDER MASKOPENING

NON SOLDER MASKDEFINED

SOLDER MASK DETAILS

OPENINGSOLDER MASK METAL

SOLDER MASKDEFINED

LAND PATTERN EXAMPLESCALE:7X

SYMM

1

8 9

16

SEEDETAILS

SYMM

Page 20: Low Noise, Low Distortion Instrumentation Amplifier … · 1 INA103 Low Noise, Low Distortion INSTRUMENTATION AMPLIFIER FEATURES LOW NOISE: 1nV/√Hz LOW THD+N: 0.0009% at …

www.ti.com

EXAMPLE STENCIL DESIGN

R0.05 TYP

16X (2)

16X (0.6)

14X (1.27)

(9.3)

4220721/A 07/2016

SOIC - 2.65 mm max heightDW0016ASOIC

NOTES: (continued) 8. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate design recommendations. 9. Board assembly site may have different recommendations for stencil design.

SOLDER PASTE EXAMPLEBASED ON 0.125 mm THICK STENCIL

SCALE:7X

SYMM

SYMM

1

8 9

16

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Page 22: Low Noise, Low Distortion Instrumentation Amplifier … · 1 INA103 Low Noise, Low Distortion INSTRUMENTATION AMPLIFIER FEATURES LOW NOISE: 1nV/√Hz LOW THD+N: 0.0009% at …

IMPORTANT NOTICE

Texas Instruments Incorporated (TI) reserves the right to make corrections, enhancements, improvements and other changes to itssemiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyersshould obtain the latest relevant information before placing orders and should verify that such information is current and complete.TI’s published terms of sale for semiconductor products (http://www.ti.com/sc/docs/stdterms.htm) apply to the sale of packaged integratedcircuit products that TI has qualified and released to market. Additional terms may apply to the use or sale of other types of TI products andservices.Reproduction of significant portions of TI information in TI data sheets is permissible only if reproduction is without alteration and isaccompanied by all associated warranties, conditions, limitations, and notices. TI is not responsible or liable for such reproduceddocumentation. Information of third parties may be subject to additional restrictions. Resale of TI products or services with statementsdifferent from or beyond the parameters stated by TI for that product or service voids all express and any implied warranties for theassociated TI product or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.Buyers and others who are developing systems that incorporate TI products (collectively, “Designers”) understand and agree that Designersremain responsible for using their independent analysis, evaluation and judgment in designing their applications and that Designers havefull and exclusive responsibility to assure the safety of Designers' applications and compliance of their applications (and of all TI productsused in or for Designers’ applications) with all applicable regulations, laws and other applicable requirements. Designer represents that, withrespect to their applications, Designer has all the necessary expertise to create and implement safeguards that (1) anticipate dangerousconsequences of failures, (2) monitor failures and their consequences, and (3) lessen the likelihood of failures that might cause harm andtake appropriate actions. Designer agrees that prior to using or distributing any applications that include TI products, Designer willthoroughly test such applications and the functionality of such TI products as used in such applications.TI’s provision of technical, application or other design advice, quality characterization, reliability data or other services or information,including, but not limited to, reference designs and materials relating to evaluation modules, (collectively, “TI Resources”) are intended toassist designers who are developing applications that incorporate TI products; by downloading, accessing or using TI Resources in anyway, Designer (individually or, if Designer is acting on behalf of a company, Designer’s company) agrees to use any particular TI Resourcesolely for this purpose and subject to the terms of this Notice.TI’s provision of TI Resources does not expand or otherwise alter TI’s applicable published warranties or warranty disclaimers for TIproducts, and no additional obligations or liabilities arise from TI providing such TI Resources. TI reserves the right to make corrections,enhancements, improvements and other changes to its TI Resources. TI has not conducted any testing other than that specificallydescribed in the published documentation for a particular TI Resource.Designer is authorized to use, copy and modify any individual TI Resource only in connection with the development of applications thatinclude the TI product(s) identified in such TI Resource. NO OTHER LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISETO ANY OTHER TI INTELLECTUAL PROPERTY RIGHT, AND NO LICENSE TO ANY TECHNOLOGY OR INTELLECTUAL PROPERTYRIGHT OF TI OR ANY THIRD PARTY IS GRANTED HEREIN, including but not limited to any patent right, copyright, mask work right, orother intellectual property right relating to any combination, machine, or process in which TI products or services are used. Informationregarding or referencing third-party products or services does not constitute a license to use such products or services, or a warranty orendorsement thereof. Use of TI Resources may require a license from a third party under the patents or other intellectual property of thethird party, or a license from TI under the patents or other intellectual property of TI.TI RESOURCES ARE PROVIDED “AS IS” AND WITH ALL FAULTS. TI DISCLAIMS ALL OTHER WARRANTIES ORREPRESENTATIONS, EXPRESS OR IMPLIED, REGARDING RESOURCES OR USE THEREOF, INCLUDING BUT NOT LIMITED TOACCURACY OR COMPLETENESS, TITLE, ANY EPIDEMIC FAILURE WARRANTY AND ANY IMPLIED WARRANTIES OFMERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT OF ANY THIRD PARTY INTELLECTUALPROPERTY RIGHTS. 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IN NO EVENT SHALL TI BE LIABLE FOR ANY ACTUAL,DIRECT, SPECIAL, COLLATERAL, INDIRECT, PUNITIVE, INCIDENTAL, CONSEQUENTIAL OR EXEMPLARY DAMAGES INCONNECTION WITH OR ARISING OUT OF TI RESOURCES OR USE THEREOF, AND REGARDLESS OF WHETHER TI HAS BEENADVISED OF THE POSSIBILITY OF SUCH DAMAGES.Unless TI has explicitly designated an individual product as meeting the requirements of a particular industry standard (e.g., ISO/TS 16949and ISO 26262), TI is not responsible for any failure to meet such industry standard requirements.Where TI specifically promotes products as facilitating functional safety or as compliant with industry functional safety standards, suchproducts are intended to help enable customers to design and create their own applications that meet applicable functional safety standardsand requirements. Using products in an application does not by itself establish any safety features in the application. Designers mustensure compliance with safety-related requirements and standards applicable to their applications. Designer may not use any TI products inlife-critical medical equipment unless authorized officers of the parties have executed a special contract specifically governing such use.Life-critical medical equipment is medical equipment where failure of such equipment would cause serious bodily injury or death (e.g., lifesupport, pacemakers, defibrillators, heart pumps, neurostimulators, and implantables). Such equipment includes, without limitation, allmedical devices identified by the U.S. Food and Drug Administration as Class III devices and equivalent classifications outside the U.S.TI may expressly designate certain products as completing a particular qualification (e.g., Q100, Military Grade, or Enhanced Product).Designers agree that it has the necessary expertise to select the product with the appropriate qualification designation for their applicationsand that proper product selection is at Designers’ own risk. Designers are solely responsible for compliance with all legal and regulatoryrequirements in connection with such selection.Designer will fully indemnify TI and its representatives against any damages, costs, losses, and/or liabilities arising out of Designer’s non-compliance with the terms and provisions of this Notice.

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