XR-2206...the analog plus company TM

Monolithic Function GeneratorJune 1997-3

FEATURES D Low-Sine Wave Distortion, 0.5%, Typical D Excellent Temperature Stability, 20ppm/C, Typ. D Wide Sweep Range, 2000:1, Typical D Low-Supply Sensitivity, 0.01%V, Typ. D Linear Amplitude Modulation D TTL Compatible FSK Controls D Wide Supply Range, 10V to 26V D Adjustable Duty Cycle, 1% TO 99%

APPLICATIONS D Waveform Generation D Sweep Generation D AM/FM Generation D V/F Conversion D FSK Generation D Phase-Locked Loops (VCO)

GENERAL DESCRIPTION The XR-2206 is a monolithic function generator integrated circuit capable of producing high quality sine, square, triangle, ramp, and pulse waveforms of high-stability and accuracy. The output waveforms can be both amplitude and frequency modulated by an external voltage. Frequency of operation can be selected externally over a range of 0.01Hz to more than 1MHz. The circuit is ideally suited for communications, instrumentation, and function generator applications requiring sinusoidal tone, AM, FM, or FSK generation. It has a typical drift specification of 20ppm/C. The oscillator frequency can be linearly swept over a 2000:1 frequency range with an external control voltage, while maintaining low distortion.

ORDERING INFORMATIONOperating Temperature Range -55C to +125C 40C to +85C 0C to +70C 0C to +70C

Part No. XR-2206M XR-2206P XR-2206CP XR-2206D

Package 16 Lead 300 Mil CDIP 16 Lead 300 Mil PDIP 16 Lead 300 Mil PDIP 16 Lead 300 Mil JEDEC SOIC

Rev. 1.03E1972

EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 z (510) 668-7000 z (510) 668-7017 1

XR-2206

VCC 4 TC1 Timing Capacitor TC2 6 5 VCO

GND 12

BIAS 10 11 SYNCO

Timing Resistors

TR1

7 Current Switches Multiplier And Sine Shaper

TR2 FSKI AMSI

8 9 1

+1

2

STO

3

MO

WAVEA1 13 WAVEA2 14 SYMA1 15 SYMA2 16

Figure 1. XR-2206 Block Diagram

Rev. 1.03 2

XR-2206

AMSI STO MO VCC TC1 TC2 TR1 TR2

1 2 3 4 5 6 7 8

16 15 14 13 12 11 10 9

SYMA2 SYMA1 WAVEA2 WAVEA1 GND SYNCO BIAS FSKI

AMSI STO MO VCC TC1 TC2 TR1 TR2

1 2 3 4 5 6 7 8

16 15 14 13 12 11 10 9

SYMA2 SYMA1 WAVEA2 WAVEA1 GND SYNCO BIAS FSKI

16 Lead PDIP, CDIP (0.300)

16 Lead SOIC (Jedec, 0.300)

PIN DESCRIPTIONPin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Symbol AMSI STO MO VCC TC1 TC2 TR1 TR2 FSKI BIAS SYNCO GND WAVEA1 WAVEA2 SYMA1 SYMA2 I I I I I I O O I O O Type I O O Description Amplitude Modulating Signal Input. Sine or Triangle Wave Output. Multiplier Output. Positive Power Supply. Timing Capacitor Input. Timing Capacitor Input. Timing Resistor 1 Output. Timing Resistor 2 Output. Frequency Shift Keying Input. Internal Voltage Reference. Sync Output. This output is a open collector and needs a pull up resistor to VCC. Ground pin. Wave Form Adjust Input 1. Wave Form Adjust Input 2. Wave Symetry Adjust 1. Wave Symetry Adjust 2.

Rev. 1.03 3

XR-2206DC ELECTRICAL CHARACTERISTICSTest Conditions: Test Circuit of Figure 2 Vcc = 12V, TA = 25C, C = 0.01mF, R1 = 100kW, R2 = 10kW, R3 = 25kW Unless Otherwise Specified. S1 open for triangle, closed for sine wave.XR-2206M/P Parameters General Characteristics Single Supply Voltage Split-Supply Voltage Supply Current Oscillator Section Max. Operating Frequency Lowest Practical Frequency Frequency Accuracy Temperature Stability Frequency Sine Wave Amplitude Stability2 Supply Sensitivity Sweep Range Sweep Linearity 10:1 Sweep 1000:1 Sweep FM Distortion Recommended Timing Components Timing Capacitor: C Timing Resistors: R1 & R2 Triangle Sine Wave Triangle Amplitude Sine Wave Amplitude Max. Output Swing Output Impedance Triangle Linearity Amplitude Stability Sine Wave Distortion Without Adjustment With Adjustment 2.5 0.4 1.0 2.5 0.5 1.5 % % R1 = 30kW See Figure 7 and Figure 8 40 Output1 160 60 6 600 1 0.5 80 160 60 6 600 1 0.5 mV/kW mV/kW Vp-p W % dB For 1000:1 Sweep 0.001 1 100 2000 0.001 1 100 2000 mF kW 2 8 0.1 2 8 0.1 % % % fL = 1kHz, fH = 10kHz fL = 100Hz, fH = 100kHz +10% Deviation 0.5 1 0.01 +1 +10 4800 0.01 1000:1 2000:1 0.1 +4 +50 0.5 1 0.01 +2 +20 4800 0.01 2000:1 MHz Hz % of fo C = 1000pF, R1 = 1kW C = 50mF, R1 = 2MW fo = 1/R1C 10 +5 12 26 +13 17 10 +5 14 26 +13 20 V V mA R1 10kW Min. Typ. Max. XR-2206CP/D Min. Typ. Max. Units Conditions

ppm/C 0C TA 70C R1 = R2 = 20kW ppm/C %/V fH = fL VLOW = 10V, VHIGH = 20V, R1 = R2 = 20kW fH @ R1 = 1kW fL @ R1 = 2MW

Figure 5 Figure 3 Figure 2, S1 Open Figure 2, S1 Closed

Notes 1 Output amplitude is directly proportional to the resistance, R , on Pin 3. See Figure 3. 3 2 For maximum amplitude stability, R should be a positive temperature coefficient resistor. 3 Bold face parameters are covered by production test and guaranteed over operating temperature range.Rev. 1.03 4

XR-2206DC ELECTRICAL CHARACTERISTICS (CONTD)XR-2206M/P Parameters Amplitude Modulation Input Impedance Modulation Range Carrier Suppression Linearity Square-Wave Output Amplitude Rise Time Fall Time Saturation Voltage Leakage Current FSK Keying Level (Pin 9) Reference Bypass Voltage 0.8 2.9 12 250 50 0.2 0.1 1.4 3.1 0.4 20 2.4 3.3 0.8 2.5 12 250 50 0.2 0.1 1.4 3 0.6 100 2.4 3.5 Vp-p ns ns V mA V V Measured at Pin 11. CL = 10pF CL = 10pF IL = 2mA VCC = 26V See section on circuit controls Measured at Pin 10. 50 100 100 55 2 50 100 100 55 2 kW % dB % For 95% modulation Min. Typ. Max. XR-2206CP/D Min. Typ. Max. Units Conditions

Notes 1 Output amplitude is directly proportional to the resistance, R , on Pin 3. See Figure 3. 3 2 For maximum amplitude stability, R should be a positive temperature coefficient resistor. 3 Bold face parameters are covered by production test and guaranteed over operating temperature range.

Specifications are subject to change without notice

ABSOLUTE MAXIMUM RATINGS Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26V Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . 750mW Derate Above 25C . . . . . . . . . . . . . . . . . . . . . . 5mW/C Total Timing Current . . . . . . . . . . . . . . . . . . . . . . . . 6mA Storage Temperature . . . . . . . . . . . . -65C to +150C

SYSTEM DESCRIPTION The XR-2206 is comprised of four functional blocks; a voltage-controlled oscillator (VCO), an analog multiplier and sine-shaper; a unity gain buffer amplifier; and a set of current switches. The VCO produces an output frequency proportional to an input current, which is set by a resistor from the timingRev. 1.03 5

terminals to ground. With two timing pins, two discrete output frequencies can be independently produced for FSK generation applications by using the FSK input control pin. This input controls the current switches which select one of the timing resistor currents, and routes it to the VCO.

XR-2206VCC

1mF 4 1 5 C 6 FSK Input 9 7 8VCO

16 Mult. And Sine Shaper 15 14 13 Current Switches 2 11 10 12 1mF 3 R3 25K + 1mF VCC 5.1K 5.1K

Symmetry Adjust 25K S1 = Open For Triangle = Closed For Sinewave THD Adjust 500 Triangle Or Sine Wave Output Square Wave Output

S1

R1 R2

+1

XR-2206 10K VCC

Figure 2. Basic Test Circuit

5 4 3 2 1

0

Rev. 1.03 6

Triangle Sinewave 20 40 60 80 100 R3 in (KW)

6 Peak Output Voltage (Volts)

26

70C Max. Package Dissipation 1KW

22 ICC (mA) 2KW 10KW 14 30KW 10 8 12 16 20 24 28 VCC (V)

18

Figure 3. Output Amplitude as a Function of the Resistor, R3, at Pin 3

Figure 4. Supply Current vs Supply Voltage, Timing, R

XR-220610MMAXIMUM TIMING R

Timing Resistor ( W )

1M

1.0

NORMAL RANGE

100K

TYPICAL VALUE

0.5

10K

1K

MINIMUM TIMING R

10-2

10

102

104

106

Frequency (Hz)

Figure 5. R versus Oscillation Frequency.

Figure 6. Normalized Output Amplitude versus DC Bias at AM Input (Pin 1)

5

5

4

3

3

2

2

1

1

0

1.0

10

100

103

0 10 100 1K 10K 100K 1M Frequency (Hz)

Timing R K(W)

Figure 7. Trimmed Distortion versus Timing Resistor.

Figure 8. Sine Wave Distortion versus Operating Frequency with Timing Capacitors Varied.

Rev. 1.03 7

Distortion (%)

Distortion (%)

C = 0.01mF Trimmed For Minimum Distortion At 30 KW

4

4V 4V 0 VCC / 2 DC Voltage At Pin 1 R=3KW VOUT =0.5VRMS Pin 2 RL=10KW

Normal Output Amplitude

XR-22063 C=0.01mF 2 Frequency Drift (%) 1 R=200KW 0 R=10KW R=2KW R=1KW -2 R=1KW -25 0 25 50 75 100 -3 -50 IC R=1MW Sweep Input Rc + VC R IB IT Pin 7 or 8 R=1MW R=2KW R=10KW R=200KW

-1

+ 3V 12

Ambient Temperature (C)

Figure 9. Frequency Drift versus Temperature.VCC

1 5 C 6 9 7 8 Current Switches +1VCO

2M

R1

1K

R

Figure 11. Circuit tor Sine Wave Generation without External Adjustment. (See Figure 3 for Choice of R3)Rev. 1.03 8

VCC

125

Figure 10. Circuit Connection for Frequency Sweep.

1mF 4 16 Mult. And Sine Shaper 15 14 13 2 11 10 + 1mF + 10mF VCC 12 3 R3 50K XR-2206 10K S1 200 Triangle Or Sine Wave Output Square Wave Output S1 Closed For Sinewave

5.1K

5.1K

XR-2206VCC

1mF 4 1 5 1 F= RC C 6 9 R1 7 8 Current Switches +1VCO

16 Mult. And Sine Shaper 15 14 13 2 11 10 + 1mF 12 3 R3 50K + 10mF VCC 5.1K 5.1K

Symmetry Adjust 25K RB S1 Closed For Sinewave S1 RA 500 Triangle Or Sine Wave Output Square Wave Output 10K VCC

2M

1K

R

XR-2206

Figure 12. Circuit for Sine Wave Generation with Minimum Harmonic Distortion. (R3 Determines Output Swing - See Figure 3)

VCC

1mF 1 5 >2V