Post on 21-Feb-2021
transcript
Circuit Description
1.RECEIVER
The signal from the antenna is passed through a transmission/reception selector circuit and is
amplified by T217. The signal after amplified enter to 1846 for processing then output the audio, the
audio signal is amplified by UTC2822 and output by the speaker at last.
AN
TW
1846
U231
UTC2822
U351 SP
.
T271
ANT
Figure1. RECEIVER CIRCUIT
2.TRANSMITTER
The signal from the microphone passes through 1846, after modulation in the carrier
modulation, the modulation signal with the carrier promotes by buffer T121,T131, and amplified by
T141 then sends to the antenna terminals.
MIC
1846
U231
MIC
T121 T131
T141
.
.
ANT
T423
Figure2.TRANSMITTER CIRCUIT
ANI
T271 U231 U351 SP
ANTSW 1846 UTC2822
1846
T121 T131
T141
T423
MIC
U231
ANI
MIC
3.TRANSMISSION/RECEPTION SELECTOR CIRCUIT
The transmission output is passed through the transmission/reception selector circuit and
low-pass filter to the antenna. The transmission/reception selector circuit, which consists of diodes
D161, D160, D261 and D262, is turned on during transmission and off during reception to switch
the signal.
4.DIGITAL CONTROL CIRCUIT
SIDE KEY AND ENCODER CIRCUIT
The signal from side key and encoder is directly input to the processor.
Reset and backup circuit
When turn on the power, a positive pulse is output from the reset circuit consisting of D831,
C831 and R831 to the third feed of reset terminal on U821 microprocessor. When turn off the power,
U517 detects a 3.3 V drop, and output a low signal, it outputs data to U811 and enter backup mode.
Figure3,digital control circuit
BATTERY VOLTAGE TEST CIRCUIT
Power supply voltage after partial pressure input to the microprocessor analog interface
BATTERY SAVE CIRCUIT
The squelch is off during receive. The power circuit enters battery save mode if no key has
been pressed for five seconds.The circuit is controlled by microprocessor directly.
5.1846 DESCRIPTION
MAINLY SECTION DESCRIPTION
1.DSP consists of IF amplifier, FM modulation, RSSI calculator, AFC control circuit, audio/audio
mixer filter, CTCSS/DCS filter and so on.
2.Synthesizer mainly functions:
1 The synthesizer produces a local oscillator signal, used to switch the RF input to a
continuous low medium frequency.
2 Synthesizer provides the base clock to adjust the VCO frequency.
3.BASE CLOCK
1846 ports more base clocks, for example, 12.8 MHz,13MHz and so on.
4.SERIAL CONTROL INTERFACE
A three lines serial control interface is used to read the main IC and 1846 control record. Serial
control is 24 characters in length, 18 bit numeric string and 6 bit address string.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
A
B
C
D
E
151413121110987654321
E
D
C
B
A
L1550R
C413224P
R4264K7
32
54
1
JK281ST-114
MIC281MICC282
104P
32
54
1
JK351ST-3013-06
AVDD 1
SCLK2SDIO3AVDD4
XTAL15XTAL26
MODE7SENB8
AFO
UT
9N
C10
MIC
_IN
11C
c12
AV
DD
13N
C14
RFI
N15
AV
DD
16
NC 17RFOUT 18NC 19NC 20AVDD 21PABIAS 22AVDD 23PDN 24
GP
IO7/
VO
X25
GP
IO6/
SQ
26G
PIO
5/TX
ON
27G
PIO
4/R
XO
N28
GP
IO3/
SD
O29
GP
IO2/
INT
30G
PIO
1/C
OD
E_I
O31
GP
IO0/
CS
S_I
O32
U231RDA1846
R25812K
L26322NH
C265470P
C3552K2
C26218P
L27522nH
E351220uF
T111NC
T1212SC3356
T141HE0009T131
HE3078
R114NC
R1120R
R115NC
R1161K5
R12110R
R122NC
R1230R
R124NC
R118330R
R119
3K9
R128100K
R12747K
R12647R
R13410P
R14147K
R14247K
R14347R
R159270R
R160270R
C113NC
C115470P
L113NC
C1160R
L11815NH
L117390NH
C117102P
C118102P
C121470P
C12233P
C124470P
C125NC
L1250R
C126NC
C127102P
C128104P
L131101T
C133102P
L1330.4/1.5/4T
L1352.2NHC135
0R
C13420P
C142470P L146
8T(0415)
L143101T
C146470P
C147103P
C148104P
C131103P C143
1uFC144103P
C151NC
C15310P
C15422P
C159100P
C156NC
L160220NH
C160470P
D160HVC131
C16112P
C162470P
C1643P
C1633P
C1662P
C1656P
C1683P5
C1674P
C1691P
L1644T(0410)
L1665T(0410)
L1685T(0410)
L16910K
ANT160ANT-2
R1040.33
R1050.33R1060.33
R170150K
R171150K
R172150K
R173150K
R174150KR175
150K
R17710K
R181220K
R18247K
R1831M
R185180K
R186
33K
C173470P
C172NC
C174103P
C175100P
C176102P
C180470P
C181103P
C182105P
C183102P
2
31
84
U170ALM2904V
76
5
U170BLM2904V
T171DTC114EE
E1804.7uF
BATT3T
3T
3T
C141470P
(T.Y.)
L2614T(0412)
C913103P
C911104P
E91310uF/6V
E91110uF/10V
BATT
R1570.31*1.2*2T
C1575P
C158NC
C114104P
D261HSC277
C2612P
D262HSC277
R35310R
C901105P
L901101T
BATTi
C903470P
BATT
BA
TT
BATT
SW351ARD810S
BA901BATTERY
D161HVC131
R146NC
R113NC
C904103P
C905104P
R814
10K
R877220R
R8751.5K
C876102P
C878102P
A0 1A1 2
GND 4DA5 CK6 A2 3WP7 Vcc8
U81124C08
D875LED(R)
D877LED(G)
T875DTC114EE
T877DTC114EE
C281220P
C841470P
R8454K7
R84647K
SP351SP-1
SW841CALL
R871100K
R87251K
R87310K
C872104P
C811104P
J8BATT
C906470P
C907470P
C136NC
C13215P
C145470P
C90210uF/10V
C284104P
R283
1K8
R284
470R
C2834.7uF/16V
XOUT 3
VC15C4
GND 2
CR22526MHz
C236104P
C235104P
C239103P
C427105P
C258104P
C23010uF/6V
C23210P
C23810P
C237102P
C233104P
L231101T
C231105P
T3512SA1362
T352DTC114EE C352
102P
R3521K
R35147K
C353102P
E3531uF/10V
C351104P
C103103P
R1022K2C102
470P
T1012SB624
R10147K
C101104P
3V3
3V3
BA
TT
i
SP+
MICAFAF i
TX
DR
XD
MIC
AF
AF
i
3V3BATTi
TXDRXDMICAFAF i
3V3BATTi
TXDRXDMICAF
3V3BATTi
TXDRXD
AF
P_AMPAPC
BATTi
TXDRXD
P_AMPAPC
APC
3V33V3
BA
TT
i
RD
A_P
DN
CH
OR
D_S
CLK
RD
A_S
CLK
/PT
T
P_TX
RDA_SCLK/PTT
TXD
BATTiBATTiBATTi
R35533K
R35910R
E3561uF
C356103P
C359104P
C104102P
T102DTC114EE
3V3
3V3
in
Gndout
U911CE6201A33P
R187
10K
C278104P
C858470P
C852470P
C854470P
C856470P
R852100R
R854100R R856
100R
R858100R
R85747K
R85547K
R85347K
R85147K
321
SW851ASW-6
654
C825103P
C823102P
C822103P
C82912P
C82812P CR828
32.768KHz
L821101T
C831102P
C845470P
SW845PTT
C843470P
SW843MONI
R8414K7
R8434K7
R84247K
R84447K
CH2CH1
CH3CH4
CH
2C
H1
CH
3C
H4
P_A
MP
RX
D
AP
C
AP
C
RDA_SDIO/CALL
TX_LED
RX_LED
BATDET
MONI/BEEP
PTT
RDA_INT
RD
A_S
Q
RD
A_C
SS
IN/O
UT
APC
3V3
P_AMP
3V3
RV22150K
C2631P L262
NC
C2754P
T276DTA114YE
P_RX
3V3
R222
22K
C22610P
C221103P
O11
VCC2
GND4 2IN- 52IN+ 6O23
IN+ 7
IN- 8
U351UTC2822
R35710R
C357104P
R35810R
C358104P
C354273P
T2713SK318
C266104P
C271102P
C274470P
C276470P
R267100K
R271220R
L276101T
L27233nH
R268100K
R269100K
C272NCC273
NC
R2661M
R272330R
L1960R
C191
0R
L1930R
C1980R
C193NC
C194NCC195
NC
C192NC
C196NC
C197NC
C223NC
C22
40R
3V3
C360NC
C227103P
R22747K
C279NC
R23910K
C253104P
R25382K
R2554K7
OS
CI
1
OS
CO
2
RE
SE
T3
P5_
04
P5_
15
P5_
26
P5_
37
P5_
48
P5_
59
P5_
610
P6_
011
P6_
112
P6_
213
P6_
314
P6_
415
P6_
516
P6_
617
P6_
718
VS
S19
VD
D20
VC
C21
P7_
022
P7_
123
P7_
224
P7_
325
P7_
426
P7_
527
P7_
628
U821SMP418U1D-110426001
C23410PB
AT
DE
T
R8474K7C847
470PSW847ALARM
R84847K
TX_LED
ALARM
C821104P
C255472P
R2544K7
C254472P
MONI/BEEP
R1842K2
T181DTA114YE
T1822SK1824
3V3
RD
A_SD
IO/C
ALL
MO
NI/
BE
EP
RX
D
TX
_LE
D
RX_LED
ALA
RM
RD
A_C
SS
IN
/OU
T
RDA_CSS IN/OUT
RDA_PDN
RDA_SQ
RD
A_C
OD
E I
N/O
UT
RDA_SCLK/PTT
RDA_INT
RD
A_S
DIO
/CA
LL
RDA_PDN
RDA_SQ
TX
D
P_AMP
RD
A_C
OD
E I
N/O
UT
RD
A_S
DIO
/CA
LL
BA
TT
iP
_AM
PA
PC
3V3
TX
D
3T 3T 3T 3T3TTX_P TX_P
TX_P
RD
A_C
OD
E IN
/OU
T
R235NC
C277102P
T277DTC114EE
C240NC
C270104P
3V3
3V3
RDA_SCLK/PTT RDA_SCLK/PTT RDA_SCLK/PTT
PTT
RD
A_S
CLK
/PT
T
TXD
RXD
SP-
R83810K
R836100R
RDA_SCLK/PTT
R83510K
C15022P
R4551M
T451MRF497
D454KDS122
C455104P
C454104P
R454
470K C452105P
R4511K
C451104P
R452100R
C456470P
3V3
MIC
VO
X_D
ET
VO
X_D
ET
VOX_DET
VO
X_D
ET
T423KTC4082(HF)
MIC
C426NCR427
102P
R425220R
R4182K2
R417
100K R4228K2
C425102P
C419104P
3T
R837100R
R83110K
R832NC
T831NC
C832NC
Out1
VDD2 NC 3
GND 4
U833R3111Q271A
D833NC
C833NC
C155NC
C294470P
T294DTC114EE
R2922K2
R2911KR294
47K
R293100K
C295470P
R295
4K7
T2912SB624
R296100K
C293NC
R297
10KC292470P
C152NC
T8332SK1824
R8341K
R83347K
R514510R C515
103PR51556K
CH
OR
D_S
CLK
NU1VDD2COUT 3VDD4
CBC 5CLK6
DATA7NU8 GND 9NU 10NU 11NU 12VDD 13NU 14NU 15NU 16
U511AUDIO-16
R513330K
C514104P
R5111K
R5121K
C51
110
4P
E352NC
R23
6
0R
Block Diagram
MO
NI
PGA
0/90LN
A
IPGA
Q
DSP
Core
Audio
filterSub
CH
filterFMm
odemA
FCloop
IAD
C
QAD
C
DA
C
AD
C
PA_drvier
LDO
Synthesize
GPIO
Interface
Bus
RSSI
MC
U
INT/G
PIO1
SQ/G
PIO2
PDN
VO
X/G
PIO3
SENSCLKSD
IOC
TSINC
TSOU
T
PA
AN
TSW LD
F
AN
T
DV
DD
AVD
D3.
3VLD
O
+-
ENC
OD
ER
LIMITER
AM
PH
PFPTTPTT
LAM
P
MIC
AF
AM
P
Benchmark
frequencyinput
RFO
UT
VC
O+-
MODEL speficition qty
0P5 C0402 1 C2735P C0402 3 C263 C275 C27210P C0402 5 C232 C226 C234 C191 C23812P C0402 2 C829 C82815P C0402 2 C261 C13227P C0402 2 C262 C13433P C0402 1 C122100P C0402 1 C175102P C0402 19 C878 C876 C425 C353 C352 C183
C277 C831 C823 C271 C237 C176C135 C133 C127 C118 C117 C104R427
103P C0402 15 C515 C913 C356 C239 C825 C822C227 C221 C147 C144 C131 C181C103 C904 C174
104P C0402 29 C511 C911 C359 C358 C357 C455C454 C451 C419 C514 C351 C278C233 C821 C235 C266 C258 C236C148 C128 C114 C253 C872 C811C284 C101 C905 C270 C282
105P C0402 3 C452 C427 C182220P C0402 1 C281224P C0402 1 C413470P C0402 28 C907 C906 C858 C856 C854 C852
C845 C843 C841 C456 C276 C265C160 C274 C146 C145 C142 C141C124 C121 C180 C173 C102 C294C295 C847 C292 C903
472P C0402 2 C255 C254473P C0402 1 C3543P C0603 1 C1636P C0603 1 C16910P C0603 1 C16413P C0603 2 C168 C16622P C0603 1 C16730P C0603 1 C16533P C0603 1 C16156P C0603 1 C15468P C0603 1 C159105P C0603 2 C231 C901470P C0603 1 C162
10uF/10V(106P) C0805 4 C902 E913 E911 C2301uF(105P) C0805 2 C143 E353
4.7uF(475P) C0805 2 E180 C2831uF EIA3216 1 E356
220uF E-06424L 1 E351
0R R0402 7 R123 R112 C224 C198 C116 C115R236
1K R0402 6 R511 R834 R352 R451 R291 R5121K5 R0402 2 R116 R8751K8 R0402 1 R2832K2 R0402 3 R102 R292 C355
capacitanceposition number
BOM
resistance
3K9 R0402 1 R1194K7 R0402 8 R295 R845 R841 R843 R255 R254
R847 R4268K2 R0402 1 R42210K R0402 10 R239 R831 R838 R187 R177 R873
R814 R835 R297 R18410R R0402 5 R359 R358 R357 R353 R12112K R0402 1 R25822K R0402 1 R22233K R0402 2 R355 R18647K R0402 17 R833 R351 R842 R857 R855 R853
R851 R294 R227 R142 R141 R127R848 R846 R844 R182 R101
47R R0402 2 R143 R12651K R0402 1 R87256K R0402 1 R51582K R0402 1 R253100K R0402 8 R293 R296 R269 R268 R267 R128
R871 R417100R R0402 7 R837 R858 R856 R854 R852 R452
R836150K R0402 6 R175 R174 R173 R172 R171 R170180K R0402 1 R185220K R0402 1 R181220R R0402 2 R425 R877270R R0402 2 R160 R159330K R0402 1 R513330R R0402 3 R272 R271 R118470K R0402 1 R454470R R0402 1 R284510R R0402 1 R514680R R0402 1 R4181M R0402 3 R455 R266 R1830R R0603 4 R134 L196 L193 L1250R R0805 1 R15710K R1206 1 L1690.39 R1206 3 R106 R105 R10450K RV1208 1 RV221
27NH L0603 2 L262 L135100NH L0603 3 L118 L263 L275220nH L0603 2 L272 L160390NH L0603 1 L117101T L0603 3 L276 L821 L231101T L0805 3 L143 L131 L901
0.4*1.5*5T 5T 2 L133 L1640.4*1.5*6T 6T 3 L261 L168 L1660.4*1.5*8T 8T 1 L1460.4*1.2*3T 3T 1 L155
LED(G) D0603 1 D877LED(R) D0603 1 D875HSC277 D-ESC 2 D262 D261HVC131 D-ESC 2 D161 D160KDS122 D-USM-MA742 1 D454
RQA0009 T-2N1A-2SK3476 1 T141
induction
diode
audion
2SK1824 T-ESM-2SK1824 2 T833 T182DTA114YE T-ESM-DTA114EE 2 T276 T181DTC114EE T-ESM-DTA114EE 7 T877 T875 T352 T277 T102 T294
T1713078 T-SOT89-2SK3078 1 T131
2SA1362 T-TSM-2SB624 1 T3512SB624 T-TSM-2SB624 2 T291 T1012SC3356 T-TSM-2SC3356(R25) 1 T121
R311Q271A T-US4 1 U8333SK318 T-US4-3SK318 1 T271MRF497 T-USM-MRF497 1 T451
KTC4082(HF) T-USM-MRF497 1 T423
RDA1846 U-QFN32(RDA1846) 1 U231AUDIO-16 U-SOIC16 1 U511
SMP418V1D-110428001 U-SOP28 1 U82124C08 U-SOP8 1 U811
UTC2822 U-SOP8 1 U351HT7333 U-SOT89-5A 1 U911
LM2904V U-SSOP8 1 U170
26MHz FX-DS0305 1 CR22532.768KHz FX-DS0603 1 CR828BATTERY JK-C BC-47S-13-D 1 BA901
SP-1 JP2-SM1.27-3 1 SP351PTT S-SKRT-1 1 SW845CALL S-SS208GS16 1 SW841MONI S-SS208GS16 1 SW843BATT J-TEST POINT 1 J8
ANT-2 PX-333-ANT 1 ANT160MIC MIC98 1 MIC281
SW-6 S-ED08C21O 1 SW851RD810S S-R087FENS 1 SW351ST-114 JK-ST-106 1 JK281
ST-3013-06 JK-ST-3013-06 1 JK351ALARM S-SKHLLBA010 1 SW847
CW50801-03 1
pinouts
PCB
integration
other
Pin No. Pin Name Function description
1 OSCIClock crystal input pin
2 OCSOClock crystal output pin
3 RESERReset pin
4 ALARMAlarm key detection pin
5 RXD read and write frequency data
6 RDA_SDIL/CALL RDA SDIL and CALL key control pin
7 RDA_CEDE IN/OUT 1846 data input/output pin
8 RDA_CSS IN/OUT 1846 CTCSS input/output pin
9 MONI/BEEP squelch key/beep control pin
10 CH4 encoder control pin
11 CH3 encoder control pin
12 CH2 encoder control pin
13 CH1 encoder control pin
14 TX_LED transmit indicator light
15 RDA_INT 1846 data control pin
16 RX_LED receive indicator light
17 TXD read and write frequency data
18 PTT PTT key control pin
19 VSS ground pin
20 VDD power
21 VCC
22 APC auto power control
23 RDA_SCLK/PTT 1846 data control pin
24 BATDET power detection pin
25 RDA_SEN 1846 data control pin
26 RDA_PDN 1846 data control pin
27 VOX-DET VOX detection pin
28 RDA_SQ squelch control pin
Chip Pin Description
Frequency Range 400-470MHz
Channel Number 16
Channel Step 12.5KHz
Antenna Impedance 50Ω
Microphone Impedance 2KΩ
work voltage 7.4V DC
Frequency Stability ±2.5×10-6ppm
carrier output power ≤5W
modulation sensitivity 8-12mV
Modulation Distortion ≤5%
Modulation Limited ≤5KHz
Adjacent Channel Power ≥65dB
Intermodulatohn Rejection ≥40dB
Sensitivity≤0.224uV
Audio Distortion ≤5%
SN RATE ≤-40
Co-Channel Rejection ≥-8dB
Blocking ≥85dB
Adjacent Channel Selectivity ≥55dB
Spurious Radiation ≥55dB
Transmitter
RECEIVER
SPECIFICATION