Motorola APX 2000 - Page 927

Schematics, Boards Overlays, and Parts Lists: Transceiver (RF) Boards: UHF1 (84012620001) 8-96
Figure 8-35. Automatic Level Control Circuit
DC_LIN_5V
DC_LIN_3V
DC_RAW_B+
IN
IN
IN
C1218M11
C1216M11
R1299M11
R1298M11
DIG_CTRL_ATTH
DIG_CTRL_I_LIMIT
IN
IN
MAKO RAMP
R1210M11 R1214M11
C1217M11C1211M11
R1209M11
ANA_CTRL_ISET
IN
C1156M11 C1174M11 C1173M11
R1225M11
C1210M11 C1214M11
E1219M11
21
C1230M11
SW_B+
IN
U1232M11
6
4
2 1
5
3
NC
NC
DNC2
DNC1
GND1
VIN
GND2
VOUT
C1237M11
DC_LIN_5VREF
R1226M11
DC_LIN_1_875V_D
IN
IN
ADDED FOR DEFAULT
HIGH
R1101M11
DIG_SPI_CLK
ANA_CTRL_VSET
IN
IN
DIG_DATA_SPI_MOSI
DIG_CTRL_TX_INH
IN
IN
PLACE
NEAR
PIN 10
C1225M11
R1219M11
R1213M11
U1208M11
DC_LIN_1_875V_D
DC_LIN_5V
TX_INH
A2
A1
D1
D2
C2
B2
C1
B1
DIR
B2
B1
GND
VCCB VCCA
A2
A1
DELAY
R1230M11
R1212M11
U1209M11
U1209M11
R1204M11
C1206M11
DC_LIN_5V
DC_LIN_1_875V_D
C2
B1
A1
A2
C1
GND
VCC
PIN 5
NEAR
PLACE
PIN 1
NEAR
PLACE
R1211M11
C1229M11
R1220M11
C1215M11
U1201M11
DC_LIN_5V
DC_LIN_5VREF
15
5
1
9
11
6
12
10
14
13
16
4
7
2
8
17
VLOGIC
SDIN
GAIN
RSTSEL
SYNC
LDAC
RESET
SCLK
GND
VDD
EPAD
NC2
NC1
SDO
VOUTB
VOUTA
VREF
3
RX FE TUNE
C1239M11
U1238M11
DC_LIN_5V
2
13
VOUT
GND
POS
U1243M11
DC_LIN_5V
25
4
1
3
R1251M11
TEMP CUTBACK
R1249M11
R1250M11
STABLE LOCATION
PLACE IN THERMALLY
R1255M11
R1254M11
Q1264M11
R1260M11
C1261M11
R1259M11
U1254M11
DC_LIN_5V
DC_LIN_5V
DC_RAW_B+
2
3
1
25
4
1
3
22K
22K
R1253M11
POWER TUNE
R1244M11
R1245M11
R1242M11
R1241M11
DC_LIN_5V
DAC SCALER
R1252M11
R1248M11
C1255M11
U1253M11
DC_LIN_5V
25
4
1
3
R1263M11
R1262M11
R1266M11
R1243M11
R1238M11
SMALLER PICKER
R1280M11
C1273M11
C1272M11
R1274M11
U1269M11
DC_LIN_5V
DC_LIN_5V
25
4
1
3
R1284M11
R1279M11
U1282M11
5
1
3
6
2
4
GND
COM
NO
NC
V_POS
IN
C1250M11
U1251M11
C1248M11
C1249M11
R1247M11
DC_LIN_5V
25
4
1
3
R1295M11 R1296M11
FWD
RVS
COUPLER
R1269M11 R1272M11
R1271M11
R1270M11
R1264M11
R1232M11
C1233M11
R1240M11
U1211M11
U1211M11
U1205M11
U1205M11
DIG_DMCS
DIG_GPIO49
DC_LIN_1_875V_D
C2
B1
A1
A2
C1
C2
B1
A1
A2
C1
GND
VCC
GND
VCC
IN
IN
C1208M11
R1228M11
C1231M11
R1218M11
R1223M11
U1217M11
IO49
TXH
DC_LIN_1_875V_D
TXH_5V
DC_LIN_5V
A2 A1
D1
D2
C2
B2
C1
B1
OUT
DIR
B2
B1
GND
VCCB
VCCA
A2
A1
R1268M11
U1257M11
U1257M11
DC_LIN_3V
TXH_1
TX_INH
C2
B1
A1
A2
C1
GND
VCC
IN
2
3
1
22K
22K
R1267M11
Q1265M11
Q1268M11
FILT_RAW_B+
2
1
3
U1256M11
R1261M11
Q1263M11
R1257M11
25
4
1
3
2
3
1
22K
22K
R1231M11
C1262M11
DC_LIN_5V
TX_7V_1
ANA_RX_FE_FILT_VTUNE
OUT
OUT
R1276M11
R1275M11
R1278M11 R1281M11
C1270M11
C1271M11
I_TO_V
C1291M11
R1289M11
C1288M11
R1287M11
C1286M11
R1277M11
R1283M11
U1202M11
DC_LIN_5V
48
1
3
2
INTEGRATOR
R1235M11
C1294M11
R1293M11
U1202M11
48
7
5
6
R1234M11
FILT_RAW_B+
OUT
R1203M11
C1205M11
R1205M11
VCTRL
VC
OUT
PDADI
BAND
R1206M11
L1202M11
C1203M11
L1201M11
R1202M11
R1297M11
R1208M11
R1207M11
C1299M11
C1202M11
C1201M11
C1204M11
U1203M11
RF_OUT
DC_LIN_3V
5
3
4
6
1
2
OUT
VOUT
GND
VOS
VM
RFIN
VCC
U1204M11
U1204M11
TX_SWI
TXH_1
DC_LIN_3V
A2C1
C2
B1
A1
OUT
GND
VCC