Motorola CP040 - Page 353

UHF (438-470 MHz) Schematic Diagrams, Overlays, and Parts Lists (8486348Z09-A) 3-43
1.64 V (RX)
0.98 V (RX)
4.97 V (RX)
293 mV RF (RX)
+8 dBm
276 mV RF (TX)
+11.7 dBm
66.3 mV RF (RX)
-6.7 dB
m
2.5%
3.9pF
R280
4.7K
C285
0.1uF
C268
20%
NC
R282
C251
1K
TX: 3V
3.5V to 10V
4.5V
RX: 0V
390pF
C292
220nH
L270
L254
2%
12.5nH
L264
2%
12.5nH
390pF
C275
V_SF
C265
3.0%
3.3pF
NC
390pF
C283
1SV229
D262
220nH
L255
R261
22K
19
TRB_IN
TX_BASE
16
TX_EMITTER
15
TX_IADJ
1
TX_OUT
10
TX_SWITCH
13
VCC_BUFFERS
14
VCC_LOGIC
1817
GND_LOGIC
PRESC_OUT
12
RX_BASE
5
RX_EMITTER
6
RX_IADJ
2
RX_OUT
8
RX_SWITCH
7
SUPER_FLTR
3
50U54
U251
COLL_RFIN
4
FLIP_IN
20
GND_BUFFERS
11
GND_FLAG
9
L251
220nH
L283
NU
.01uF
C254
2%
5.1pF
C273
C255
0.1%
5.6pF
33
R263
C257
12pF
1%
SH251
SHIELD
1
390pF
C270
0.1%
2.4pF
C266
V_SF
220nH
L265
33
R253
100
R264
C252
390pF
33
R274
L252
27nH
C253
0.1%
5.6pF
R262
6.8K
390pF
C284
D261
C264
5%
2pF
C263
2.3%
4.3pF
R275
100
330
R273
1
3
2
R285
0
BFS540
Q280
D251
5.1K
R271
C281
390pF
C286
6.2pF
100
R254
6.8pF
C282
C276
3.3pF
C290
6.8pF
C271
18pF
C291
390pF NU
L271
5.6K
R272
SH253
SHIELD
11
C274
0.1uF
27nH
SH250
SHIELD
0.5pF
L262
C256
27nH
15nH
L292
15nH
L281
910
L282
R283
150
7.5pF
1.3%
C267
C272
0.1uF
R284
330
27nH
L276
0
R277
R276
8.2K
NU
220nH
R281
6.8nH
V_SF
L272
TX_INJ
L291
5R
VCO_MOD
PRESC
V
_STEER
RX_INJ
V_SF
3V
TRB
UHF2 (438-470 MHz) Voltage Controlled Oscillator Schematic Diagram PCB No. 8486348Z09-A