Motorola PRO Elite Serie Manual De Servicio página 115

Tarjeta de circuito de UHF banda 2, esquemas eléctricos y lista de partes
-51.4dBm@45.1MHz
-55.1dBm@45.1MHz
FL301
XTAL
TBD
C323
L311
150pF
750nH
6 3
IF IN OUT
C324
20pF
L331
2.20uH
Vdd_FILTERED
C382
(SOURCE) 10uF
C344
0.1uF
C329
0.1uF
C342
1uF
C341
1uF
C340
1uF
C339
1uF
C356
Vdd_FILTERED
.022uF
C337
L314
100pF
2.2uH
C336
0.1uF
R5
R314
3K
C326 R313 C328
.01uF 330 0.1uF
C327
2.683V
100pF
R311
30K
C330
10pF
R312
C325
R351
2.4K
.01uF Q302
0
R352
3.3K
R315
L330
12K
680nH
0.706V
R343
10
Vdda
C348 C347
C346
0.1uF 0.1uF
0.1uF
C343
0.22uF
C357
0.22uF
C358
1200pF
37
C359
C4P
38
0.1uF
C3P MLPD_CR
24
39
C2P BRP_OFF
23
40
C1P BROWN_VCC
22
41
GREEN_VCC FREF
42 21
MIX_BYP GND
43 20
U301
LVZIF_SEL
GREEN_VSS CEX
32D83 19
44
BLUE_VSS CLK CLK
45 18
BLUE_VCC DATA
46 17
MIX_IN TESTA
16
47
PREAMP_OUT IOUT
15
48
PRE_AGC GOLD_VSS
14
COL
13
C355
0.33uF
C338
15pF
RSSI
DA
C360
.022uF
SH323
SHIELD
C361
10nF
1
CRYSTAL FILTER SHIELD
Figura 8-5. Diagrama esquemático de la etapa de salida del receptor de UHF banda 2
DEMOD
R350
C345
100K
0.1uF
C390
100pF
DB
R344
12K
3.185V
C383 3
100pF
C352
Vdd_FILTERED
12pF
2
C349
.022uF
C351
20pF
C334
.022uF
16.8MHz
C350
330pF
DATA
C362
.022uF
SH321 SH322
SHIELD SHIELD
1 1
LVZIF TOP SHIELD LVZIF BTM SHIELD
8-5
R345
R355
10K
0
2.628V
Q320
C384
BFQ67W
56pF
1
C353
2.095V
43pF
R346
56K
C385
L332
56pF
C354 100nH
R324
47pF
2K
L325
2.20uH
R320 CR310
1K
R321 C364
R322
2.4K .01uF
200K
C363
2.2uF