Figure 5-30. 700 Mhz Audio Power Amplifier Schematic Diagram - Motorola HT1250-LS+ Service Manual

-36
5
C475
10uF
R423
470K
U420
R499 TDA8547
10K
C447
R472
.022uF 16
36K IN1POS
17
AUDIO
IN1NEG
R498
15
IN2POS
14
R431
IN2NEG
10K
470K
C448
0.1uF R424
36K
6
SELECT
4
MODE
5
SVR
C476
10uF
SWB+
C450
NU
6 4
1 2
AUDIO_PA_ENA

Figure 5-30. 700 MHz Audio Power Amplifier Schematic Diagram

UNSWB+
R473
10
C442
0.1uF
20 11
3
OUT1POS
18
OUT1NEG
8
OUT2POS
13
OUT2NEG
2
NC1
7
NC2 C443
9
0.1uF
NC3
12
NC4 EXT_MIC
19
NC5
R434
330
5V
R471
5.6K
R436
1K
Vdda
Q410
3
EXT_SPKR_SEL
OPT_SEL2
L401
390nH
C445
100pF
R435
2K
SCI_RX
C438
C444
2.2uF
100pF
SCI_TX
R421 L400
2K 390nH
RSSI
FLAT_RX_SND
C440
C441
2.2uF
100pF
BOOT_CTRL
INT_MIC
VR432
C497
100pF
SWB+
OPT_SEL1
R450
68
C471
100pF
C472
100pF C473
100pF
R477
1K
VR433
VR450 C493
100pF
C496
100pF
C495
100pF C494
100pF
Schematic Diagrams, Overlays, and Parts Lists
VR449
VR445 VR446 VR447 VR448
J403
20 PIN CONN
J403-1
GND
INT_SPK+
J403-2
J403-3 INT_SPK-
J403-4
EXT_SPK+
J403-5
EXT_SPK-
J403-6
OPT_B+
J403-7 EXT_MIC
OPT_SEL_2
J403-8
OPT_SEL_1
J403-9
GND
J403-10
J403-11
RX_DATA
J403-12
TX_DATA
J403-13
GND
J403-14
RSSI
RX_AUDIO/TX_AUDIO
J403-15
BOOT_CTRL
J403-16
J403-17 NC
J403-18 MIC
GND
J403-19
VR434
J403-20 GND
VR460
C490
100pF
C492
100pF
C491
100pF