Motorola HT1250-LS+ - Making Phone Calls via Conventional Systems

5-18 Schematic Diagrams, Overlays, and Parts Lists
NC
INT_SPK-
EXT_SPK+
EXT_SPK-
OPT_B+
EXT_MIC
OPT_SEL_2
OPT_SEL_1
GND
RX_DATA
TX_DATA
GND
RSSI
NU
J403
RX_AUDIO/TX_AUDIO
INT_SPK+
20 PIN CONN
L400
BOOT_CTRL
GND
MIC
GND
GND
64
13
390nH
Q410
2
J403-14
J403-13
68
R450
10K
C450
R499
R498
10K
R431
470K
C476
10uF
470pF
C492
C495
470pF
0.1uF
C447
36K
R472
6.2K
R424
R423
82K
J403-3
J403-20
J403-19
J403-16
390nH
L401
C471
470pF
470pF
C484
J403-17
J403-7
J403-6
VR450
10.0V
J403-18
2K
R421
0.1uF
C442
C448
0.1uF
J403-1
VR434
6.8V
J403-12
10.0V
VR448VR447
10.0V
J403-11
470pF
C441
2K
R435
C496
470pF
C494
100pF
10
R473
470pF
C446
470pF
C483
C473
470pF
VR449
10.0V
J403-8
R436
0
C440
4.7uF
C491
470pF
0.1uF
C443
5.6V
VR433
5.6V
VR432
J403-9
R471
5.6K
18
OUT1POS
3
OUT2NEG
13
OUT2POS
8
SELECT
6
SVR
5
VCC1
20
VCC2
11
14
IN2POS
15
MODE
4
2
NC1
7
NC2
9
NC3
12
NC4
19
NC5
OUT1NEG
GND1
1
GND2
10
IN1NEG
17
IN1POS
16
IN2NEG
U420
TDA8547
C497
470pF
C472
470pF
470pF
C490
470pF
C445
J403-10
6.8V
VR460
100pF
C493
R434
330
J403-4
J403-5
J403-2
C444
100pF
1K
R477
C478
1000pF1000pF
C477
.01uF
C474
10uF
C475
J403-15
AUDIO
FLAT_RX_SND
BOOT_CTRL
UNSWB+
AUDIO_PA_ENA EXT_SPKR_SEL
5V
3.3V
INT_MIC
OPT_SEL2
EXT_MIC
SCI_RX
SCI_TX
SWB+
RSSI
OPT_SEL1
SWB+
Figure 5-16. 200 MHz Audio Power Amplifier Schematic Diagram