JVC KD-SX8250 Service Manual page 36

KD-SX8250/KD-SX780
TA2157FN-X(IC501):RF amp
1.Terminal layout
2.Block diagram
13
14
15
16
17
18
19
20
21
22
23
24
PIN
VCTRLPIN
VCC
HiZ
GND
1-36
24 ~
1 ~
20k 20k
20k
15k
20k
50 A
20k
12k
12k
20k
BOTTOM
PEAK
20k
180k
40pF
3k
3k
SEL TEB
(APC SW) (TE BAL)
APC ON
-50%
APC ON
0%
APC OFF
+50%
(LDO=H)
13
12
PEAK
50k 15k
40k
20k
2k
50k
1k
14k 2k
1.75k
240k
15pF
x0.5
K
x2
240k
15pF
x0.5
1
x2
94k
60k
22k
60k
94k
22k
RFGC
(AGC Gian) (TE BAL)
Normal mode
+12dB
Normal mode
+6dB
CD-RW mode
0dB
12
11
10
9
8
7
6
5
4
3
2
1
TEB
(0dB)
(0dB)
(+12dB)