Reference Voltage(V)
Reference Resistance(K
Ω
)
Pin Function
Without
With
Forward(
Ω
) Backward(
Ω
)
signal
signal
47 PIF and SIF composite signal
output
3.8 3.8 680
900
48 Intermediate frequency locked
phase loop filtering
4.7 4.7 800
2000
49 VCO and SIF grounding
0
0
0
0
50 Intermediate
frequency
VCO
8.1
8.1
550
1000
51 Intermediate
frequency
VCO
8.1
8.1
650
1000
52 VCO and SIF power supply
9.0
9.0
450
600
53 SIF signal input and horizontal
curve correction
4.5 4.5 820
2000
54 SIF smooth filtering
5.6
5.6
800
1300
55 External audio input
4.2
4.2
800
2000
56 FM DC negative feedback
3.5
3.5
800
2000
N901 TMP87CK38N
Reference Voltage(V)
Reference Resistance
Pin Function
Without
signal
With
signal
Forward(
Ω
) Backward(
Ω
)
1
Power supply grounding
0
0
0
0
2
Tuning voltage output
*
*
700
8000
3 Vacant
pin
5.0
5.0
700
8000
4
Mute
5.0
0 700 8000
5
External
mute
5.0
0 700 8000
6
Vacant
pin
0 0 700 8000
7
Standby power supply
2.0
2.0
700
8000
8 Vacant
pin
1~4.2
1~4.2
700
8000
9 Band
1
0~4.8
0~4.8
700
3500
10 Band
2
0~1.7
0~1.7
700
3000
11
Clock bus control
5.0
5.0
700
15000
12
Digit bus control
5.0
5.0
600
15000
13 AFC
input
2.3
2.3
700
3000
14 Karaoke
switch
0
0
600
10000
15
Keyboard matrix input
4.0
4.0
700
10000
16
Keyboard matrix input
4.0
4.0
680
10000
17 Vacant
pin
0
0
700
10000
18 Vacant
pin
0
0
700
10000
19 Vacant
pin
0
0
620
10000
20 Vacant
pin
0
0
620
10000
21 Grounding
0
0
0
0
22
Red primary color character
output
0 0 620 2200
Summary of Contents for 21F99
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