SA1787 Datasheet, PDF (10/19 Pages) Silan Microelectronics Joint-stock – SINGLE-CHIP TUNER IC FOR CAR RADIOS

SA1787
Pin No.
52
Pin Name
AM IF IN
AM/FM
53
IF OUT
AM/FM
56
IF IN
54
Mixer OUT
49
Mixer IN
W-AGC
55
SD ADJ
N-AGC
58
Mute ADJ
59，60
61
Mixer OUT
F.E.VCC
62
1st MIX IN
63，64
Mixer IN
I/O
Descriptions
AM 450kHz AMP input
I
input impedance=2 kΩ.
AM/FM 10.7M first IF AMP output.
O
Output impedance=330Ω
V53=5.3V
AM/FM 10.7M first IF AMP input
I
Input impedance = 330Ω
V56=2.0V
AM 2nd Mixer OUT (The coil of pin 54 must be connected to the
O
pin40)
I
AM 2nd Mixer IN (The pin 49 mixer input impedance is 330Ω)
Include built-in DC cut capacitors.
Determination of the AGC on level is by the values of the capacitors
attached to this pin
I/O
In AM mode, pin55 is SD sensitivity adjustment pin by comparing V55
with the S-meter voltage
V55 = R55*50uA
Include built-in DC cut capacitors.
I/O
Determination of the AGC on level is by the values of the capacitors
attached to this pin
O
AM/FM 1st mixer output
I/O ^{VCC for front end}
AM first mixer input
I
The input impedance=10 kΩ.
AM/FM 1st mixer input.
This is an emitter insertion type input circuit, and the amount of
I
insertion is determined by the capacitors C63 and C64.
(The lines for pins 63 and 64 must be kept separated from the lines for
pins 59 and 60)
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0
2008.08.29
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