SA1787 Datasheet, PDF (14/19 Pages) Silan Microelectronics Joint-stock – SINGLE-CHIP TUNER IC FOR CAR RADIOS

AM stereo system pins is shown in Figure 8
VCC
IFT
45
SA1787
GND
To the AM stereo decoder
400mV rms
450kHz output
39
VCC
IF AMP
50pF
150
Keyed AGC
Figure 8
AM low band cut adjustment method
The AM low band frequency characteristics can be adjusted with C42, which is inserted between pin 42 and VCC.
Since the detector is designed with VCC as the reference, C42 must be connected to VCC, shown in figure 9.
Figure 9
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0
2008.08.29
Page 14 of 19