Pin Function (cont)
Pin Pin Name
7 VCO F/B
VCO Feedback terminal.
The feedback control is to keep the internal
VCO of the uniform free-running frequency.
This terminal has dual function, connecting
to gnd select mode with VIF/SIF defeat.
To Defeat SW
8 SIF in
RF AGC Delay terminal. 4.5 MHz SIF
signal “LIM IN” is input at this pin which has
The RF AGC Delay Point is set up of DC
component of this signal. AC component is
Regulated voltage output terminal.
The voltage is approximately 3 V.
10 SIF out
SIF output terminal. FM signal which is
converted to 4.5 MHz is output. This pin
has dual function of being VIF VCO type
selection terminal. Connect to GND with
1.5 kΩ; JPN “58.75 MHz”
No connect; USA “45.75 MHz”
11 Audio out Sound output terminal.
De-emphasis is achieved by external
AF Bypass terminal. It is connected to one 4
of the input of a differential amplifier,
external capacitor provides AC filtering.
When resistor is connected in series with
capacitor, it is possible to lower the
amplitude of the audio output.
when audio output terminal is not use,
please connect this terminal to GND.
Rev.1.00, Aug.25.2003, page 5 of 19