LA1145, 1145M
LA1145 Pin Functions (1)
Pin No.
Function
Internal Equivalent Circuit
Notes
1
IF input
2
Bias pin
IF limiting amp
GND
3
4
GND
Soft mute start point
control
For setting the soft mute starting point.
Can be used for S-meter output.
For setting the mute gradient from the soft
mute starting point to the noise finishing
point.
Soft muting gradient
control pin
5
6
For setting amount of mute attenuation.
The demodulation level changes when the
external resistance value is varied.
Mute Att
7
8
9
FM-AF output
AFC input
IF output
Output to the phase circuit
No. 2725-7/17