LA1145, 1145M
LA1145 Pin Functions (2)
Pin No.
Function
Internal Equivalent Circuit
Notes
IF input via the phase shift circuit. The mute
circuit malfunctions and demodulation output
decreases if the voltage level at this pin
drops below 180 mV.
10
IF input
11
12
Vref
4.8 V
V
Supply voltage 7.5 to 14 V
CC
13
IF buffer output
14
15
GND
FM detection circuit GND
Amount of mute attenuation depends on and
is controlled by the voltage at this pin.
Mute driver
16
S-meter output
PNP open collector output
17
18
SD sensitivity setting
Can be used for S-meter output
SD output
High active
No. 2725-8/17