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