LA1787M Datasheet, PDF (46/54 Pages) Sanyo Semicon Device – Single-Chip Tuner IC for Car Radios

LA1787M
(AM)
This section investigates the gain in each block in the LA1787M when the Sanyo recommended circuits are used.
(Test conditions)
Ambient temperature: 26°C
Antenna and mixer input frequency: 1 MHz
First and second mixer input frequency: 10.7 MHz
Second IF input frequency: 450 kHz
The gains at each stage will be as follows.
RF Gain (ANT IN-pin62): 17 dB
1st MIX Gain (pin62-pin56): 8 dB
1st IF Gain (pin55-pin53): 15 dB
AM
RF
1st MIX
1st IF
2nd MIX
2nd IF
AM DET
RF
Gain
1st MIX
Gain
1st IF
Gain
2nd MIX
Gain
Fig. 55
2nd IF
Gain
A11774
No. 6655-46/54