la1136nm Sanyo Semiconductor Corporation, la1136nm Datasheet - Page 24

• Manufacturer Part Number: la1136nm
• Description: Am Tuners For Car Radios And Home Stereos
• Manufacturer: Sanyo Semiconductor Corporation

19. IF Count Buffer
Although this explanation is for the LA1137N, it is identical for the LA1136N, except that the pin numbers are different.
Circuit operations
Pin 13 serves as both the count buffer input pin and output pin. When the control voltage with no load is HIGH 5 V, the IF buffer
output is 300 mVrms and when LOW GND, 1 mVrms or lower. Supports Sanyo’s LM7000 and LC7230.
3 RF alignment coil
In general, the RF amplifier gain and fluctuations in the effective sensibility should be kept as low as possible.
Check the data in the diagram to determine the number of
turns.
Turns
proportional
to gain
LA1136N, 1136NM, 1137N, 1137NM
IF counter
amplifier
Reverse
IF buffer
circuit
Control
voltage
Maximum sensitivity MS
Increase turns
Effective sensitivity QS
Number of turns
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