LA1193M_08 SANYO [Sanyo Semicon Device], LA1193M_08 Datasheet - Page 8

• Manufacturer Part Number: LA1193M_08
• Description: High-Performance FM Front End
• Manufacturer: SANYO [Sanyo Semicon Device]

Continued from preceding page.
1. Oscillator Circuit
2. Local Oscillator Buffer Output
Pin No.
17
20
IF, AGC, V CC
Keyed AGC input
Function
Steps were taken to prevent AMR degradation during earlier product type
AGC operation, since the local oscillator block in this IC has independent
Vd (pin 5) and ground (pin 3) connections.
This is a Colpitts oscillator and has the same structure as that used in
earlier circuits. The oscillation level and intensity are changed by
capacitors C 2-4 , C 4 and C P .
This buffer is an emitter follower circuit.
If desired, the buffer efficiency can be increased by inserting a resistor
between pin 1 and ground to pass more current through the buffer
transistor. However, this current must be limited so that Pdmax for the
package is not exceeded.
LA1193M, 1193V
Equivalent circuit
Controls the narrow AGC.
Note
No.4715-8/22