LA1787M Datasheet, PDF (22/54 Pages) Sanyo Semicon Device – Single-Chip Tuner IC for Car Radios

LA1787M
Usage Notes
1. Notes on V_CC and Ground
Pin 40
Pin 25
V_CC for the FM IF, AM, NC, MPX, and MRC blocks
Ground for the FM IF and AM blocks
Pin 14 Ground for the NC, MPX, and MRC blocks
Pin 61
* Pin 6
Pin 3
V_CC for the FM front end, AM first mixer, and first oscillator blocks
V_CC for the FM front end and AGC blocks, and the AM/FM switching pin
Ground for the FM front end, first mixer, and first oscillator blocks
*: When applying the V_CC voltage to pin 6, that voltage must not exceed the pin 40 and pin 61 V_CC voltages.
(This condition must be checked carefully when first applying the pin 6 voltage.)
2. Notes on AM Coil Connection
The V_CC used for the first oscillator coil connected to pin 7 must be at the same potential as pin 61.
Connect to the IFT connected with pin 45, and to the MIX coil connected with pin 54. V_CC must be at the same potential
as pin 40.
3. AM/FM Switching
Pin 6 is also used as the FM front end and RF AGC V_CC
Pin 6 voltage
8
OPEN
Mode
FM
AM
Fig. 1
LA1787M Overview
1. Notes on the LA1781M, LA1784M, and LA1787M
The LA1784M is a version of the LA1781M that uses an external oscillator circuit, and has the same characteristics as
the LA1781M.
The LA1787M is a version of the LA1784M that features improved characteristics.
LA1781M
LA1784M
LA1787M
This product is a version of the LA1781M
with the oscillator circuit removed. It
supports the use of an external oscillator
circuit.
It has the same characteristics as the
LA1781M.
The LA1787M features improved
characteristics over the LA1781M
and LA1784M.
No. 6655-22/54