LA1780 データシートの表示（PDF） - SANYO -> Panasonic

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LA1780

Single-Chip Tuner IC for Car Radios

SANYO -> Panasonic 

LA1780M

Usage Notes

1. Notes on VCC and Ground

Pin 40

Pin 25

Pin 14

Pin 61

* Pin 6

Pin 3

VCC for the FM IF, AM, NC, MPX, and MRC blocks

Ground for the FM IF and AM blocks

Ground for the NC, MPX, and MRC blocks

VCC for the FM front end, AM first mixer, and first oscillator blocks

VCC 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

2. Notes on AM Coil Connection

The VCC 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. VCC 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 VCC

Pin 6 voltage

8

OPEN

Mode

FM

AM

4. Relationship between Pin 23 and Pin 26

• FM mode

Pin 26 functions as both the stereo indicator and the SD pin.

Pin 23: DC-input seek/stop pin (control pin)

AC output IF counter buffer pin

IF counter buffer

Between 0 and a few

thousand Ohms.

The Pin 23 Control Function and the Relationship between Pin 23 and Pin 26

SW1

OPEN

ON

—

SW2

OPEN

OPEN

ON

Pin 23 voltage

5V

2.5 V

Under 0.7 V

Pin 26

IF counter buffer on

OFF

OFF

Pin 26

SD

High-speed SD

Stereo indicator

No. 5724-20/38

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