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MM1238

3-Input 2-Output 3-Circuit Video Switch

Mitsumi 

MITSUMI

3-Input 2-Output 3-Circuit Video Switch MM1238

3-Input 2-Output 3-Circuit Video Switch

Monolithic IC MM1238

July 5, 1993

Outline

This IC is a video switch IC developed for high-end large/medium TVs incorporating three 3-input 2-output

circuits. It is ideal for switching BS/JSB/CS or M-N converters (mute to NTSC conversion). The BS-CS

decoder can be used as a W decoder.

Features

1. One of the two video signal outputs is used for external output, and has a 6dB amp, 75Ω, 1VP-P

2. Input impedance

1~3 video circuits

15kΩ

1~3 audio circuits

68kΩ

3. Crosstalk

Video

-60dB (at 4.43MHz)

Audio

-80dB (at 1kHz)

Video : Audio

-70dB (at 100kHz)

4. Frequency response

10MHz (6dB, 75Ω, amp only, 7MHz)

5. Supply voltage

8.0~13.0V

Package

SDIP-22A (MM1238XD)

Applications

1. TV

2. Free-standing VCR

3. Other video equipment

Pin Assignment

22 21 20 19 18 17 16 15 14 13 12

Pin no.

1

2

3

4

5

6

7

8

9

10

11

Pin name

LIN1

VIN1

RIN1

C11

LIN2

VIN2

RIN2

C12

LIN3

VIN3

RIN3

1 2 3 4 5 6 7 8 9 10 11

SDIP-22P

Function

Audio LIN1

Video IN1

Audio RIN1

SW1 control

Audio LIN2

Video IN2

Audio RIN2

SW1 control

Audio LIN3

Video IN3

Audio RIN3

Pin no.

12

13

14

15

16

17

18

19

20

21

22

Pin name

C21

ROUT2

VOUT2

LOUT2

GND

C22

VCC

ROUT1

LOUT1

VOUT1

SAG

Function

SW2 control

Audio ROUT2

Video OUT2

Audio LOUT2

GND

SW2 control

Power supply

Audio ROUT1

Audio LOUT1

Video OUT1

Sag pin

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