MITSMI MM1327 Datasheet

MITSUMI

Wide Discriminator MM1327

Wide Discriminator

Monolithic IC MM1327

Outline

This IC identifies the letter box portion of wide broadcast, etc. video signals. The luminance and chroma
signals are used so that the rate of identification on dark screens is increased. Output is the total of 6bit ADC
data and character signal, etc. white peak signal discriminator bit, for 7bit data output.
In addition, an EDTV2 simple discrimination function is built-in.

Features

1. Signal level discrimination using composite luminance and chroma signal

2. Discrimination of video signal within horizontal scanning interval can be done every scan due to integrated
output

3. Built-in white peak detection circuit for subtitles

4. Built-in EDTV2 simple discrimination function

5. 22H discrimination output (COMB-THROUGH) circuit built-in

6. Built-in window limiter circuit

7. Data output is 7bit serial output format : 6bit ADC + peak detection

8. Operates on +5V single power supply

Package

SDIP-30

Applications

Wide TV

MITSUMI

SDIP-30

13 6

10

24587129

11 151413

30 24 2127 25 23 22 2026 161729 28 1819

Block Diagram

Wide Discriminator MM1327

Pin Assignment

1 I 16 ADCLK
2 Q 17 NRZCLK
3 Y 18 DATA
4 AGND 19 EDTV2
5 MAX 20 VDO
6 VCOM 21 COMB
7 ZR 22 LIMIT
8 INT IN 23 COMB

9 INT OUT 24 NTSC/PAL
10 S/H 25 IR
11 DA 26 DELAY
12 DGND 27
13 HD 28
14 VD 29 GC
15 GP 30 V

SEPA-LEVEL

LIMIT-LEVEL

CC

-

-

-

TH

SW

SW

MITSUMI

Wide Discriminator MM1327

Pin Description

Pin no. Pin name Function Internal equivalent circuit diagram

1 I Video signal input pin
2 Q
3 Y

4 AGND

12 DGND

5 MAX

Composite output of input
video signal maximum
value

6 VCOM

7 ZR

8 INT IN

Internal reference voltage
output
Connect 1µF between this
pin and GND.

Connection pin for MAX
output clamp capacitor

Integrated circuit input pin

Integrated reset done at GP
timing.

MITSUMI

Wide Discriminator MM1327

Pin no. Pin name Function Internal equivalent circuit diagram

9 INT OUT

10 S/H

11 DA

13 HD

--------------------------------------

IN

15 GP IN

Integrated output pin and
sample and hold pins

S/H of integration results
at HD timing

DAC output for consecutive
comparison ADC

Timing pulse input pins
GP operates even on SCP

14 VD IN

16 ADCLK

input (5V

P

-

P).

Timing pulse input pin
VD operates even on SCP
input (5V

P

-

P).

Clock input pin for
consecutive ADC