Document
MITSUMI
RGB Encoder MM1268
RGB Encoder
Monolithic IC MM1268
Outline
This IC converts analog RGB signals into chroma, Y+S and composite video signals.
Features
1. Operates on 5V single power supply 2. Supports NTSC and PAL formats 3. Supports S (Y, C output) 4. 75Ω driver output (RGB output, Y, C output, composite video output) 5. Built-in BRF and delay circuits
Package
SOP-24A
Applications
1. PCs 2. Game equipment 3. Other video equipment
Equivalent Circuit Diagram
MITSUMI
RGB Encoder MM1268
Pin Description
Pin no. 1 2 3 4 Pin name GND1 RIN GIN BIN RGB input pins Maximum input voltage is 1VP-P DC level is 2V during clamp Function Internal equivalent circuit diagram
5 6
NC SCIN
OPEN Subcarrier input pin Input a 0.4V~5VP-P sine wave
7
NTSC/PAL
Mode setting pin NTSC : VCC PAL : GND
8
BFPOUT
Burst flag pulse monitor pin
MITSUMI
RGB Encoder MM1268
9
Yclp
Connects to capacitor for Y signal clamp
10
SYNCIN
Composite sync signal input pin
11 12 13
NC VCC1 Iref
OPEN Determines internal reference current Connect a 47kΩ resistor between this pin and ground
14
Vref
Internal reference voltage pin Reference voltage is 4V Connect a 10µF capacitor between this pin and ground.
MITSUMI
RGB Encoder MM1268
15 16
COUT YOUT
Chroma signal output pin Luminance signal output pin Able to drive 75Ω load
17
Ytrp
Connects to trap for removing subcarrier frequency component in VIDEO output luminance signal
18
f0
Determines filter and delay circuit f0 NTSC : 20k PAL : 16k
19 20
VCC2 VIDEO OUT
Output stage power supply Composite video signal output pin Able to drive 75Ω load
MITSUMI
RGB Encoder MM1268
21 22 23
BOUT GOUT ROUT
RGB signal output pin Able to drive 75Ω load
24
GND2
Output stage GND
Absolute Maximum Ratings
Item Storage temperature Operating temperature Power supply voltage Allowable loss
(Ta=25°C) Symbol TSTG TOPR VCC max. Pd Ratings -40~+125 -20~+75 +7 720 75.0 Units °C °C V mW 0.8mm garaepo board)
*1
Note : 1 Loss tolerance when garaepo board is mounted. (25.0
*
Recommended Operating Conditions
Item Operating temperature Operating voltage Symbol TOPR VOP Ratings -20~+75 4.75~5.25 Units °C °C
MITSUMI
RGB Encoder MM1268
Electrical Characteristics
Item
(Ta=25°C, VCC=1, 2=5V) Measurement conditions, SW conditions (S1, S2, S3, S4, S5, S6, S7) V4 : SG6 V5 : SG8 SW conditions (0, 0, 0, 0, 0, 0, 0) V1, 2, 3 : SG1 SW conditions (1, 1, 0, 0, 1, 1, 0) V1, 2, 3 : SG2/SG1 SW conditions (1, 1, 0, 0, 1, 1, 0)
Symbol
Measurement circuit
Min. Typ. Max. Units 31 17 40 22 mA mA
Consumption current 1 ICC1 Consumption current 2 ICC2 RGB output characteristics ROUT, GOUT, BOUT R output voltage VR F G output voltage VG E B output voltage VB D Rf characteristic fR F Gf characteristic fG E Bf characteristic fB D Brightness output characteristic YOUT, VIDEOOUT Sync level Y(S) Red brightness level Y(R) Green brightness level Y(G) B/C Blue brightness level Y(B) White brightness level Y(W) fY(R) Brightness f characteristic f.