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. 75
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
Measurement
Measurement conditions,
Item
Symbol
circuit
SW conditions
Min. Typ. Max. Units
(S1, S2, S3, S4, S5, S6, S7)
Consumption current 1
I
CC
1
V4 : SG6 V5 : SG8
31
40
mA
Consumption current 2
I
CC
2
SW conditions (0, 0, 0, 0, 0, 0, 0)
17
22
mA
RGB output characteristics R
OUT
, G
OUT
, B
OUT
R output voltage
VR
F
V1, 2, 3 : SG1
G output voltage
VG
E
SW conditions (1, 1, 0, 0, 1, 1, 0)
0.64 0.71 0.78 V
P-P
B output voltage
VB
D
Rf characteristic
fR
F
V1, 2, 3 : SG2/SG1
Gf characteristic
fG
E
SW conditions (1, 1, 0, 0, 1, 1, 0)
-3.0
dB
Bf characteristic
fB
D
Brightness output characteristic Y
OUT
, VIDEO
OUT
Sync level
Y(S)
0.26 0.29 0.33 V
P-P
Red brightness level
Y(R)
V1 : SG3 V2 : SG4 V3 : SG5
0.17 0.21 0.26
V
Green brightness level
Y(G)
B/C
V4 : SG6 V5 : SG8
0.35 0.42 0.49
V
Blue brightness level
Y(B)
SW conditions (1, 0, 0, 0, 0, 0, 0)
0.065 0.08 0.095
V
White brightness level
Y(W)
0.6
0.71 0.82
V
fY(R)
V1, 2, 3 : SG2/SG1
Brightness f characteristic
fY(G)
B/C
SW conditions (1, 1, 0, 0, 1, 1, 0)
-3.0
dB
fY(B)
Chroma output characteristic C
OUT
, VIDEO
OUT
NTSC
Burst level
CL(b)
0.2
0.25
0.3
V
P-P
Red level ratio
CL(R)
2.84 3.16 3.48
Red phase
CP(R)
V1 : SG3 V2 : SG4 V3 : SG5
94
104
114
deg
Green level ratio
CL(G)
A/C
V4 : SG6 V5 : SG8
2.65 2.95 3.25
Green phase
CP(G)
SW conditions (1, 0, 0, 0, 0, 0, 0)
231
241
251
deg
Blue level ratio
CL(B)
2.01 2.24 2.47
Blue phase
CP(B)
337
347
357
deg
PAL
Burst -1 level
CL(b1)
0.2
0.25
0.3
V
P-P
Burst -1 phase
CP(b1)
125
135
145
deg
Burst -2 level
CL(b2)
0.2
0.25
0.3
V
P-P
Burst -2 phase
CP(b2)
215
225
235
deg
Red-1 level ratio
CL(R1)
2.84 3.16 3.48
Red-1 phase
CP(R1)
94
104
114
deg
Red-2 level ratio
CL(R2)
V1 : SG3 V2 : SG4 V3 : SG5
2.84 3.16 3.48
Red-2 phase
CP(R2)
A/C
V4 : SG6 V5 : SG8
246
256
266
deg
Green -1 level ratio
CL(G1)
SW conditions (1, 0, 0, 1, 0, 0, 1)
2.65 2.95 3.25
Green -1 phase
CP(G1)
231
241
251
deg
Green -2 level ratio
CL(G2)
2.65 2.95 3.25
Green -2 phase
CP(G2)
109
119
129
deg
Blue -1 level ratio
CL(B1)
2.01 2.24 2.47
Blue -1 phase
CP(B1)
337
347
357
deg
Blue -2 level ratio
CL(B2)
2.01 2.24 2.47
Blue -2 phase
CP(B2)
3
13
23
deg
NTSC/PAL
Burst position
td
A/C
V1 : SG3 V2 : SG4 V3 : SG5 V4 : SG6
0.4
0.6
0.75
S
Burst width
tw
SW conditions (1, 0, 0, 1, 0, 0, 1)
2.5
2.75
3.2
S
Carrier lea
VL
A/C
V1~3 : no signal, V4 : SG6
20
mV
P-P
SW conditions (1, 0, 0, 1, 0, 0, 1)
Electrical Characteristics
(Ta=25C, V
CC
=1, 2=5V)
MITSUMI
RGB Encoder MM1268
Input conditions
Symbol
Signal
SG1
Sine wave, 1V
P-P
, f=200kHz
SG2
Sine wave, 1V
P-P
, f=5MHz
SG3
Color bar (100%) R signal
SG4
Color bar (100%) G signal
SG5
Color bar (100%) B signal
SG6
Sine wave, 0.5V
P-P
, f=3.58MHz
SG7
Sine wave, 0.5V
P-P
, f=4.43MHz
SG8
0.8V-2.0V, composite, sync signal
SG3
SG4
SG5
SG8
4.5
64
1V
0V
1V
0V
1V
0V
2V
0.8V
Measuring Circuit
SW conditions : (0,0,0,0,0,0,0) for the circuit illustrated below
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