U2203B
RGB Video Amplifier System for Monitors
Description
The U2203B-A is a wideband video amplifier IC system
especially designed for use in high-resolution RGB moni-
tors. The IC includes three well matched video
amplifiers, three gated differential amplifiers for black-
level clamping and brightness control and the function for
simultaneously contrast control. Separate adjustment of
the maximum gain of each channel is also possible.
Features
D
3 channels, high bandwidth (90 MHz @ –3 dB)
D
Matched attenuators for contrast control
D
Black-level clamping for brightness control
Vs1
1
SUPPLY
REG.
1k
D
Independent gain control of each amplifier
D
ESD protection according to MIL-STD. 883
28 Vs1
CONTRAST CAP
2
27 R DRIVE
CONTRAST CAP
3
RED
40
90
26 R CLAMP (–)
R VIDEO IN
4
25 R VIDEO OUT
R CLAMP CAP
5
24 R CLAMP (+)
G VIDEO IN
6
GREEN
1k
40
23 Vs2
GROUND
7
90
22 G DRIVE
G CLAMP CAP
8
9
21 G CLAMP (–
)
B VIDEO IN
B CLAMP CAP
BLUE
1k
40
2.4V
REF
CONTRAST
CONTROL
90
20 G VIDEO OUT
10
19 G CLAMP (+)
Vin REF
CONTRAST
11
12
18 B DRIVE
17 B CLAMP (–)
Vs1
13
1.4V
REF
U2203B
95 10749
16 B VIDEO OUT
CLAMP GATE
14
15 B CLAMP (+)
Figure 1. Block diagram
TELEFUNKEN Semiconductors
Rev. A2, 27-Jan-97
1 (7)
TEMIC [ TEMIC SEMICONDUCTORS ]
