U2203B

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 monitors. The IC includes three well matched video amplifiers, three gated differential amplifiers for blacklevel 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) U2203B Pin Description VS1 Ccontr Ccontr Vin, R Cclamp, R Vin, G GND Cclamp, G Vin, B Cclamp, B VBias Vcontr VS1 VGate 1 2 3 4 5 6 7 8 9 10 11 12 13 14 96 12388 28 VS1 27 RR 26 VR– 25 Vout, R 24 VR+ 23 VS2 22 RG 21 VG– 20 Vout, G 19 18 17 16 15 VG...