KA2139

KA2139 3 CHANNEL R.G.B VIDEO AMPLIFIER VIDEO AMPLIFIER FOR MONITOR 28-DIP-600A The KA2l39 is a monolithic integrated circuit for processing the R,G,B video in high resolution CRT display. It contains 3 channel video amplifier, black level clamp comparator for brightness control and DC control attenuator for contrast control, this device is suitable for monitor. FUNCTIONS R. G. B amplifier Contrast control Clamp & brIghtness circuit Vref. circuit FEATURES 3 Channel R.G.B video amplifier (f.-3DB =7OMHz:Typ) Superior linearity contrast control ORDERING INFORMATION Black level clamp comparator for Device Package Operating Temperature brightness control Built-in clamp gate circuit to operate the KA2139 28 DIP -20°C ~ +70°C clamp comparator at black level Vref 2.4V bandgap circuit BLOCK DIAGRAM 28 27 26 25 24 23 22 21 20 19 18 17 16 15 A2 A2 A2 A1 + RED gm GREEN A1 + - gm BLUE A1 + - gm CONTRAST CONTROL Vref 2.4V 1.4 V 1 2 3 4 5 6 7 8 9 10 11 12 13 14 KA2139 PIN DESCRIPTION No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Symbol VCC1 CONCAP1 CONCAP2 RIN RCAP GIN GND GCAP BIN BCAP VREF CON VCC1 GATEIN Description Power supply 1 Contrast capacitor 1 Contrast capacitor 2 R channel input R-CH comparator cap. G channel input Ground G-CH comparator cap. B channel input B-CH comparator cap. R,G,B amp. offset voltage Contrast control Power supply 1 Clamp gate input VIDEO AMPLIFIER FOR MONITOR No 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Symbol BCLAMP(...