TB1238BN

The TB1238BN is a kind of IF & video processing IC for PAL/NTSC color TV system. The device demodulates PAL/NTSC PIF, SIF and compositive video signal to R/G/B primary colors and audio signals. The IC can consitute multi-color system by combined with TA1275AZ (SECAM processor). It has the analog R/G/B interface, therefore it is easy to make up PIP system by using this IC.

There are some features of TB1238BN as follows: (1)IF stage: intercarrier input, double time constant IF AGC, bus controlled RF AGC, bus controlled PIF VCO, L-SECAM demodulation and PLL SIF demodulation (for 4.5-6.5 MHz multi-SIF, thank coil-less); (2)video stage: built-in video switch (2 inputs/1 output), built-in chroma trap, built-in Y delay line, black expansion and DL type sharpness control; (3)text stage: fast blanking, analog R/G/B interface, analog R/G/B interface, cut-off/drive adjustment and ABCL; (4)deflection stage: resonator less H-VCO, dual horizontal AFC, horizontal phase control, vertical phase & amplitude control, H/V lock detection, sand castle pulse output (HD+VD+gate pulse) and no vertical output mode; (5)audio stage: built-in audio switch (2 inputs/1 output) and built-in audio attenuator.

The following is about the maximum ratings of TB1238BN (Ta=25): (1)supply voltage (9 V VCC), VCCmax9: 12 V; (2)supply voltage (5 V VCC), VCCmax5: 8 V; (3)power dissipation, PDmax: 1980 mW; (4)input thermal voltage, Vin: GND-0.3 to VCC+0.3 V; (5)operating temperature, Topr: -20 to 65; (6)storage temperature, Tstg: -55 to 150.