TB1238N

The TB1238N is the IF & video processing IC for NTSC color TV system.This IC demodulates PAL/NTSC PIF,SIF and composite video signal to R/G/B primary colors and audio signals.TB1238N has the analog R/G/B interface,therefore it is easy to make up PIP system by using this IC.TB1238N has an I2C bus interface.Various controls can be done via two bus lines.

Features of the TB1238N are:(1)IF stage:intercarrier input,double time consatant IF AGC,bus controlled RF AGC,bus controlled PIF VCO,PLL SIF demodulation;(2)video stage:built-in vedio switch,built-in chroma trap,built-in Y delay line,black expansion,DL type sharpness control;(3)chroma stage:built-in 1 H DL,built-in BPF/TOF,Fsc continuous wave output;(4)text stage:fast blanking,analog R/G/B interface,cut-off/drive adjustment,ABCL;(5)deflection stage:resonator less H-VCO,dual horizontal AFC,horizontal AFC,horizontal phase control,vertical phase&amplitude control,H/V lock detection,stand castle pulse output,no vertical output mode;(6)audio stage:built-in audio switch,built-in audio attenuator.

The absolute maximum ratings of the TB1238N can be summarized as:(1):the characteristic is supply voltage(9V VCC),the symbol is VCCMAX,the rating is 12,the unit is V;(2):the characteristic is supply voltage(5V VCC),the symbol is VCCMAX,the rating is 8,the unit is V;(3):the characteristic is permissible loss,the symbol is PDMAX,the rating is 1980,the unit is mW;(4):the characteristic is input terminal voltage,the symbol is Vin,the rating is GND-0.3 to VCC+0.3,the unit is V;(5):the characteristic is operating temperature,the symbol is Topr,the rating is -20 to 65,the unit is ;(6):the characteristic is storage temperature,the symbol is Tstg,the rating is -55 to 150,the unit is .