DESCRIPTION

The M52761 is IF signal-processing IC for VCRs and TVs. It enable the PLL detection system despite size as small as that of conventional quasi-synchronous VIF/SIF detector, IF/RF AGC, SIF limiter, FM detector, QIF AGC and EQ AMP.

FEATURES

• Video detection output is 2VP-P. It has built-in EQ AMP.

• The video detector uses PLL for full synchronous detection circuit. It produces excellent characteristics of DG, DP, 920kHz beat, and cross color.

• Dynamic AGC realizes high speed response with double filter.

• Video IF and sound IF signal processings are separated from each other.

VCO output is used to obtain intercarrier.

This PLL-SPLIT method and built-in QIF AGC provide good sound sensitivity and reduces buzz.

• As AFT output voltage uses the APC output voltage, VCO coil is not used.

• Audio FM demodulation uses PLL system, so it has wide frequency range with no external parts and no adjustment.

• This IC corresponds to only NTSC system.

APPLICATION

TV sets, VCR tuners