XOCECO LC-32U26, Service Manual

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2. M52760SP
The M52760SP 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 and EQ AMP.
FEATURES
•Video detection output is 2VP-P. It has built-in EQ AMP.
•The package is a 20-pin shrink-DIP, suitable for space saving.
•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 only single filter.
•Video IF and sound IF signal processings are separated from each other. VCO output is used to
obtain intercarrier. This PLL-SPLIT method 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.
•QIF AMP has a fixed gain, and good characteristic for NICAM.
2: AFT
3: AGC
4, 5: picture If input
7: sound IF input
13: SIF output
10: mono sound output
18: TV- VIDEO output
14, 17: +5V-1 power supply