Polaroid PLA-4200M, Service Manual

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PDP TV SERVICE MANUAL
(3) VPC323OD
PRELIMINARY DATA SHEET
Comb Filter Video Processor
Introduction
The VPC 3230D is a high-quality, single-chip video front-end, which is targeted for 4:3 and 16:9, 50/60-Hz and
100/120 Hz TV sets. It can be combined with other members of the DIGIT3000 IC family (such as DDP 331x) and/or
it can be used with 3rd-party products.
The main features of the VPC 3230D are
– high-performance adaptive 4H comb filter Y/C separator with adjustable vertical peaking
– multi-standard color decoder PAL/NTSC/SECAM including all substandards
– four CVBS, one S-VHS input, one CVBS output
– two RGB/YC
r
C
b
component inputs, one Fast Blank (FB) input
– integrated high-quality A/D converters and associated clamp and AGC circuits
– multi-standard sync processing
– linear horizontal scaling (0.25 ... 4), as well as non-linear horizontal scaling ‘Panoramavision’
– PAL+ preprocessing
– line-locked clock, data and sync, or 656-output interface
– peaking, contrast, brightness, color saturation and tint for RGB/YC
r
C
b
and CVBS/S-VHS
– high-quality soft mixer controlled by Fast Blank
– PIP processing for four picture sizes (1/4,1/9,1/16, or1/36 of normal size) with 8-bit resolution
– 15 predefined PIP display configurations and expert mode (fully programmable)
– control interface for external field memory
– I
2
C-bus interface
– one 20.25-MHz crystal, few external components
– 80-pin PQFP package
System Architecture
Fig.5 shows the block diagram of the video processor
Fig. 5: Block diagram of the VPC 3230D
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