MITSUI MTV-DV05, Руководство по обслуживанию

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SERVICE MANUAL
CS4955
Video Encoder
1. Features
●
Six DACs providing simultaneous
composite, S-Video, and RGB or Component
YUV outputs
● Programmable DAC output currents for low
impedance (37.5
Ω
) and high impedance
(150
Ω
) loads.
●
Multi-standard support for NTSC-M,
NTSC-JAPAN, PAL (B, D, G, H, I, M, N,
Combination N)
● ITU R.BT656 input mode supporting
EAV/SAV codes and CCIR601 Master/Slave
input modes
● Programmable HSYNC and VSYNC timing
Multistandard Teletext (Europe, NABTS,
WST) support
●
VBI encoding support
●
Wide-Screen Signaling (WSS) support, EIA-J
CPX1204
● NTSC closed caption encoder with interrupt
●
CS4955 supports Macrovision copy
protection Version 7
●
Host interface configurable for parallel or I
2
C
compatible operation
● On-chip voltage reference generator
● +3.3 V or +5V operation CMOS. low-power
modes, tri-state DACs
2. Description
The CS4954/5 provides full conversion from digital
video formats YCbCr or YUV into NTSC and PAL
Composite, Y/C (S-Video) and RGB, or YUV analog
video. Input formats can be 27 MHz 8-bit YUV, 8-bit
YCbCr, or ITU R.BT656 with support for EAV/SAV
codes. Video output can be formatted to be
compatible with NTSC-M, NTSC-J, PAL-B, D, G, H, I,
M, N, and combination N systems. Closed Caption is
supported in NTSC. Teletext is supported for NTSC
and PAL.
Six 10-bit DACs provide two channels for an S-Video
output port, one or two composite video outputs, and
three RGB or YUV outputs. Two-times oversampling
reduces the output filter requirements and
guarantees no DAC-related modulation components
within the specified bandwidth of any of the
supported video standards.
Parallel or high-speed I
2
C compatible control
interfaces are provided for flexibility in system
design. The parallel interface doubles as a general
purpose I/O port when the CS4954/5 is in I
2
C mode
to help conserve valuable board area.
Package:
CS4954CQ/CS4955CQ 48-Pin TQFP
3. Block Diagram
Fig. 1 9
60