Ntsc/Pal Digital Video Encoder (Cs4955) - Akai DV-P3470S Service Manual

2-1-2 NTSC/PAL Digital Video Encoder (CS4955)

FEATURES
• Six DACs providing simultaneous composite, S-video,
and RGB or Component YUV outputs
• Programmable DAC output currents for low
imped-ance(37.5Ω) 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
• Porgrammable HSYNC and VSYNC timing
• Multistandard Teletext(Europe, NABTS, WST)
DESCRIPTION
The CS4955 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 27MHz 8-bit YUV, 8-bit YcbCr, or
ITUR.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-ralated
modulation components within the specified bandwidth of any of the supported video standards.
Parallel or high-speed I
parallel interface doubles as a general purpose I/O port when the CS4954 is in I
board area.
6
2
C compatible conpatible control interfaces are provided for flexibility in system design. The
support
• VBI encoding support
• Wide-Screen Signaling (WSS) support,
EIA-JCPX1204)
• NTSC closed caption encoder with interrupt
• CS4955 supports Macrovision copy protection
Version 7
• Host interface configurable for parallel or I
compatible operation
• On-chip voltage reference generator
• +.3.3V or +5V operation, CMOS, low-power modes,
tri-state DACs
Ordering Information
CS4955-CQ 48-pin TQFP
2
C mode to help conserve valuable
2
C