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ML6461CS Datasheet(PDF) 1 Page - Micro Linear Corporation |
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ML6461CS Datasheet(HTML) 1 Page - Micro Linear Corporation |
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1 / 30 page  1 GENERAL DESCRIPTION The ML6461 is a multi-standard CCIR656 (4:2:2) video (input) composite and S-video (outputs) encoder for NTSC systems. It is designed to provide a low cost, single-chip output interface for a variety of video applications including set-top decoders, DVD players, and other YCrCb to Y/C equipment. The ML6461 accepts 8-bit YCrCb video in either CCIR656 or Square Pixel format and generates analog Y, C and CV waveforms complete with Closed Caption encoding. The ML6461 includes output analog reconstruction filters, phase equalizer, and 6dB (2X gain) drivers. Gain scaling, sync, and Y+C mixing are performed at the output of the relevant 10-bit DAC, eliminating the gain mapping stages that require additional DAC bits. The result is Y SNR and granularity remain precisely the same as the source. The ML6461 supports both master and slave timing operations. S-Video and multiple composite signals can be driven simultaneously into 75 Ω loads. BLOCK DIAGRAM FEATURES s Closed Caption VBI encoder for line 21 and 284 s Handles SAV/EAV codes for CCIR656 Video s Single clock input: 27MHz CCIR656, 24.54MHz Sq. Pix. s Color subcarrier correction for overlay applications s Onboard analog 7th-order reconstruction filters and 6dB drivers with differential gain/phase of 0.5%/0.5º s Y, C, CV outputs drive both AC or DC coupled loads s Multiple 75 Ω line drivers for two composite outputs, channel modulator, and S-Video s 2-wire serial control bus, or selectable presets for stand- alone operation s Handles Japanese NTSC signals February 1999 PRELIMINARY ML6461 CCIR656 NTSC Video Encoder YCRCB0 21 YCRCB1 20 YCRCB2 19 YCRCB3 18 YCRCB4 17 YCRCB5 13 YCRCB6 12 HSYNC 10 SCLK 22 SDATA 23 YCRCB7 11 7 DVCC1 8 DGNDI 15 DGND2 PRESET1 5 FIELD PHERR 14 DVCC2 2 AGND1 1 AVCC1 24 AGND2 25 AVCC2 VSYNC 9 YOUT 27 CVOUT 26 6dB 6dB DELAY COMPEN- SATION LUMA BLANKING TIMING GENERATOR (SAV/EAV) BURST INSERTION COLOR SPACE CONVERTER CHROMA BANDLIMIT FILTER CHROMA BLANKING PHASE ACCUMULATOR SUBCARRIER GENERATION LUMA RECONSTRUCTION FILTER (FIR) 10 BIT UP SAMPLER UP SAMPLER REFERENCE GENERATOR CHROMA RECONSTRUCTION FILTER (FIR) YDAC Σ + Σ + CDAC 7th ORDER ANALOG FILTER WITH GROUP DELAY EQUALIZATION 7th ORDER ANALOG FILTER WITH GROUP DELAY EQUALIZATION MULTIPLYING ACCUMULATOR NEGATIVE SYNC DAC POSITIVE SYNC DAC 6dB COUT 28 8 4 PRESET0 3 6 OVERLAY INTERFACE SERIAL INTERFACE 16 CLK CLOSED CAPTIONING |
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