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February 1999

PRELIMINARY

ML6461

CCIR656 NTSC Video Encoder

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鈩?loads.

FEATURES

s

s

s

s

s

Closed Caption VBI encoder for line 21 and 284

Handles SAV/EAV codes for CCIR656 Video

Single clock input: 27MHz CCIR656, 24.54MHz Sq. Pix.

Color subcarrier correction for overlay applications

Onboard analog 7th-order reconstruction filters and

6dB drivers with differential gain/phase of 0.5%/0.5潞

Y, C, CV outputs drive both AC or DC coupled loads

Multiple 75鈩?line drivers for two composite outputs,

channel modulator, and S-Video

2-wire serial control bus, or selectable presets for stand-

alone operation

Handles Japanese NTSC signals

s

s

s

s

BLOCK DIAGRAM

7

DVCC1

YCRCB0

DGNDI

8

14

DVCC2

15

DGND2

10 BIT

YDAC

1

AVCC1

2

AGND1

25

AVCC2

24

AGND2

YOUT

21

YCRCB1

20

YCRCB2

LUMA

BLANKING

DELAY

COMPEN-

SATION

UP

SAMPLER

LUMA

RECONSTRUCTION

FILTER

(FIR)

19

YCRCB3

7th ORDER

ANALOG

FILTER

WITH

GROUP DELAY

EQUALIZATION

6dB

27

CVOUT

+

危

+

6dB

26

COUT

INPUT Y/C DEMUX & CLOCK GENERATOR

18

YCRCB4

6dB

28

17

YCRCB5

NEGATIVE

SYNC DAC

TIMING

GENERATOR

(SAV/EAV)

CLOSED

CAPTIONING

POSITIVE

SYNC DAC

REFERENCE

GENERATOR

13

YCRCB6

12

YCRCB7

7th ORDER

ANALOG

FILTER

WITH

GROUP DELAY

EQUALIZATION

11

CLK

16

VSYNC

9

HSYNC

10

FIELD

CHROMA

BLANKING

BURST

INSERTION

5

SCLK

COLOR

SPACE

CONVERTER

UP

SAMPLER

CHROMA

BANDLIMIT

FILTER

MULTIPLYING

ACCUMULATOR

CHROMA

RECONSTRUCTION

FILTER

(FIR)

UP

SAMPLER

CDAC

22

SDATA

23

PRESET1

SERIAL

INTERFACE

OVERLAY

INTERFACE

PHASE

ACCUMULATOR

SUBCARRIER

GENERATION

危

8

PRESET0

PHERR

4

3

6

1

next

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