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ML6460CS Datasheet

  • ML6460CS

  • NTSC Video Encoder with Macrovision

  • 30頁

  • MICRO-LINEAR

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February 1999
PRELIMINARY
ML6460
CCIR656 NTSC Video Encoder with Macrovision
廬
GENERAL DESCRIPTION
The ML6460 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 ML6460 accepts 8-bit YCrCb video in either CCIR656
or Square Pixel format and generates analog Y, C and CV
waveforms complete with Macrovision廬 copy protection
technology and Closed Caption encoding.
The ML6460 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 ML6460 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
s
Macrovision廬 copy protection technology
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
13
YCRCB6
12
YCRCB7
TIMING
GENERATOR
(SAV/EAV)
MACROVISION廬 COPY PROTECTION
TECHNOLOGY
CLOSED
CAPTIONING
NEGATIVE
SYNC DAC
POSITIVE
SYNC DAC
REFERENCE
GENERATOR
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

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