參數(shù)資料
型號: TMC22071A
廠商: Fairchild Semiconductor Corporation
英文描述: Genlocking Video Digitizer
中文描述: 同步鎖相視頻數(shù)字化儀
文件頁數(shù): 1/24頁
文件大?。?/td> 125K
代理商: TMC22071A
www.fairchildsemi.com
Features
Fully integrated acquisition
3-channel video input multiplexer
Two-stage video clamp
Automatic gain adjustment
Sync detection and separation
Pixel and subpixel adjustment of HSYNC-to-Video
timing
Genlock to NTSC or PAL inputs
Clock generation
8-bit video A/D converter
Microprocessor interface
Line-locked pixel rates
- 12.27 MHz NTSC
- 13.5 MHz NTSC or PAL
Direct interface to TMC22x9x encoders
Built-in circuitry for crystal oscillator
No tuning or external voltage reference required
68 Lead PLCC or 100 Lead MQFP package
Applications
Frame grabber
Digital VCR/VTR
Desktop video
Description
The TMC22071A Genlocking Video Digitizer converts stan-
dard baseband composite NTSC or PAL video into 8-bit dig-
ital composite video data. It extracts horizontal and vertical
sync signals and generates a pixel clock for the on-board
8-bit A/D converter and a 2x clock for the transfer of data to
subsequent video processing decoding or encoding with the
TMC22x5y Video Decoder or TMC22x9x Digital Video
Encoder family. It also measures the color subcarrier phase
and frequency and provides this data to the Encoder (for gen-
locked color NTSC or PAL encoding), or a frame buffer (for
frame capture) over the digital composite video port.
The TMC22071A includes a three-channel video input mul-
tiplexer, analog clamp, variable gain amplifier, and digital
back porch clamp. The on-board oscillator circuitry gener-
ates the clock from a 20 MHz crystal or the clock source may
be an external oscillator. It is programmable over a micro-
processor interface for NTSC or PAL operation. No external
component changes and no production tuning or service
adjustments are ever required.
The TMC22071A is fabricated in an advanced CMOS
process, and is packaged in a 68 Lead PLCC or 100 Lead
MQFP. Its performance is guaranteed from 0
°
C to 70
°
C.
Block Diagram
VIN1
ANALOG
CLAMP
GAIN
D/A
GVSYNC
GHSYNC
PXCK
LDV
VALID
65-22071-01
CVBS7-0
BACK PORCH
CLAMP
DATA
SELECTOR
SUBCARRIER
PHASE-LOCKED
LOOP
SYNC
SEPARATOR
HORIZONTAL
PHASE-LOCKED
LOOP
DIRECT
DIGITAL
SYNTHESIZER
LOWPASS
FILTER
D/A
+1.2V
R
D
A
C
R
I
C
C
C
O
D
O
P
P
E
C
V
R
R
CONTROL
MICROPROCESSOR
INTERFACE
ANALOG INTERFACE
DDS/PIXEL CLOCK INTERFACE
M
VIN2
VIN3
A/D
T MC22071A
Genloc king Video Digitizer
Rev. 1.0.5
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