THC7984_Rev.1.00_E
THC7984
10-bit 3-channel Video Signal Digitizer
General Description
The THC7984 integrates all the functions to digitize
analog video signals on a single chip.
Features
170 MSPS 10-bit ADC
- Internal 14-bit ADCs
- Oversampling functions (2x, 4x, and 8x)
Line-locked PLL with low jitter
- Phase adjustment: 64 steps
Fine clamp / preamp
- Pedestal / center clamp
- Clamp level auto adjust
- Very low gain mismatch
- Gain adjustment: 2048 steps
Video Filter (LPF)
- Bandwidth adjustment: 28 steps (6MHz - 310MHz)
Sync Processor
- 2-level / 3-level sync slicer
- Advanced sync detection / measurement
- Automatic sync processing mode
- IRQ Output
2-wire serial interface
TQFP 80-pin package
Acceptable Signals
PC Graphics (RGB) : VGA-UXGA
- Separate Sync
- Composite Sync
- Sync on Green
Component Video (YPbPr) :
- SDTV (480i / 480p) 2-level Sync
- HDTV (1080i / 720p / 1080p) 3-level Sync
- Protection Signal
Applications
LCD TV / PDP TV
Rear-Projection TV
LCD Display / PDP Display
Front Projector etc.
Block Diagram
Auto Clamp
Level Adjust
RAIN0
RAIN1
2:1
Switch
Decimation
10-bit
Filter
Clamp
PGA
LPF
ADC
&
Output
Auto Clamp
Level Adjust
GAIN0
GAIN1
2:1
Switch
Formatter
10-bit
Clamp
PGA
LPF
ADC
GREEN0-9
RED0-9
Auto Clamp
Level Adjust
BAIN0
BAIN1
2:1
Switch
10-bit
Clamp
PGA
LPF
ADC
BLUE0-9
SOGIN0
SOGIN1
HSYNC0
HSYNC1
VSYNC0
VSYNC1
EXTCLK/COAST
CLAMP
FILT
SOG
Slicer
SYNC
Processing
&
Clock
Generation
DATACK
SOGOUT
O/E FIELD
HSOUT
VSOUT/A0
REFHI
Serial I/F
Control
Voltage
Reference
REFCM
REFLO
SCL
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