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参数资料
| 型号： | TC90A49F |
| 元件分类： | 信号分离 |
| 英文描述： | Y/C SEPARATOR IC, PDSO24 |
| 封装： | 0.450 INCH, 1.27 MM PITCH, PLASTIC, SOP-24 |
| 文件页数： | 14/17页 |
| 文件大小： | 497K |
| 代理商： | TC90A49F |
TC90A49P/F
2001-03-06 6/17
FUNCTION DESCRIPTION (Pin no. in this section refers to DIP package pin no.)
1.
AD converter (ADC)
High-speed 8-bit AD converter. The input dynamic range is 1.3 Vp-p (max) = 256 steps. They recommends
input of video signals of 1.0 Vp-p (from sync tip level to 100% white level).
2.
Clamp circuit
Performs sync tip clamp of the input video signal. The clamp level is determined internally to use the ADC
dynamic range efficiently.
3.
Line memory
Incorporates DRAM-resident, four 1-H delay circuits. Combination of delay circuits and delay times are
determined according to the signal format selected by the I2C bus.
TV Format
NTSC
PAL
N-PAL
M-PAL
Delay Amount (clock)
910
1135
917
909
4.
Band pass filter (BPF)
Extracts the chrominance signal from the line-memory-delayed composite video signal. The same filter is used
by NTSC, PAL, M-PAL, and N-PAL formats. The center frequency is fsc. The characteristics differ depending
on the TV format. BPFs are provided for both input and output sides of the dynamic comb filter. The input side
can be set to a wide band. The output side can be set to either a wide or a narrow band using the I2C bus
control.
5.
Dynamic comb filter (DCF)
Using Toshiba's original decision logic, detects a correlation of the three consecutive vertical lines for NTSC,
every other three lines for PAL, and extracts the chrominance signal accordingly.
6.
Vertical edge enhancement circuit
Generates edge components in proportion to the luminance differential signal of the three consecutive vertical
lines and adds the components to the luminance signal output. There are eight enhancement levels selected by
the I2C bus. The coring circuit eliminates differential signals caused by noise ; thus, increase in noise due to
edge enhancement is reduced. Signals lower than the pedestal level due to the addition of the edge
enhancement signal may be generated ; however, such signals are eliminated by the pedestal clip circuit at a
later stage. Therefore, there is no adverse effect on the sync processor circuit. The coring circuit regards small
edge components as noise and does not perform enhancement.
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PDF描述 |
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| TC90A58F | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC90A49P | 制造商:Panasonic Industrial Company 功能描述:IC |
| TC90A53F | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:3-LINE DIGITAL Y / C SEPARATOR IC |
| TC90A53N | 制造商:Panasonic Industrial Company 功能描述:IC |
| TC90A58F | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:3-Channel AD Converter |
| TC90A60U | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:DATA SLICE IC FOR VIDEO MULTIPLEX BROADCAST RECEIVER |
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