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TC90A49P データシート(PDF) 6 Page - Toshiba Semiconductor |
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TC90A49P データシート(HTML) 6 Page - Toshiba Semiconductor |
6 / 17 page 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. |
同様の部品番号 - TC90A49P |
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同様の説明 - TC90A49P |
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