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參數(shù)資料
| 型號(hào)： | SN761210 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | VIDEO-PROCESSING CIRCUIT |
| 中文描述： | 視頻處理電路 |
| 文件頁數(shù)： | 4/14頁 |
| 文件大?。?/td> | 178K |
| 代理商： | SN761210 |
SN761210
VIDEO-PROCESSING CIRCUIT
SOCS042 – JUNE 1994
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description
data in
Video data should be capacitively coupled into DATA IN.
sample and hold
A sample-and-hold pulse aligned to the video data should be applied to S/HD1.
correlated double sampling
The correlated-double-sampling pulse aligned to the output midlevel data should be applied to S/HP and S/HD2.
AGC section
For AGC with a maximum gain of 24 dB, AGCFIL should be set to 3 V and AGCMAX should be open (see
Figure 1). For AGC with a maximum gain of 11 dB, AGCMAX should be set to 0 V. A low-pass filter should be
placed between AGCOUT and AMPIN. A 0.1-
μ
F capacitor should be placed from AGCFB to GND. A line-clamp
pulse should be applied to HOBP.
0.5
2
AGCFIL Voltage – V
A
3.5
AGC GAIN CHANGE
vs
AGCFIL VOLTAGE
–6
26
–2.48 dB
23.8 dB
Figure 1
gamma-amplifier section
AGC and low-pass filtered video should be brought into AMPIN. A 5-V voltage on GAINSEL results in the
filter-compensation amplifier having a 6-dB gain; a 0-V voltage on GAINSEL results in the filter compensation
amplifier having a 0-dB gain. A voltage that is applied to AMPTUNE determines the gamma curve (see Figure 2).
A high-control voltage on CHD allows the low-pass filtered and gamma-corrected video signal to pass through
to AMPOUT. A low-control voltage on CHD causes the 2-V level used for dark reference to be output. This
dark-level output either improves the last dark-reference clamp performance or provides a black-level reference
for inserting text characters. The accuracy of the charge stored across the last coupling capacitor is improved
since the random noise present on the CCD output during the optical-black level is eliminated.
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