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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)： | 5/14頁 |
| 文件大?。?/td> | 178K |
| 代理商： | SN761210 |
SN761210
VIDEO-PROCESSING CIRCUIT
SOCS042 – JUNE 1994
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
2
AMPIN Voltage – V
A
2.5
GAMMA CURVES
vs
AMPTUNE
2
2.5
4 V
2 V
1 V
0.5 V
>0 V
Figure 2
iris section
The iris function is implemented by forming a negative-feedback system between the SN761210 video
processor and a timing generator such as the TMC57751. IRIS is connected to the differential-amplifier output
when WINDOW is high. A window pulse from the TMC57751 or user-defined timing generator can provide
additional gating of the video signal (see Table 4 of the TMC57751 data sheet for the WINDOW modes). The
black level of IRIS is 2 V that represents the device’s operating point for the zero-input data level. The
differential-amplifier output is connected to the iris-amplifier positive input with the negative input connected to
an internal voltage-divider network between the 2-V operating point and CENTER. The default value (no
connection to CENTER) on the iris amplifier’s negative input is 2.21 V. The transfer function of the iris amplifier
is given by [A
V
* (V
POS
– V
NEG
)] + 2 with A
V
= 2.5 V/V. Its output drives IRISFIL; an external capacitor should
be connected from IRISFIL to GND. IRISFIL also connects to two internal comparators with a built-in hysteresis
of 0.16 V when WIDTH is left unconnected. Varying the voltage of WIDTH allows the hysteresis to increase or
decrease by 0.08 V (see Figure 3 and Figure 4). If the average value of the video on IRIS drops below [2.21
– (0.16/2)]V, LOB becomes active by going low and sinking current. If the average value of the video on IRIS
rises above [2.21 + (0.16/2)]V, HIB becomes active by going low and sinking current. HIB and LOB should be
connected to the TMC57751 EU and ED inputs respectively. An active-low input on EU causes the integration
time to increase resulting in an increase in the average video level. The default-operating points for the center
and width characteristics of the iris comparator can be modified. By applying control voltages to these terminals,
the iris function can be optimized for different imaging applications.
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