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參數(shù)資料
| 型號： | LA7265W |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Single-Chip Black and White CCD Camera Signal Processing IC(單片黑白CCD照相機信號處理芯片) |
| 中文描述： | 單芯片黑白CCD攝像機信號處理集成電路（單片黑白防治荒漠化公約照相機信號處理芯片） |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 355K |
| 代理商： | LA7265W |
Continued from preceding page.
Unit (resistance:
), I: input, O: output, B: I/O, P: power supply
Function
No. 4850-13/24
LA7265W
Continued on next page.
Pin No.
Symbol
I/O
Equivalent circuit
16
17
18
19
20
PED. CLIP
Y. GAIN
VIDEO-V
CC
2
AP. DARK. SL
AP. CLIP
I
I
P
I
I
S-curve gamma control. This pin is normally left open when the
variable
γ
circuit is used. However, S-curve
γ
correction can be
enabled by clipping near the pedestal level by applying 5 V to this pin.
Y signal gain control. The signal that has passed through one of the
γ
correction circuits goes to the Y gain control amplifier. This pin
adjusts the amount of amplification, which determines the amplitude
of the final output. This pin is normally left open when the
γ
= 0.45 or
the
γ
= 1 circuits are used. Gamma correction is applied when the
data level of the input CCD signal is under 500 mV, and the knee
characteristics apply when that level is over 500 mV. Set up pin 15
as follows to set the Y gain control output level for a 500 mV input
signal to be identical for all three gamma correction circuits.
When pin 15 is open (
γ
= 0.6):.......Pin 17 = 2.54 V
When pin 15 = 4 V (
γ
= max): ........Pin 17 = 2.32 V
Video system V
CC
. This V
CC
is used as the V
CC
for all systems
except the CDS system, the AGC amplifier system and the 75
driver system. Apply 5 V and insert a 0.1 μF capacitor between this
pin and ground.
Aperture dark slope control. The aperture clipping level varies with
the AGC control voltage (pin 7). The clipping level is fixed for
relatively bright situations, i.e., when pin 7 is under 2 V. However, as
the image begins to get darker (i.e., as the pin 7 voltage moves from
about 2 V to the aperture dark point) the clipping level begins to
increase. When the AGC control voltage exceeds the aperture dark
point, the aperture is suppressed for low illumination and the clipping
level increases along with the AGC control voltage. It is this pin that
controls the coefficient for that increase.
Pin 19 = 0 V:........................Minimum coefficient value
Pin 19 = open: .....................Typical coefficient value
Pin 19 = 5 V:........................Maximum coefficient value
Aperture clipping control. The LA7265W clips the aperture whisker
components at the base. This pin adjusts the clipping level. Adjust
this pin if the IC internal slice level is inappropriate.
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