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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)： | 12/24頁 |
| 文件大小： | 355K |
| 代理商： | LA7265W |
Continued from preceding page.
Unit (resistance:
), I: input, O: output, B: I/O, P: power supply
Function
No. 4850-12/24
LA7265W
Pin No.
Symbol
I/O
Equivalent circuit
12
13
14
15
V
REF
Y1. OUT
Y1. IN
GAMMA
O
O
I
I
1.8 V reference voltage. This pin outputs the OPB clamping
reference voltage used by pins 14, 23, 24 and 29. Insert a capacitor
between this pin and ground to stabilize this voltage.
Output for the signal amplified by the AGC circuit.
The signal that passed through the AGC amplifier is input to this pin
through a low-pass filter and a coupling capacitor. OPB clamping is
applied at the input stage. This clamping is applied with the timing of
the clamping pulse input to pin 41. The clamping level is about 1.8 V,
and when the OPB level is 1.8 V signals and noise with a level of
under about 0.5 V must not be input. If signals or noise at such levels
occur, or if pedestal displacement occurs at pin 23, (both of these
condition occur when the AGC maximum gain is at its maximum
level) first low clip the signal by inserting an NPN emitter follower at
pin 13, and then insert a low-pass filter. Use a low-pass filter with an
input impedance ratio of 1:10.
Gamma circuit selection and gamma variation control. The signal
OPB clamped at pin 14 is divided into two paths. The first path goes
to the gamma correction system. First, this signal is blanked with the
timing of the pre-blanking pulse input to pin 39 and pedestal is added
by a built-in DC source with a level essentially identical to the OPB
level. At that time, low clipping is applied at a level about 300 mV or
more below the OPB level. Next, the signal passes through the
γ
correction circuit. However, there are three
γ
-correction circuits, one
with
γ
= 0.45, one with
γ
= 1, and one with a variable
γ
. The gamma
correction circuit is selected by this pin.
Pin 15 = 0 V:........................The
γ
= 0.45 circuit is used.
Pin 15 = 1 to 4 V:.................The variable
γ
circuit is used.
(When pin 15 is open:..........The variable
γ
circuit at
γ
= 0.6 is used.)
Pin 15 = 5 V:........................The
γ
= 1 circuit is used.
To select the maximum
γ
for the variable
γ
circuit, set the pin 15
voltage to 4 V. See the description of pin 35 for the second signal
path
Continued on next page.
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