icx077al Sony Electronics, icx077al Datasheet - Page 12

• Manufacturer Part Number: icx077al
• Description: Timing Controller For Icx076/077al
• Manufacturer: Sony Electronics

(e) Backlight compensation
Basic Circuit Configuration
CXD2409R
By applying the window pulse to the electronic iris detection signal (IRIS) input to IRIN (Pin 20) and the
AGC detection signal (DET OUT) input to AGCI1 (Pin 26), backlight compensation can be performed.
Compensation is achieved by detecting a limited area with the built-in analog switch for the window and the
external sample-and-hold capacitor. In addition, four types of backlight compensation areas can be
selected by combining the WSEL1 pin (Pin 59) and WSEL2 pin (Pin 60) as shown in the table below.
The basic circuit to perform the window operations is shown in the figure below, and window pulse timing
charts are shown on the following pages.
Window types
WSEL1
1
The signal is masked during blanking.
H
H
L
L
AGC window switch
Iris window switch
Window pulse
WSEL2
Comparator for iris
H
H
L
L
(WND)
Full measurement
Lower measurement
Center measurement
Lower center measurement
Minimum shutter speed
AGCO1
DETC4
AGCI1
IRIN
18
20
26
28
1
GND
– 12 –
2SC2785
GND
10k
+5V
2SC2785
100k
10k
39k
10k
1µ
1k
10k
10k
10k
27
19
13
OP+
DET OUT
IRIS
CXA1310Q
CXD2409R