CXD2409R Ver la hoja de datos (PDF) - Sony Semiconductor

Número de pieza

componentes Descripción

Fabricante

CXD2409R

Timing Controller for ICX076/077AL

Sony Semiconductor 

CXD2409R

(e) Backlight compensation

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 WSEL2

Minimum shutter speed

L

L

Full measurement∗1

H

L Lower measurement

L

H Center measurement

H

H Lower center measurement

∗1 The signal is masked during blanking.

Basic Circuit Configuration

Comparator for iris

DETC4

18

Iris window switch

Window pulse

(WND)

20

IRIN

CXD2409R

AGC window switch

AGCO1

28

26

AGCI1

+5V

2SC2785

27 IRIS

39k 1µ 10k 10k

2SC2785

10k

10k

10k

CXA1310Q

GND

19 OP+

13 DET OUT

GND

10k

1k

100k

– 12 –

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