AD9823_15 Datasheet, PDF (1/8 Pages) Analog Devices – Correlated Double Sampler

FEATURES
40 MHz correlated double sampler (CDS)
Fixed 3.5 dB CDS gain
Low noise optical black clamp circuit
3 V single-supply operation
14-lead TSSOP package
APPLICATIONS
Digital still cameras
Digital video camcorders
CCTV cameras
PC cameras
Portable CCD imaging devices
Correlated Double Sampler (CDS)
AD9823
FUNCTIONAL BLOCK DIAGRAM
AD9823
3.5dB FIXED GAIN
CCDIN
CDS
OUTPUT
BUFFER
OUTPUT
BYP2
CLP
CLP
OUTPUT
BUFFER
INTERNAL
TIMING
INTERNAL
REFERENCE
SHP SHD
BYP1 BYP3
Figure 1. Functional Block Diagram
REFOUT
VDD
GND
PRODUCT DESCRIPTION
The AD9823 is a correlated double sampler for digital camera
applications. It features a 40 MHz CDS amplifier with 3.5 dB of
fixed gain, an internal voltage reference supply, and timing
control for the SHP and SHD sampling clocks. Output buffers
are also included, providing drive strength for PCB traces and
direct connection to an image signal processor such as the
AD9821.
The AD9823 is ideal for applications that need to place the CDS
and VGA/ADC circuits on separate PC boards. The “pseudo
differential” outputs of the AD9823 provide good signal
integrity when interfaced with the differential input AD9821.
The AD9823 operates from a single 3 V power supply, typically
dissipates 50 mW, and is packaged in a 14-lead TSSOP package.
Rev. 0
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