Analog Devices AD9843A manual Complete 10-Bit 20 MSPS, CCD Signal Processor

a	Complete 10-Bit 20 MSPS
	CCD Signal Processor
	AD9843A

FEATURES

20 MSPS Correlated Double Sampler (CDS)

4 dB 6 dB Variable CDS Gain with 6-Bit Resolution 2 dB to 36 dB 10-Bit Variable Gain Amplifier (VGA) Low Noise Clamp Circuits

Analog Preblanking Function

10-Bit 20 MSPS A/D Converter

Auxiliary Inputs with VGA and Input Clamp 3-Wire Serial Digital Interface

3 V Single Supply Operation

Low Power: 65 mW @ 2.7 V Supply 48-Lead LQFP Package

APPLICATIONS

Digital Still Cameras

Digital Video Camcorders

PC Cameras

PRODUCT DESCRIPTION

The AD9843A is a complete analog signal processor for CCD applications. It features a 20 MHz single-channel architecture designed to sample and condition the outputs of interlaced and progressive scan area CCD arrays. The AD9843A’s signal chain consists of an input clamp, correlated double sampler (CDS), digitally controlled variable gain amplifier (VGA), black level clamp, and 10-bit A/D converter. Additional input modes are provided for processing analog video signals.

The internal registers are programmed through a 3-wire serial digital interface. Programmable features include gain adjust- ment, black level adjustment, input configuration, and power- down modes.

The AD9843A operates from a single 3 V power supply, typi- cally dissipates 78 mW, and is packaged in a 48-lead LQFP.

FUNCTIONAL BLOCK DIAGRAM

PBLK	AVDD			AVSS			CLPOB
								DRVDD
	4dB	6dB					CLP
								DRVSS
					2dB~36dB
	CDS
CCDIN								10
				2:1			10-BIT
					VGA			DOUT
				MUX			ADC
	CLP
CLPDM							BANDGAP	VRT
						OFFSET	REFERENCE	VRB
					10
AUX1IN						DAC
	2:1
			BUF		6		INTERNAL
	MUX							CML
AUX2IN						8	BIAS
				INTERNAL
CLP				REGISTERS
								DVDD
	AD9843A				DIGITAL		INTERNAL	DVSS
				INTERFACE			TIMING

SL SCK SDATA SHP SHD DATACLK

REV. 0

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