AD9941

Complete 14-Bit, 56 MSPS Imaging Signal Processor AD9941 FEATURES Differential sensor input with 1 V p-p input range 0 dB/6 dB variable gain amplifier (VGA) Low noise optical black clamp circuit 14-bit, 56 MSPS analog-to-digital converter (ADC) No missing codes guaranteed 3-wire serial digital interface 3 V single-supply operation Low power CMOS: 145 mW @ 3.0 V, 56 MHz 48-lead LQFP package www.DataSheet4U.com GENERAL DESCRIPTION The AD9941 is a complete analog signal processor for imaging applications that do not require correlated double sampling (CDS). It is also suitable for processing the output signal from the AD9940 CDS front end product. It features a 56 MHz, singlechannel architecture designed to sample and condition the output of CMOS imagers and CCD arrays already containing on-chip CDS. The AD9941 signal chain consists of a differential input sample-and-hold amplifier (SHA), a digitally controlled variable gain amplifier (VGA), a black level clamp, and a 14-bit ADC. The internal registers are programmed through a 3-wire serial digital interface. The AD9941 operates from a single 3 V supply, typically dissipates 145 mW, and is packaged in a 48-lead LQFP. APPLICATIONS Digital still cameras using CMOS imagers Professional HDTV camcorders Professional/high-end digital cameras Broadcast cameras FUNCTIONAL BLOCK DIAGRAM AVDD AVSS REFT REFB PBLK AD9941 0dB, 6dB VIN+ SHA BAND GAP REFERENCE DRVDD DRVSS 14 VGA VIN– 14-BIT ADC DOUT CLP CLPOB 8 INTERNAL REGIST...