AD9941 Datasheet | Analog Devices

FEATURES Differential sensor input with 1 V p-p input range 0 d B/6 d B 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 m W @ 3.0 V, 56 MHz 48-lead LQFP package .. GENERAL DESCRIPTION The AD9941 is a plete 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 m W, 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 0d B, 6d B VIN+ BAND GAP REFERENCE DRVDD DRVSS 14 VIN- 14-BIT ADC DOUT CLPOB 8 INTERNAL REGISTERS BLK CLAMP LEVEL DIGITAL INTERFACE DVDD DVSS 05504-001 SDATA ADCLK Figure 1. Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their...