AD9937

CCD Signal Processor with Precision Timing™ Generator AD9937 FEATURES 12 MSPS Correlated Double Sampler (CDS) 10-Bit 12 MHz A/D Converter No Missing Codes Guaranteed 6 dB to 40 dB Variable Gain Amplifier (VGA) Black Level Clamp with Variable Level Control Complete On-Chip Timing Generator Precision Timing Core with 1.7 ns Resolution On-Chip: 6-Channel Horizontal and 1-Channel RS Drivers 4-Phase Vertical Transfer Clocks Electronic and Mechanical Shutter Modes On-Chip Sync Generator with External Sync Option APPLICATIONS Digital Still Cameras Industrial Imaging GENERAL DESCRIPTION The AD9937 is a highly integrated CCD signal processor. It includes a complete analog front end with A/D conversion, combined with a full-function programmable timing generator. A Precision Timing core allows adjustment of high speed clocks with 1.7 ns resolution at 12 MHz operation. The AD9937 is specified at pixel rates of up to 12 MHz. The analog front end includes black level clamping, CDS, VGA, and a 10-bit A/D converter. The timing generator provides all the necessary CCD clocks: RS, H-clocks, V-clocks, sensor gate pulses, and substrate charge reset pulse. Operation is programmed using a 3-wire serial interface. The AD9937 is packaged in a 56-lead LFCSP and specified over an operating temperature range of –25°C to +85°C. FUNCTIONAL BLOCK DIAGRAM REFT REFB AD9937 6dB TO 40dB VREF 10 CDS VGA ADC DOUT CLAMP INTERNAL CLOCKS RS 6 HORIZONTAL DRIVERS PRECISION TIMING GENERATOR VCLK H1 A–D H2 A, B...