12-Bit CCD Signal Processor with ™ Generator

The AD9994 is a highly integrated CCD signal processor for digital still camera applications. It includes a complete analog front end with A/D conversion, combined with a full-function programmable timing generator. The timing generator is capable of up to 12-phase vertical clocking to support advanced CCDs with 4-field and 5-field readout. A Precision Timing core allows adjustment of high speed clocks with approximately 600 ps resolution at 36 MHz operation.

The AD9994 is specified at pixel rates of up to 36 MHz. The analog front end includes black level clamping, CDS, VGA, and a 12-bit A/D converter. The timing generator provides all the necessary CCD clocks: RG, H-clocks, V-clocks, sensor gate pulses, substrate clock, and substrate bias control. Operation is programmed using a 3-wire serial interface.

Packaged in a 64-lead LFCSP, the AD9994 is specified over an operating temperature range of –25°C to +85°C.

Applications

* Digital still cameras

* 10-phase or 12-phase vertical transfer clocking * Supports 4-field and 5-field CCD readout * Correlated double sampler (CDS) * 6 dB to 42 dB 10-bit variable gain amplifier (VGA) * 12-bit 36 MHz A/D converter * Black level clamp with variable level control