AD9925

Obsolete

CCD Signal Processor with Vertical Driver and Precision Timing™ Generator

Data Sheet (Rev. A) Product Selection Table

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Overview

Integrated 10-Channel V-Driver
Register Compatible with AD9991 and AD9995
3-Field (6-Phase) Vertical Clock Support
2 Additional Vertical Outputs for Advanced CCDs
Complete On-Chip Timing Generator
Precision Timing™ Core with <600 ps Resolution

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
On-Chip 3V Horizontal and RG Drivers
2-Phase and 4-Phase H-Clock Modes

The AD9925 is a complete 36 MHz front-end solution for digital still camera and other CCD imaging applications. Based on the AD9995 product, the AD9925 includes the analog front end and a fully-programmable timing generator, combined with a 10-channel Vertical Driver (V-Driver). A Precision Timing core allows adjustment of high-speed clocks with approximately 600 ps resolution at 36 MHz operation.

The on-chip V-Driver supports up to 10 channels for use with 3-Field (6-Phase) CCDs. Two additional vertical outputs can be used with CCDs containing advanced video mode readout. Voltage levels of up to +15V and -8V are supported.

The analog front end includes black level clamping, CDS, VGA, and a 12-Bit A/D converter. The timing generator and V-Driver provide all the necessary CCD clocks: RG, H-clocks, V-clocks, sensor gate pulses, substrate clock, and substrate bias control. The internal registers are programmed using a 3-wire serial interface.

Packaged in an 8x8mm CSPBGA, the AD9925 is specified over an operating temperature range of –25°C to +85°C.