AD9948

10-Bit CCD Signal Processor with Precision Timing ™ Core AD9948 FEATURES Correlated Double Sampler (CDS) 0 dB to 18 dB Pixel Gain Amplifier (PxGA®) 6 dB to 42 dB 10-Bit Variable Gain Amplifier (VGA) 10-Bit 25 MSPS A/D Converter Black Level Clamp with Variable Level Control Complete On-Chip Timing Driver Precision Timing Core with 800 ps Resolution On-Chip 3 V Horizontal and RG Drivers 40-Lead LFCSP Package APPLICATIONS Digital Still Cameras High Speed Digital Imaging Applications GENERAL DESCRIPTION The AD9948 is a highly integrated CCD signal processor for digital still camera applications. Specified at pixel rates of up to 25 MHz, the AD9948 consists of a complete analog front end with A/D conversion, combined with a programmable timing driver. The Precision Timing core allows adjustment of high speed clocks with 800 ps resolution. The analog front end includes black level clamping, CDS, PxGA, VGA, and a 25 MHz 10-bit A/D converter. The timing driver provides the high speed CCD clock drivers for RG and H1–H4. Operation is programmed using a 3-wire serial interface. Packaged in a space-saving 40-lead LFCSP package, the AD9948 is specified over an operating temperature range of –20° C to +85° C. FUNCTIONAL BLOCK DIAGRAM REFT REFB 0dB TO 18dB CDS PxGA 6dB TO 42dB VGA VREF 10-BIT ADC 10 DOUT CCDIN CLAMP INTERNAL CLOCKS HBLK CLP/PBLK RG H1–H4 4 HORIZONTAL DRIVERS PRECISION TIMING CORE CLI AD9948 SYNC GENERATOR INTERNAL REGISTERS HD VD SL SCK SDATA REV. 0 Info...