CDS-1402

® ® CDS-1402 14-Bit, Very Fast Settling Correlated Double Sampling Circuit FEATURES Use with 10 to 14-bit A/D converters 5 Megapixels/second minimum throughput (14 bits) ±2.5V input/output ranges, Gain = –1 Low noise, 200µVrms Two independent S/H amplifiers Gain matching between S/H's Offset adjustments for each S/H Four external A/D control lines Small package, 24-pin ceramic DDIP Low power, 350mW Low cost INPUT/OUTPUT CONNECTIONS PIN 1 2 3 4 5 6 7 8 9 10 11 12 FUNCTION OFFSET ADJUST V1 DO NOT CONNECT ANALOG INPUT 1 ANALOG INPUT 2 ANALOG GROUND S/H1 OUT S/H1 ROUT S/H2 SUMMING NODE OFFSET ADJUST V2 DO NOT CONNECT S/H1 COMMAND S/H2 COMMAND PIN 24 23 22 21 20 19 18 17 16 15 14 13 FUNCTION +5V ANALOG SUPPLY ANALOG GROUND V OUT ANALOG GROUND A/D CLOCK2 A/D CLOCK2 A/D CLOCK1 A/D CLOCK1 +5V DIGITAL SUPPLY DIGITAL GROUND ANALOG GROUND –5V ANALOG SUPPLY GENERAL DESCRIPTION The CDS-1402 is an application-specific, correlated double sampling (CDS) circuit designed for electronic-imaging applications that employ CCD's (charge coupled devices) as their photodetector. The CDS-1402 has been optimized for use in digital video applications that employ 10 to 14-bit A/D converters. The low-noise CDS-1402 can accurately determine each pixel's true video signal level by sequentially sampling the pixel's offset signal and its video signal and subtracting the two. The result is that the consequences of residual charge, charge injection and low-frequency "kTC" noise on th...