ADS5421

ADS5421 ADS5421 SBAS237E – DECEMBER 2001 – REVISED JUNE 2005 14-Bit, 40MHz Sampling ANALOG-TO-DIGITAL CONVERTER FEATURES q HIGH DYNAMIC RANGE: High SFDR: 83dB at 10MHz fIN High SNR: 75dB at 10MHz f IN q ON-BOARD TRACK-AND-HOLD: Differential Inputs Selectable Full-Scale Input Range q FLEXIBLE CLOCKING: Differential or Single-Ended Accepts Sine or Square Wave Clocking Down to 0.5VPP Variable Threshold Level APPLICATIONS q COMMUNICATIONS RECEIVERS q TEST INSTRUMENTATION q PROFESSIONAL CCD IMAGING DESCRIPTION The ADS5421 is a high-dynamic range 14-bit, 40MHz, pipelined Analog-to-Digital Converter (ADC). It includes a high-bandwidth linear track-and-hold amplifier that gives excellent spurious performance up to and beyond the Nyquist rate. The clock input can accept a low-level differential sine wave or square wave signal down to 0.5VPP, further improving the Signal-to-Noise Ratio (SNR) performance. The ADS5421 has a 4VPP differential input range (2VPP 2 inputs) for optimum Spurious-Free Dynamic Range (SFDR). The differential operation gives the lowest even-order harmonic components. A lower input voltage can also be selected using the internal references, further optimizing SFDR. The ADS5421 is available in a small LQFP-64 package. 2VPP 2VPP ADS5421 IN IN CM (+2.5V) T&H +VS Timing Circuitry 14-Bit Pipelined ADC Core Error Correction Logic DV CLK CLK D0 3-State Outputs D13 Reference Ladder and Driver Reference and Mode Select REFT VREF SEL1 SEL2 REFB OE V...