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MAX1422：12-Bit, 20Msps, +3.3V, Low-Power ADC with Internal Reference

The MAX1422 3.3V, 12-bit analog-to-digital converter (ADC) features a fully differential input, pipelined, 12- stage ADC architecture with wideband track-and-hold (T/H) and digital error correction incorporating a fully-differential signal path. The MAX1422 is optimized for lowpower, high dynamic performance applications in imaging and digital communications. The converter operates from a single 3.3V supply, consuming only 137mW while delivering a 67dB (typ) signal-to-noise ratio (SNR) at a 5MHz input frequency and a 20Msps sampling frequency. The fully-differential input stage has a small signal -3dB bandwidth of 400MHz and may be operated with single-ended inputs. An internal 2.048V precision bandgap reference sets the ADCs full-scale range. A flexible reference structure accommodates an internally or externally applied buffered or unbuffered reference for applications requiring increased accuracy or a different input voltage range. In addition to low operating power, the MAX1422 features two power-down modes, a reference power-down, and a shutdown mode. In reference power-down, the internal bandgap reference is deactivated, resulting in a 2mA (typ) supply current reduction. For idle periods, a full shutdown mode is available to maximize power savings. The MAX1422 provides parallel, offset binary, CMOS-compatible three-state outputs. The MAX1422 is available in a 7mm x 7mm x 1.4mm, 48-pin TQFP package and is specified over the commercial (0°C to +70°C) and extended industrial (-40°C to +85°C) temperature ranges. Pin-compatible higher-speed versions of the MAX1422 are also available. Please refer to the MAX1421 data sheet for 40Msps and the MAX1420 data sheet for 60Msps.

Key Features Single 3.3V Power Supply 67dB SNR at fIN = 5MHz Internal 2.048V Precision Bandgap Reference Differential Wideband Input T/H Amplifier Power-Down Modes 130mW (Reference Shutdown Mode) 10µW (Shutdown Mode) Space-Saving 48-Pin TQFP Package

MAX1422: Functional Diagram Applications/Uses CCD Pixel Processing Data Acquisition IF and Baseband Digitization Medical Ultrasound Imaging Radar

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