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General Description

The MAX12557 is a dual 3.3V, 14-bit analog-to-digital converter (ADC) featuring fully differential wideband track-and-hold (T/H) inputs, driving internal quantizers. The MAX12557 is optimized for low power, small size, and high dynamic performance in intermediate frequency (IF) and baseband sampling applications. This dual ADC operates from a single 3.3V supply, consuming only 610mW while delivering a typical 72.5dB signal-to-noise ratio (SNR) performance at a 175MHz input frequency. The T/H input stages accept single-ended or differential inputs up to 400MHz. In addition to low operating power, the MAX12557 features a 166μW powerdown mode to conserve power during idle periods.

Features

? Direct IF Sampling Up to 400MHz

? Excellent Dynamic Performance

??? 74.1dB/72.5dB SNR at fIN = 70MHz/175MHz

??? 83.4dBc/79.5dBc SFDR at fIN = 70MHz/175MHz

? 3.3V Low-Power Operation

??? 637mW (Differential Clock Mode)

??? 610mW (Single-Ended Clock Mode)

? Fully Differential or Single-Ended Analog Input

? Adjustable Differential Analog Input Voltage

? 750MHz Input Bandwidth

? Adjustable, Internal or External, Shared Reference

? Differential or Single-Ended Clock

? Accepts 25 to 75 Clock Duty Cycle

? User-Selectable DIV2 and DIV4 Clock Modes

? Power-Down Mode

? CMOS Outputs in Two’s Complement or Gray Code

? Out-of-Range and Data-Valid Indicators

? Small, 68-Pin Thin QFN Package

? 12-Bit Compatible Version Available (MAX12527)

? Evaluation Kit Available (Order MAX12557 EV Kit)

Applications

??? IF and Baseband Communication Receivers Cellular, LMDS, Point-to-Point Microwave, MMDS, HFC, WLAN

??? I/Q Receivers

??? Ultrasound and Medical Imaging

??? Portable Instrumentation

??? Digital Set-Top Boxes

??? Low-Power Data Acquisition