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