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