General Description
The MAX1211 is a 3.3V, 12-bit analog-to-digital converter (ADC) featuring a fully differential wideband track-and-hold (T/H) input, driving the internal quantizer. The MAX1211 is optimized for low power, small size, and high dynamic performance in intermediate frequency (IF) sampling applications. This ADC operates from a single 3.0V to 3.6V supply, consuming only 340mW while delivering a typical signal-to-noise ratio (SNR) performance of 66.8dB at a 175MHz input frequency. The T/H-driven input stage accepts single-ended or differential inputs. In addition to low operating power, the MAX1211 features a 0.15mW power-down mode to conserve power during idle periods.
A flexible reference structure allows the MAX1211 to use its internal precision bandgap reference or accept an externally applied reference. A common-mode reference is provided to simplify design and reduce external component count in differential analog input circuits.
The MAX1211 supports both a single-ended and differential input clock drive. Wide variations in the clock duty cycle are compensated with the ADC’s internal duty-cycle equalizer.
The MAX1211 features parallel, CMOS-compatible outputs. The digital output format is pin selectable to be either two’s complement or Gray code. A data-valid indicator eliminates external components that are normally required for reliable digital interfacing. A separate power input for the digital outputs accepts a voltage from 1.7V to 3.6V for flexible interfacing with various logic levels. The MAX1211 is available in a 6mm x 6mm x 0.8mm, 40-pin thin QFN package with exposed paddle (EP), and is specified for the extended industrial (-40°C to +85°C) temperature range.

FEATUREs
♦ Direct IF Sampling Up to 400MHz
♦ 700MHz Input Bandwidth
♦ Excellent Dynamic Performance
   66.8dB SNR at fIN = 175MHz
   79.7dBc SFDR at fIN = 175MHz
♦ 3.3V Low-Power Operation
   314mW (Single-Ended Clock Mode)
   340mW (Differential Clock Mode)
♦ Differential or Single-Ended Clock
♦ Accepts 20% to 80% Clock Duty Cycle
♦ Fully Differential or Single-Ended Analog Input
♦ Adjustable Full-Scale Analog Input Range
♦ Common-Mode Reference
♦ Power-Down Mode
♦ CMOS-Compatible Outputs in Two’s Complement or Gray Code
♦ Data-Valid Indicator Simplifies Digital Interface
♦ Out-of-Range Indicator
♦ Miniature, 40-Pin Thin QFN Package with Exposed Paddle
♦ Evaluation Kit Available (Order MAX1211EVKIT)

APPLICATIONs
   IF and Baseband Communication Receivers
      Cellular, LMDS, Point-to-Point Microwave,
      MMDS, HFC, WLAN
   Ultrasound and Medical Imaging
   Portable Instrumentation
   Low-Power Data Acquisition