12-Bit, 65Msps, IF Sampling ADC

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.

Applications

* Cellular, LMDS, Point-to-Point Microwave, MMDS, HFC, WLAN

* IF and Baseband Communication Receivers: Cellular, Point-to-Point Microwave, HFC, WLAN

* Low-Power Data Acquisition

* MMDS, HFC, WLAN

* Portable Instrumentation

* Ultrasound and Medical Imaging

* 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)