MAX2700

1.8GHz to 2.5GHz, Direct-Downconversion Receivers

First Direct-Conversion Receiver for Wideband Wireless Local Loop


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Description

The MAX2700/MAX2701 are highly integrated direct downconversion (zero-IF) receivers designed for wideband wireless local loop (WLL) systems operating in the 1.8GHz to 2.5GHz band. The MAX2700/MAX2701s' zero-IF architecture eliminates the need for IF downconversion stages and the use of an IF SAW filter. This reduces the overall receiver cost by reducing the component count and required board space.

The MAX2700/MAX2701 have three main blocks: low-noise amplifier (LNA), quadrature downconverter, and baseband variable gain amplifiers (VGAs). The LNA is a single-ended amplifier with selectable gain and shutdown options. It provides a high input third-order intercept point (IP3), which reduces cross-modulation and gain compression due to high-level RF interference. The quadrature downconverter section consists of two highly linear double-balanced mixers driven by an external local oscillator (LO) with a selectable LO doubler. The double-balanced mixers are optimized to provide high input IP3 and minimum added noise. The mixers’ high input second-order intercept point (IIP2) helps minimize receiver desensitization due to high-level AM-modulated interferers.

The two baseband VGAs in each channel provide 80dB of total maximum gain and greater than 60dB of gain control. The first AGC amplifier is optimized for low noise, low power dissipation, and high linearity over the entire gain range to ensure high gain compression performance. An external lowpass filter between baseband VGAs provides the required channel selectivity at the adjacent channel. An integrated gain offset correction loop circuit provides <0.3dB amplitude mismatch between the I and Q channels.

The MAX2700/MAX2701 operate from a single +2.7V to +3.3V power supply, drawing only 165mA of supply current and 20µA in shutdown mode. Both devices are available in small 48-pin TQFP packages with exposed paddle (EP) for optimum high-frequency performance.

Key Features

  • Input Frequency Range
    • 1.8GHz to 2.1GHz (MAX2700)
    • 2.1GHz to 2.5GHz (MAX2701)
  • Cascaded Performance at 1960 MHz
    • 3.5dB Noise Figure
    • -7.5dBm Input IP3 at Maximum Gain
  • LNA with Selectable Gain and Shutdown Option
  • High Linearity Direct I/Q Downconverter
  • Wideband LO Quadrature Generator
  • 3dB Baseband Channel Bandwidth of At Least 56MHz
  • Variable Gain Baseband Amplifiers with > 60dB Control Range
  • Baseband Gain Offset Correction Loop
  • +2.7V to +3.3V Single-Supply Operation
  • Small 48-pin TQFP-EP Package

Applications/Uses

  • Digital Microwave Radios
  • Two-Way MMDS
  • Wideband 2.4GHz ISM Radios
  • Wideband Direct-Sequence Spread-Spectrum Systems
  • Wireless Local Loop (WLL)

Technical Documents

Tutorial 5100 General Layout Guidelines for RF and Mixed-Signal PCBs
Tutorial 2875 Three Methods of Noise Figure Measurement

Quality and Environmental Data

Request Reliability Report for: MAX2700 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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