WCDMA Quasi-Direct Modulator with VGA and PA Driver

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Part Details
  • 5% EVM for POUT = +6dBm
  • 1920MHz to 1980MHz Operation
  • +2.7V to +3.3V Single-Supply Operation
  • +6dBm Output Power at 72mA
  • 81dB Minimum Automatic Gain-Control (AGC) Range
  • Automatic ICC Throttle Back for Optimal Power Consumption
  • No IF SAW Filter Necessary
  • On-Chip RF PLL, with Fully Monolithic VCO
  • Ultra-Low External Component Count
Additional Details
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The MAX2395 fully monolithic quasi-direct modulator IC is designed for use in WCDMA/UMTS transmitters. The quasi-direct modulation architecture reduces system cost, component count, and board space compared to transmitters using an IF SAW filter with IF VCO and IF synthesizer blocks.

The MAX2395 includes I/Q baseband filters, an IF I/Q modulator with VGA, a fully monolithic VCO with PLL, an upconverter mixer, an RF VGA, and a power amplifier (PA) driver. The use of the quasi-direct modulator scheme ensures 5% (typ) EVM and a 30dB (min) carrier suppression. The RF VGA and IF VGA provide a nominal 90dB of output power control. No external local oscillators are required, enabling efficient implementation of variable duplex offset systems.

The PLL is programmed by loading data on the SPI™/MICROWIRE™-compatible 3-wire serial bus. The IC operates from a single +2.7V to +3.3V supply. The devices are available in space-saving 28-pin QFN and thin QFN exposed-pad packages (5mm x 5mm).


  • UMTS/EDGE Phones
  • W-TDD Phones
  • WCDMA Phones

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