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  1. 2007/08/10 MAX2370 - Complete 450MHz Quadrature Transmitter
General Description

The MAX2370 integrated quadrature transmitter is designed for 450MHz applications. The device takes a differential I/Q baseband input and converts it up to intermediate frequency (IF) through a quadrature modulator and IF variable-gain amplifier (VGA). The signal is then routed to an external IF filter and upconverted to RF through an image-reject mixer and RF VGA. The signal is further amplified with an on-chip power amplifier (PA) driver. An IF synthesizer, an RF synthesizer, a local oscillator buffer, and an SPI™/QSPI™/MICROWIRE™- compatible, 3-wire programmable bus complete the basic functional blocks of this IC.
The MAX2370 is available in a 48-pin TQFN package with exposed paddle and is specified for the extended temperature range (-40°C to +85°C).

Applications

450MHz CDMA/WCDMA Phones
OFDM, cdma2000®, WCDMA, NMT
Wireless Data Links

Features

*450MHz Operating Frequency
*+8dBm Output Power
-64dBc Typical ACPR at ±885kHz Offset
-66dBc Typical ACPR at ±1.125MHz Offset
*100dB Power-Control Range
*Dual Synthesizer for RF and IF Local Oscillators
*SPI/QSPI/MICROWIRE-Compatible 3-Wire Interface Bus
*Single-Sideband Upconverter
*Directly Drives External Power Amplifier



MAX2370ETM
MAX2370ETM+

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