MAX2365

Complete Dual-Band Quadrature Transmitters

Highly Integrated Dual-Band Quadrature Transmitters for Cell Phones

Data Sheet (Rev. 2)

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Overview

Dual-Band, Triple-Mode Operation

+9dBm Linear Output Power

100dB Power-Control Range

Supply Current Drops as Output Power is Reduced

Dual Synthesizer for IF and RF LO

Dual On-Chip IF VCO

QSPI/SPI/MICROWIRE-Compatible 3-Wire Bus

Digitally Controlled Operational Modes

Single Sideband Upconverter Eliminates SAW Filters

Directly Drives Power Amplifier

The MAX2361 dual-band, triple-mode complete transmitter for cellular phones represents an integrated and architecturally advanced solution for this application. The device takes a differential I/Q baseband input and converts it up to IF through a quadrature modulator and IF variable-gain amplifier (VGA). The signal is then routed to an external bandpass filter and upconverted to RF through an image-reject mixer and RF VGA. The signal is further amplified with an on-chip PA driver. An IF synthesizer, an RF synthesizer, a local oscillator (LO) buffer, and a 3-wire programmable bus complete the basic functional blocks of this IC. The MAX2363 supports single-band, single- mode (PCS) operation. The MAX2365 supports single- band cellular dual-mode operation.

The MAX2361 enables architectural flexibility because of its two IF voltage-controlled oscillators (VCOs), two IF ports, two RF LO input ports, and three PA driver output ports. The devices allow the use of a single receive IF frequency and split-band PCS filters for optimum out-ofband noise performance. The low-noise PA drivers allow up to three RF SAW filters to be eliminated. Select a mode of operation by loading data on the SPI™/QSPI™/MICROWIRE™-compatible 3-wire serial bus. Charge-pump current, IF/RF gain balancing, standby, shutdown plus additional functions, are also controlled with the serial interface.

The MAX2361/MAX2363/MAX2365 come in a 48-pin TQFN-EP and QFN-EP package and are specified for the extended (-40°C to +85°C) temperature range.

Applications