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).
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