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The MAX2547 direct-conversion RF-to-bits radio receiver
is designed for Band I (1920MHz to 1980MHz)
WCDMA/HSPA femto-basestation applications. The
receiver also features a separate dedicated receive
path for the 2110MHz to 2170MHz band that enables
monitoring of macro cell downlink activity (sniffer mode).
The unique RF-to-bits architecture of the MAX2547 integrates
2 LNAs, quadrature mixers, baseband anti-aliasing
filters, programmable gain baseband amplifiers,
high dynamic range I and Q sigma-delta analog-to-digital
converters (ADCs), a fractional-N frequency synthesizer
for local oscillator (LO) generation, and a
fractional-N frequency synthesizer for sampling clock
generation. Data is transferred from the radio to the
baseband/DSP by a digital 1-bit sigma-delta-modulated
I and Q bitstream through an LVDS-like interface. All
decimation, compensation, and channel filtering is performed
in the digital domain. Digital IP blocks are available
from Maxim. The operating mode of the radio is
fully programmable by a 3-wire serial interface.
The MAX2547 is specified for operation in the extended
-40°C to +85°C temperature range and is available in a
7mm x 7mm x 1.4mm fcLGA package with exposed
paddle (EP).
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