The MAX2548 quad-band direct-conversion RF-to-bits
radio receiver is designed for 1x (3.84Mcps) and 2x
(7.68Mcps) TDD-WCDMA applications. The part supports
operation in the 915MHz to 921MHz, 1900MHz to
1920MHz, 2010MHz to 2025MHz, and 2050MHz to
2082MHz frequency bands.
The unique RF-to-bits architecture of the MAX2548 integrates
4 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 bit-stream
through an LVDS-like interface. All decimation,
compensation, and channel filtering is performed in the
digital domain in compliance with the MAX-PHY digital
section definition. The operating mode of the radio is fully
programmable by a 3-wire serial interface.
The MAX2548 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).
Key Features
Applications/Uses
Complete RF In to Digital Bits Out Radio Receiver Subsystem
Supports 1x (3.84Mcps) and 2x (7.68Mcps) TDD-WCDMA Operation in the Following Bands:
915MHz to 921MHz
1900MHz to 1920MHz
2010MHz to 2025MHz
2050MHz to 2082MHz
MAX-PHY Digital Rx Interface with Single-Bit I and Q Bitstreams
Complete Two-Chip TDD-WCDMA Solution with MAX2598 Transmitter
High Dynamic Range Sigma-Delta ADCs Allow Simple AGC Implementation with Switched Gain States
On-Chip Fractional-N Frequency Synthesizers for LO and Sampling Clock Generation
Dual Buffered Reference Outputs to Drive Transmit IC and Baseband/DSP
Operation Controlled Entirely by 3-Wire Serial Interface; No Analog Control Signals Necessary
