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MAX2140：Complete SDARS Receiver

The MAX2140 complete receiver is designed for satellite digital audio radio services (SDARS). The device includes a fully monolithic VCO and only needs a SAW at the IF and a crystal to generate the reference frequency. To form a complete SDARS radio, the MAX2140 requires only a low-noise amplifier (LNA), which can be controlled by a baseband controller. The small number of external components needed makes the MAX2140-based platform the lowest cost and the smallest solution for SDARS. The receiver includes a self-contained RF AGC loop and baseband-controlled IF AGC loop, effectively providing a total dynamic range of over 92dB. Channel selectivity is ensured by the SAW filter and by on-chip monolithic lowpass filters. The fractional-N PLL allows a very small frequency step, making possible the implementation of an AFC loop. Additionally, the reference is provided by an external XTAL and on-chip oscillator. A reference buffer output is also provided. A 2-wire interface (I²C bus compatible) programs the circuit for a wide variety of conditions, providing features such as: Programmable gains Lowpass filters tuning Individual functional block shutdown The MAX2140 minimizes the requirement on the baseband controller. No compensation or calibration procedures are required. The device is available in a 7mm x 7mm 44-pin thin QFN package.

Key Features Integrated Receiver, Requires Only One SAW Filter Self-Contained RF AGC Loop Differential I/Q Interface Complete Integrated Frequency Generation Bias Supply for External LNAs Overcurrent Protection Low-Power Standby Mode Very Small 44-Pin Thin QFN Package

MAX2140: Block Diagram Applications/Uses 2.4GHz ISM Radios Satellite Digital Audio Radio Services (SDARS)

DataSheet

Parametrics

Design kits & evaluation modules

• MAX2140EVKIT

Quality and Environmental Data

• MAX2140.pdf

Ordering Information