Complete SDARS Receiver

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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.
MAX2140: Block Diagram MAX2140: Block Diagram Enlarge+

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


  • 2.4GHz ISM Radios
  • Satellite Digital Audio Radio Services (SDARS)
Part NumberApplicationsSolutionsBand/ Freq.
(mm x mm)
See Notes
2.4GHz ISM
SAT2200 to 25007.0 x 7.0
$8.46 @1k
See All Radio Receivers (6)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX2140EVKIT: Evaluation Kit for the MAX2140
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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Related Resources

Ultra-Wideband, Direct-Conversion, L-Band Satellite Tuner

  • 925MHz to 2175MHz Frequency Range
  • Monolithic VCO
  • High Dynamic Range: -75dBm to 0dBm

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