Low-Cost, Crystal-Based, Programmable, ASK/FSK Transceiver with Fractional-N PLL

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The MAX7032 crystal-based, fractional-N transceiver is designed to transmit and receive ASK/OOK or FSK data in the 300MHz to 450MHz frequency range with data rates up to 33kbps (Manchester encoded) or 66kbps (NRZ encoded). This device generates a typical output power of +10dBm into a 50Ω load, and exhibits typical sensitivities of -114dBm for ASK data and -110dBm for FSK data. The MAX7032 features separate transmit and receive pins (PAOUT and LNAIN) and provides an internal RF switch that can be used to connect the transmit and receive pins to a common antenna.

The MAX7032 transmit frequency is generated by a 16-bit, fractional-N, phase-locked loop (PLL), while the receiver's local oscillator (LO) is generated by an integer-N PLL. This hybrid architecture eliminates the need for separate transmit and receive crystal reference oscillators because the fractional-N PLL allows the transmit frequency to be set within 2kHz of the receive frequency. The 12-bit resolution of the fractional-N PLL allows frequency multiplication of the crystal frequency in steps of fXTAL/4096. Retaining the fixed-N PLL for the receiver avoids the higher current drain requirements of a fractional-N PLL and keeps the receiver current drain as low as possible.

The fractional-N architecture of the MAX7032 transmit PLL allows the transmit FSK signal to be programmed for exact frequency deviations, and completely eliminates the problems associated with oscillator-pulling FSK signal generation. All frequency-generation components are integrated on-chip, and only a crystal, a 10.7MHz IF filter, and a few discrete components are required to implement a complete antenna/digital data solution.

The MAX7032 is available in a small 5mm x 5mm, 32-pin, thin QFN package, and is specified to operate in the automotive -40°C to +125°C temperature range.
MAX7032: Typical Application Circuit MAX7032: Typical Application Circuit Enlarge+

Key Features

  • +2.1V to +3.6V or +4.5V to +5.5V Single-Supply Operation
  • Single Crystal Transceiver
  • User-Adjustable 300MHz to 450MHz Carrier Frequency
  • ASK/OOK and FSK Modulation
  • User-Adjustable FSK Frequency Deviation Through Fractional-N PLL Register
  • Agile Transmitter Frequency Synthesizer with fXTAL/4096 Carrier-Frequency Spacing
  • +10dBm Output Power into 50Ω Load
  • Integrated TX/RX Switch
  • Integrated Transmit and Receive PLL, VCO, and Loop Filter
  • > 45dB Image Rejection
  • Typical RF Sensitivity*
    • ASK: -114dBm
    • FSK: -110dBm
  • Selectable IF Bandwidth with External Filter
  • RSSI Output with High Dynamic Range
  • Autopolling Low-Power Management
  • < 12.5mA Transmit-Mode Current
  • < 6.7mA Receive-Mode Current
  • < 23.5µA Polling-Mode Current
  • < 800nA Shutdown Current
  • Fast-On Startup Feature, < 250µs
  • Small 32-Pin, Thin QFN Package


  • 2-Way Remote Keyless Entry
  • Garage Door Openers
  • Home Automation
  • Local Telemetry Systems
  • Remote Controls
  • Remote Sensing
  • Security Systems
  • Smoke Alarms

See parametric specs for ISM RF Transceivers < 1GHz (5)

Part NumberFrequency Range
Modulation ModeData Rate
Tx Output Power
RX Sensitivity
MAX7032 300 to 450

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.

MAX7032EVKIT-315: Evaluation Kit for the MAX7032
MAX7032EVKIT-433: Evaluation Kit for the MAX7032
Request Reliability Report for: MAX7032 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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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