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
Part NumberPackage/Pins
See All ISM RF Transceivers < 1GHz (5)
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

Technical Documents

Tutorial 5436 Getting Started with a Radio Design
Tutorial 5428 Squelch in ISM-RF Receivers
Tutorial 5426 Baseband Calculations for ISM-RF Receivers
Tutorial 5422 Crystal Calculations for ISM-RF Products
Tutorial 5417 How to Optimize an ISM Radio Frequency (RF) System
Reference Schematic 5406 LFRD004: 2-Way Remote Control Reference Design
Reference Schematic 5404 LFRD003: Water Meter Automatic Meter Reading (AMR) Reference Design
Reference Schematic 5391 LFRD002: Wireless Automatic Meter Reading Reference Design
Tutorial 5300 RF Basics
Tutorial 5265 Design a Crystal Oscillator to Match Your Application
App Note 5142 Radio Link-Budget Calculations for ISM-RF Products
Tutorial 5100 General Layout Guidelines for RF and Mixed-Signal PCBs
Tutorial 4691 Introduction to Hearing Aids and Important Design Considerations
Tutorial 4686 Important Design Considerations for Heart-Rate and Fitness Monitors
Tutorial 4671 Improve Sensor Performance and SNR in Pulse Oximeter Designs
Tutorial 4636 Avoid PC-Layout "Gotchas" in ISM-RF Products
App Note 3815 Radiated Power and Field Strength from UHF ISM Transmitters
App Note 3671 Data Slicing Techniques for UHF ASK Receivers
App Note 3589 Power Amplifier Theory for High-Efficiency Low-Cost ISM-Band Transmitters
App Note 3587 FCC and ETSI Requirements for Short-Range UHF ASK-Modulated Transmitters
App Note 3395 Requirements of Remote Keyless Entry (RKE) Systems

Quality and Environmental Data

Request Reliability Report for: MAX7032 
Lead-Free Package Tin (Sn) Whisker Reports
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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