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MAX7031
Low-Cost, 308MHz, 315MHz, and 433.92MHz FSK Transceiver with Fractional-N PLL


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Data Sheet
FULL DATA SHEET (PDF, 288kB)
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Description
The MAX7031 crystal-based, fractional-N transceiver is designed to transmit and receive FSK data at factory-preset carrier frequencies of 308MHz, 315MHz, or 433.92MHz 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 sensitivity of -110dBm. The MAX7031 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 MAX7031 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 is preset to be 10.7MHz above the receive LO. 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 MAX7031 transmit PLL allows the transmit FSK signal to be preset 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 MAX7031 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.

Key Features   Applications/Uses
  • +2.1V to +3.6V or +4.5V to +5.5V Single-Supply Operation
  • Single-Crystal Transceiver
  • Factory-Preset Frequency (No Serial Interface Required)
  • FSK Modulation
  • Factory-Preset FSK Frequency Deviation
  • +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*: -110dBm
  • Selectable IF Bandwidth with External Filter
  • RSSI Output with High Dynamic Range
  • < 12.5mA Transmit-Mode Current
  • < 6.7mA Receive-Mode Current
  • < 800nA Shutdown Current
  • Fast-On Startup Feature, < 250µs
  • Small, 32-Pin, Thin QFN Package
  • Underwriters Laboratories (UL®) Recognized

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

    Key Specifications:   ISM RF Transceivers
    Part Number Solutions Features Applications Frequency Range (MHz) Supply Current (mA) Package Smallest Available Package (max w/pins) (mm2) RoHS Available Price**
    MAX7031  Remote Controls
    Remote Sensing
    Security Systems
    Smoke Alarms
    +10dBm Output Power into 50Ω Load
    FSK Modulation
    Factory-Preset Frequency
    Integrated Tx/Rx Switch
    Single-Crystal Transceiver
    Remote Controls
    Remote Sensing
    Security Systems
    Smoke Alarms
    308 to 433.92 11.6 TQFN/32 26 Yes $2.75 @ 1k
    See All ISM RF Transceivers (9)
    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 prices and delivery, please see the price and availability page or contact an authorized distributor.

    *0.2% BER, 4kbps Manchester-encoded data, 280kHz IF BW

    Application Notes
  • Application Note 3395: Requirements of Remote Keyless Entry (RKE) Systems - MAX7031
  • Application Note 3587: FCC and ETSI Requirements for Short-Range UHF ASK-Modulated Transmitters - MAX7031
  • Application Note 3589: Power Amplifier Theory for High-Efficiency Low-Cost ISM-Band Transmitters - MAX7031
  • Application Note 3815: Radiated Power and Field Strength from UHF ISM Transmitters - MAX7031

    Evaluation Kits
    none

    Reliability Reports
  • Show FIT data for:
  • Request Reliability Report for:
  • Underwriters Laboratories (UL®) Recognized

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-12 of 12

    MAX7031 Free
    Sample
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    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX7031EVKIT-315    


    Land Pattern: Not Available

    See data sheet
    MAX7031EVKIT-433    


    Land Pattern: Not Available

    See data sheet
    MAX7031LATJ+  
    TQFN;32 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0001 (PDF)
    Use pkgcode/variation: T3255+3*
    -40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX7031LATJ+T  


    Land Pattern: Not Available

    -40°C to +125°C See data sheet
    MAX7031MATJ50+  
    TQFN;32 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0001 (PDF)
    Use pkgcode/variation: T3255+3*
    -40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX7031MATJ50+T  


    Land Pattern: Not Available

    -40°C to +125°C See data sheet
    MAX7031HATJ17  
    TQFN;32 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0001 (PDF)
    Use pkgcode/variation: T3255-3*
    -40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7031HATJ17-T  


    Land Pattern: Not Available

    -40°C to +125°C See data sheet
    MAX7031HATJ17+  
    TQFN;32 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0001 (PDF)
    Use pkgcode/variation: T3255+3*
    -40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX7031HATJ17+T  


    Land Pattern: Not Available

    -40°C to +125°C See data sheet
    MAX7031HATJ51+  
    TQFN;32 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0001 (PDF)
    Use pkgcode/variation: T3255+3*
    -40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX7031HATJ51+T  
    TQFN;32 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0001 (PDF)
    Use pkgcode/variation: T3255+3*
    -40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
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    Related Products
    MAX7030 Low-Cost, 315MHz, 345MHz, and 433.92MHz ASK Transceiver with Fractional-N PLL
    MAX7032 Low-Cost, Crystal-Based, Programmable, ASK/FSK Transceiver with Fractional-N PLL

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    Document Ref.: 19-3707; Rev 1; 2008-09-30
    This page last modified: 2008-09-30


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