300MHz to 450MHz Frequency-Programmable ASK/FSK Transmitter

Transmit any Frequency in the 300MHz to 450MHz Band with One Crystal While Keeping Your Antenna Matched

Please check latest availability status for a specific part variant.


The MAX7057 frequency-programmable UHF transmitter is designed to transmit ASK/FSK data at a wide range of frequencies from 300MHz to 450MHz. The MAX7057 has internal tuning capacitors at the output of the power amplifier that are programmable for matching to an antenna or load. This allows the user to change to a new frequency and match the antenna at the new frequency simultaneously. The MAX7057 transmits at a data rate up to 100kbps nonreturn-to-zero (NRZ) (50kbps Manchester coded). Typical transmitted power into a 50Ω load is +9.2dBm with a +2.7V supply. The device operates from +2.1V to +3.6V and typically draws under 12.5mA of current in FSK mode (8.5mA in ASK mode) when the antenna-matching network is designed to operate over the 315MHz to 433.92MHz frequency range. For narrower operating frequency ranges, the matching network can be redesigned to improve efficiency. The standby current is less than 1µA at room temperature.

The MAX7057 reference frequency from the crystal oscillator is multiplied by a fully integrated fractional-N phase-locked loop (PLL). The multiplying factor of the PLL is set by a 16-bit number, with 4 bits for integer and 12 bits for fraction; the multiplying factor can be anywhere between 19 and 28. The 12-bit fraction in the synthesizer sets a tuning resolution equal to the reference frequency divided by 4096; frequency deviation can be set as low as ±2kHz and as high as ±100kHz. The fractional-N synthesizer eliminates the problems associated with oscillator-pulling FSK signal generation. The MAX7057 has a serial peripheral interface (SPI) for selecting all the necessary settings.

The MAX7057 is available in a 16-pin SO package and is specified to operate in the -40°C to +125°C automotive temperature range.
MAX7057: Typical Application Circuit MAX7057: Typical Application Circuit Enlarge+

Key Features

  • Programmable Frequency Operation with Single Crystal
  • Internal Variable Capacitor for Antenna Tuning with Single-Matching Network
  • 100kbps Data Rate (NRZ)
  • +2.1V to +3.6V Single-Supply Operation
  • < 12.5mA (FSK), < 8.5mA (ASK) DC Current Drain
  • < 1µA Standby Current
  • ASK/FSK Modulation
  • 47% Carrier Tuning Range Using One Crystal


  • Gaming Machines
  • Industrial Controllers
  • System Monitoring
  • White Goods
Part NumberSolutionsApplicationsBand/ Freq.
See Notes
MAX7057 300 to 450MHz-ISM RKE
Garage Door Openers
Home Automation
ISM (Europe)
RF Remote Controls
Security Systems
300 to 450
$1.37 @1k
See All ISM RF Transmitters (17)
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.

MAX7057EVKIT: Evaluation Kit for the MAX7057

CAD Symbols and Footprints

  • MAX7057ASE+
  • MAX7057ASE+T
  • 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.

    Quality Management System >
    Environmental Management System >


    Related Resources

    16-Bit, 5.9Gsps Interpolating and Modulating RF DAC with JESD204B Interface

    • Simplifies RF Design and Enables New Wireless Communication Architectures
    • Direct RF Synthesis of 600MHz Bandwidth Up to 2.8GHz
    • Highly Flexible and Configurable

    USB-to-SPI Interface Adapter for SC1905 and SC1894

    • USB interface connection to the serial parallel interface to the SC1894 and the SC1905
    • Windows 10, Windows 7
    • USB 3.0 and USB 2.0

    698MHz to 3800MHz RF Power Amplifier Linearizer (RFPAL)

    • RFin/RFout PA Linearizer SoC in Standard CMOS
    • External Reference Clock Support:
    • Low Power Consumption: 1280mW

    300MHz–960MHz ASK Transmitter with I2C Interface

    • Low Implementation Cost
    • Increased Range, Data Rates, and Security
    • Extend Battery Life with Low Supply Current

    300MHz–960MHz ASK Transmitter with I2C Interface

    • Low Implementation Cost
    • Increased Range, Data Rates, and Security
    • Extend Battery Life with Low Supply Current