MAX7057

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

Data Sheet (Rev. 12)
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Overview

  • 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

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.

Applications

  • Gaming Machines
  • Industrial Controllers
  • System Monitoring
  • White Goods
MAX7057
300MHz to 450MHz Frequency-Programmable ASK/FSK Transmitter
MAX7057: Typical Application Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 10

Evaluation Design File 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
RF Analog Receivers 2
MAX1473
PRODUCTION 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range
MAX1470
PRODUCTION 315MHz Low-Power, +3V Superheterodyne Receiver
RF Analog Transmitters 4
MAX1479
PRODUCTION 300MHz to 450MHz Low-Power, Crystal-Based +10dBm ASK/FSK Transmitter
MAX7044
PRODUCTION 300MHz to 450MHz High-Efficiency, Crystal-Based +13dBm ASK Transmitter
MAX7058
PRODUCTION 315MHz/390MHz Dual-Frequency ASK Transmitter
MAX1472
PRODUCTION 300MHz-to-450MHz Low-Power, Crystal-Based ASK Transmitter
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Evaluation Kits

MAX7057EVKIT

Evaluation Kit for the MAX7057

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Features and Benefits

  • Windows XP-, Windows Vista-, and Windows 7-Compatible Software
  • USB Powered
  • Proven PCB Layout
  • Proven Components List
  • Adjustable Programmable Frequency
  • Fully Assembled and Tested

Product Details

The MAX7057 evaluation kit (EV kit) provides a proven design to evaluate the MAX7057 frequency-programmable ASK/FSK transmitter in a 16-pin SO package. The EV kit uses Windows XP®-, Windows Vista®-, and Windows® 7-compatible software to provide a simple graphical user interface (GUI). The EV kit enables testing of the device's RF performance and requires no additional support circuitry. The RF output uses a 50Ω matching network and an SMA connector for convenient connection to test equipment. The EV kit PCB comes with a MAX7057ASE+ installed on the EV kit.

Applications

  • Garage Door Openers
  • Home Automation
  • RF Remote Controls
  • Security Systems
  • Wireless Computer Peripherals
  • Wireless Game Consoles
  • Wireless Sensors
MAX7057EVKIT
Evaluation Kit for the MAX7057

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