300MHz to 450MHz Low-Power, Crystal-Based +10dBm ASK/FSK Transmitter

300MHz to 450MHz Low-Power, Crystal-Based ASK/FSK Transmitter has More than +10dBm Output


The MAX1479 crystal-referenced phase-locked-loop (PLL) VHF/UHF transmitter is designed to transmit ASK, OOK, and FSK data in the 300MHz to 450MHz frequency range. The MAX1479 supports data rates up to 100kbps in ASK mode and 20kbps in FSK mode (both Manchester coded). The device provides an adjustable output power of more than +10dBm into a 50Ω load. The crystal-based architecture of the MAX1479 eliminates many of the common problems of SAW-based transmitters by providing greater modulation depth, faster frequency settling, higher tolerance of the transmit frequency, and reduced temperature dependence. These improvements enable better overall receiver performance when using the MAX1479 together with a superheterodyne receiver such as the MAX1470, MAX1471, MAX1473, or MAX7033.

The MAX1479 is available in a 16-pin TQFN package (3mm x 3mm) and is specified for the automotive temperature range from -40°C to +125°C.
MAX1479: Typical Application Circuit MAX1479: Typical Application Circuit Enlarge+

Key Features

  • ETSI-Compliant EN300 220
  • +2.1V to +3.6V Single-Supply Operation
  • Supports ASK, OOK, and FSK Modulations
  • Adjustable FSK Shift
  • +10dBm Output Power into 50Ω Load
  • Low Supply Current (6.7mA in ASK Mode, and 10.5mA in FSK Mode)
  • Uses Small Low-Cost Crystal
  • Small 16-Pin TQFN Package
  • Fast-On Oscillator—200µs Startup Time
  • Programmable Clock Output


  • Garage Door Openers
  • Radio-Controlled Toys
  • Remote Keyless Entry (RKE)
  • RF Remote Controls
  • Security Systems
  • Tire-Pressure Monitoring (TPM)
  • Wireless Computer Peripherals
  • Wireless Game Consoles
  • Wireless Sensors
Part Number Solutions Applications Band/ Freq.
Features Footprint
(mm x mm)
See Notes
MAX1479  300 to 450MHz-ISM RKE
Garage Door Openers
Home Automation
ISM (Europe)
RF Remote Controls
Security Systems
300 to 450
2.1V to 3.6V Single-Supply Operation
200 us Start-Up Time
Adjustable FSK Shift
ETSI-Compliant EN300 220
Low Supply Current (6.7mA in ASK Mode, and 10.5mA in FSK Mode)
Output Power Adjustable to >+10dBm
Small 16-pin Thin QFN Package
Supports ASK, OOK
3.0 x 3.0 $1.06 @1k
See All ISM RF Transmitters (13)
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.

MAX1479EVKIT: Evaluation Kit for the MAX1479

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