300MHz–960MHz ASK Transmitter with I2C Interface

High Output Power for Long Range, with Low Current Consumption - Fully Programmable at a Low Implementation Cost

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The MAX41461/MAX41462 is a UHF sub-GHz ISM/SRD transmitter is designed to transmit On-Off Keying (OOK) or Amplitude-Shift Keying (ASK) data in the 286MHz to 960MHz frequency range. It integrates a fractional phase-locked-loop (PLL), so a single, low-cost crystal can be used to generate commonly used world-wide sub-GHz frequencies. The fast response time of the PLL allows for frequency-hopping spread spectrum protocols for increased range and security. The chip also features preset modes with pin-selectable frequencies so that only one wire is required for external microcontroller interface. The only frequency-dependent components required are for the external antenna matching network. Optionally, the device can be put into programmable mode and programmed using an I2C interface. The crystal-based architecture of the MAX41461/MAX41462 eliminates many of the common problems with SAW-based transmitters by providing greater modulation depth, faster frequency settling, higher tolerance of the transmit frequency, and reduced temperature dependence. A clock-out signal at 800kHz is also provided.

The MAX41461/MAX41462 provides output power up to +13dBm into a 50Ω load while drawing < 8mA (Manchester coded). The output load can be adjusted to increase power up to +16dBm, and a PA boost mode can be enabled at frequencies above 850MHz to compensate for losses. The PA output power can also be controlled using programmable register settings in I2C mode.

The MAX41461/MAX41462 also features single-supply operation from +1.8V to +3.6V. The device has an auto-shutdown feature to extend battery life and a fast oscillator wake-up with data activity detection.

The MAX41461/MAX41462 is available in a 10-pin μMAX package and is specified over the -40°C to +105°C extended temperature range. The MAX41461/MAX41462 has an ESD rating of 2.5kV HBM.

Design Solution: How to Maximize the Wireless Power Range of Your UHF Sub-GHz Short-Range Device ›

MAX41461, MAX41462: Simplified Block Diagram MAX41461, MAX41462: TSimplified Block Diagram Enlarge+

Key Features

  • Low Implementation Cost
    • Bits-to-RF Single Wire Operation
    • Low Bill-of-Materials (BOM)
    • Uses Single, Low-Cost, 16MHz Crystal
    • Small 3mm x 3mm μMAX-10 Package
  • Increased Range, Data Rates, and Security
    • Up to +16dBm PA Output Power
    • Fast Frequency Switching for FHSS/DSSS
    • Fast-On Oscillator: < 250μs Startup Time
    • Up to 200kbps NRZ Data Rate
  • Extend Battery Life with Low Supply Current
    • < 8mA ASK Manchester Coded
    • Selectable Standby and Shutdown Modes
    • Auto Shutdown at < 20nA (typ) Current
  • Ease of Use
    • Pin Selectable 300MHz–928MHz Frequencies
    • Pin Compatible ASK and FSK Versions
    • +1.8V to +3.6V Single-Supply Operation
    • Fully Programmable with 400kHz/1MHz I2C Interface


  • Automatic Meter Reading (AMR)
  • Building Automation and Security
  • Garage Door Openers (GDO)
  • Internet of Things (IoT)
  • Radio Control Toys
  • Remote and Passive Keyless Entry (RKE/PKE)
  • Tire Pressure Monitoring Systems (TPMS)
  • Wireless Sensors and Alarms

See parametric specs for ISM RF Transmitters < 1GHz (15)

Part NumberBand/ Freq.
Tx Output Power
Modulation ModeVSUPPLY
MAX41461 300 to 96016
1.8 to 3.6

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.

MAX41460EVKIT: Evaluation Kit for the MAX41460, MAX41461, MAX41462, MAX41463, MAX41464
MAX41461EVKIT-315: Evaluation Kit for the MAX41460, MAX41461, MAX41462, MAX41463, MAX41464
MAX41462EVKIT-434: Evaluation Kit for the MAX41460, MAX41461, MAX41462, MAX41463, MAX41464
MAX41463EVKIT-915: Evaluation Kit for the MAX41460, MAX41461, MAX41462, MAX41463, MAX41464
Request Reliability Report for: MAX41462 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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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