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300MHz to 450MHz High-Efficiency, Crystal-Based +13dBm ASK Transmitter

Low-Power, 300MHz to 450MHz, Crystal-Based ASK Transmitter has +13dBm Output Power

Product Details

Key Features

Applications/Uses

Parametric specs for ISM RF Transmitters < 1GHz
Band/ Freq. (MHz) 300 to 450
Tx Output Power (dBm) (max) 12.5
Modulation Mode ASK
OOK
VSUPPLY (V) 2.1 to 3.6
Package/Pins SOT23/8
Budgetary
Price (See Notes)
1.47
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Simplified Block Diagram

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Parameters

Parametric specs for ISM RF Transmitters < 1GHz
Band/ Freq. (MHz) 300 to 450
Tx Output Power (dBm) (max) 12.5
Modulation Mode ASK
OOK
VSUPPLY (V) 2.1 to 3.6
Package/Pins SOT23/8
Budgetary
Price (See Notes)
1.47

Key Features

  • +2.1V to +3.6V Single-Supply Operation
  • OOK/ASK Transmit Data Format
  • Up to 100kbps Data Rate
  • +13dBm Output Power into 50Ω Load
  • Low 7.7mA (typ) Operating Supply Current*
  • Uses Small, Low-Cost Crystal
  • Small 3mm x 3mm 8-Pin SOT23 Package
  • Fast-On Oscillator: 250µs Startup Time

Applications/Uses

  • Garage Door Openers
  • Remote Keyless Entry (RKE)
  • RF Remote Controls
  • Security Systems
  • Tire-Pressure Monitoring (TPM)
  • Wireless Computer Peripherals
  • Wireless Game Consoles
  • Wireless Sensors

Description

The MAX7044 crystal-referenced phase-locked-loop (PLL) VHF/UHF transmitter is designed to transmit OOK/ASK data in the 300MHz to 450MHz frequency range. The MAX7044 supports data rates up to 100kbps, and provides output power up to +13dBm into a 50Ω load while only drawing 7.7mA at 2.7V.

The crystal-based architecture of the MAX7044 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. The MAX7044 also features a low supply voltage of +2.1V to +3.6V. These improvements enable better overall receiver performance when using the MAX7044 together with a superheterodyne receiver such as the MAX1470 or MAX1473.

A simple, single-input data interface and a buffered clock-out signal at 1/16th the crystal frequency make the MAX7044 compatible with almost any microcontroller or code-hopping generator.

The MAX7044 is available in an 8-pin SOT23 package and is specified over the -40°C to +125°C automotive temperature range.

Simplified Block Diagram

MAX7044: Functional Diagram MAX7044: Functional Diagram Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .