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MAX7044
300MHz to 450MHz High-Efficiency, Crystal-Based +13dBm ASK Transmitter

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


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Data Sheet
FULL DATA SHEET (PDF, 208kB)
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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.

Key Features   Applications/Uses
  • +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
* At 50% duty cycle (315MHz, 2.7V supply, +13dBm output power)

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

    Key Specifications:   Transmit System ICs
    Part Number Solutions Applications Min. Frequency (MHz) Max. Frequency (MHz) Features Industry Qualified Footprint (mm x mm) Package RoHS Available Price**
    MAX7044  300 to 450MHz-ISM RKE
    ISM
    ISM (Europe)
    RKE
    300 450
    2.1V to 3.6V Single-Supply Operation
    Low 7.7mA Operating Supply Current (50% duty cycle)
    Output Power Adjustable to >+13dBm
    Supports ASK with 90dBm Modulation Depth
    Uses Small Low-Cost XTAL
    Automotive - General 3.0 x 3.0 SOT-23/8 Yes $1.26 @ 1k
    See All Transmit System ICs (19)
    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 prices and delivery, please see the price and availability page or contact an authorized distributor.

    Diagram
    MAX7044: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  • Application Note 3395: Requirements of Remote Keyless Entry (RKE) Systems - MAX7044
  • Application Note 3401: Matching Maxim's 300MHz to 450MHz Transmitters to Small Loop Antennas - MAX7044
  • Application Note 3587: FCC and ETSI Requirements for Short-Range UHF ASK-Modulated Transmitters - MAX7044
  • Application Note 3589: Power Amplifier Theory for High-Efficiency Low-Cost ISM-Band Transmitters - MAX7044
  • Application Note 3815: Radiated Power and Field Strength from UHF ISM Transmitters - MAX7044
  • Application Note 4302: Small Antennas for 300MHz to 450MHz Transmitters - MAx7044

    Evaluation Kits
  • MAX7044EVKIT

    Design Guides
  • WIRELESS (PDF)

    Reliability Reports
  • Show FIT data for:
  • Request Reliability Report for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-4 of 4

    MAX7044 Free
    Sample
    Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX7044AKA  
    SOT-23;8 pin;
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8SN-1*
    -40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7044AKA+  
    SOT-23;8 pin;
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8SN+1*
    -40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX7044AKA-T  
    SOT-23;8 pin;
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8SN-1*
    -40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7044AKA+T  
    SOT-23;8 pin;
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8SN+1*
    -40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  • Topmark Coding: MAX7044
  • New Product Press Release 2004-03-01 
  • Product Family Ad: Download

    Related Products
    MAX1473 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range

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    Document Ref.: 19-3221; Rev 2; 2005-01-20
    This page last modified: 2008-08-29



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