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MAX1479
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


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Data Sheet
FULL DATA SHEET (PDF, 640kB)
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Description
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 50 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 thin QFN package (3mm x 3mm) and is specified for the automotive temperature range from -40°C to +125°C.

Key Features   Applications/Uses
  • 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 50 Load
  • Low Supply Current (6.7mA in ASK Mode, and 10.5mA in FSK Mode)
  • Uses Small Low-Cost Crystal
  • Small 16-Pin Thin QFN 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

    Key Specifications:   ISM RF Transmitters
    Part Number Applications Band/Freq (MHz) Features Footprint (mm x mm) Smallest Available Package (max w/pins) (mm2) Package Industry Qualified RoHS Available Price**
    MAX1479 
    ISM
    ISM (Europe)
    RKE
    TPM
    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 10 TQFN/16 Automotive - AECQ100
    Automotive - General
    Yes $1.16 @ 1k
    See All ISM RF Transmitters (10)
    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
    MAX1479: Typical Application Circuit
    Typical Application Circuit

    Application Notes
  • Application Note 1955: Fast Start-Up Oscillator (FOX) Boosts Superhet Performance - MAX1479
  • Application Note 3395: Requirements of Remote Keyless Entry (RKE) Systems - MAX1479
  • Application Note 3401: Matching Maxim's 300MHz to 450MHz Transmitters to Small Loop Antennas - MAX1479
  • Application Note 3435: Manchester Data Encoding for Radio Communications - MAX1479
  • Application Note 3587: FCC and ETSI Requirements for Short-Range UHF ASK-Modulated Transmitters - MAX1479
  • Application Note 3589: Power Amplifier Theory for High-Efficiency Low-Cost ISM-Band Transmitters - MAX1479
  • Application Note 3815: Radiated Power and Field Strength from UHF ISM Transmitters - MAX1479
  • Application Note 3945: Path Loss in Remote Keyless Entry Systems - MAX1479

    Evaluation Kits
  • MAX1479EVKIT

    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

    MAX1479 Free
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    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1479ATE  
    TQFN;16 pin;10 mm²
    Outline Drawing: 21-0136 (PDF)
    Land Pattern: 90-0030 (PDF)
    Use pkgcode/variation: T1633-2*
    -40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1479ATE-T  
    TQFN;16 pin;10 mm²
    Outline Drawing: 21-0136 (PDF)
    Land Pattern: 90-0030 (PDF)
    Use pkgcode/variation: T1633-2*
    -40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1479ATE+  
    TQFN;16 pin;10 mm²
    Outline Drawing: 21-0136 (PDF)
    Land Pattern: 90-0030 (PDF)
    Use pkgcode/variation: T1633+2*
    -40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1479ATE+T  
    TQFN;16 pin;10 mm²
    Outline Drawing: 21-0136 (PDF)
    Land Pattern: 90-0030 (PDF)
    Use pkgcode/variation: T1633+2*
    -40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  • Topmark Coding: MAX1479
  • New Product Press Release 2004-08-27 

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    Document Ref.: 19-3353; Rev 0; 2004-08-19
    This page last modified: 2005-07-07


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