MAX7044
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MAX7044

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

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

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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
Additional Details
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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.

Applications

  • Garage Door Openers
  • Remote Keyless Entry (RKE)
  • RF Remote Controls
  • Security Systems
  • Tire-Pressure Monitoring (TPM)
  • Wireless Computer Peripherals
  • Wireless Game Consoles
  • Wireless Sensors
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Part Models 2
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MAX7044

Documentation

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Data Sheet

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UPDATED 05/10/2017
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MAX7044: 300MHz to 450MHz High-Efficiency, Crystal-Based +13dBm ASK Transmitter Data Sheet (Rev.5)

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UPDATED 01/01/1900
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MAX7044: 300MHz至450MHz、高效率、基于晶振的+13dBm ASK发送器 Data Sheet

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UPDATED 08/25/2010
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MAX7044: 300MHz～450MHz、高効率、水晶ベース、+13dBm ASKトランスミッタ Data Sheet (Rev.3)

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Reliability Data

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UPDATED 01/12/2023
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MAX7044 Reliability Data redirect icon

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Technical Articles

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UPDATED 04/12/2012
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RF Basics Guide redirect icon

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UPDATED 09/18/2012
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Design a Crystal Oscillator to Match Your Application redirect icon

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UPDATED 09/23/2008
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Small Antennas for 300MHz to 450MHz Transmitters redirect icon

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UPDATED 01/07/2009
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用于300MHz至450MHz发送器的小型天线 redirect icon

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UPDATED 02/24/2009
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300MHz～450MHzトランスミッタ用小型アンテナ redirect icon

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UPDATED 04/12/2011
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Avoid PC-Layout \"Gotchas\" in ISM-RF Products redirect icon

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UPDATED 08/18/2011
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避免ISM-RF产品中的PCB布局“缺陷” redirect icon

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UPDATED 03/01/2007
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Radiated Power and Field Strength from UHF ISM Transmitters redirect icon

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UPDATED 10/23/2007
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UHF ISM波段发射器的辐射功率和场强测试 redirect icon

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UPDATED 07/26/2007
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UHF ISMトランスミッタの放射電力と電界強度 redirect icon

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UPDATED 09/08/2005
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Power Amplifier Theory for High-Efficiency Low-Cost ISM-Band Transmitters redirect icon

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UPDATED 04/26/2006
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FCC and ETSI Requirements for Short-Range UHF ASK-Modulated Transmitters redirect icon

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UPDATED 07/06/2007
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高效率﹑低成本ISM频段发送器中的功放 redirect icon

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UPDATED 10/31/2006
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FCC和ETSI对ASK调制、短距离UHF发送器的要求 redirect icon

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UPDATED 09/11/2007
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高効率、低コストのISM帯域トランスミッタのためのパワーアンプ理論 redirect icon

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UPDATED 07/09/2006
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短距離UHF ASK変調トランスミッタに関するFCCおよびETSIの要件 redirect icon

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UPDATED 12/21/2004
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Matching Maxim's 300MHz to 450MHz Transmitters to Small Loop Antennas redirect icon

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UPDATED 05/01/2008
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Maxim 300MHz至450MHz发送器到小环形天线的匹配网络 redirect icon

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UPDATED 05/13/2005
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マキシムの300MHz～450MHzトランスミッタを小型ループアンテナにマッチング redirect icon

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UPDATED 02/16/2005
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Requirements of Remote Keyless Entry (RKE) Systems redirect icon

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UPDATED 06/28/2007
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遥控门禁(RKE)系统的设计要求 redirect icon

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UPDATED 04/26/2005
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リモートキーレスエントリ(RKE)システムの要件 redirect icon

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UPDATED 11/02/2011
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Radio Link-Budget Calculations for ISM-RF Products redirect icon

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UPDATED 04/08/2012
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ISM RF产品的无线链路计算 redirect icon

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UPDATED 04/03/2012
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Flexible Configuration of the MAX7060 ASK/FSK ISM-RF Transmitter redirect icon

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UPDATED 06/10/2012
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柔軟性の高いASK/FSK ISM-RFトランスミッタMAX7060の設定 redirect icon

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UPDATED 10/01/2012
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How to Optimize an ISM Radio Frequency (RF) System redirect icon

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UPDATED 08/23/2011
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Adapting Low-Band ISM Transmitters for High-Band Operation redirect icon

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UPDATED 03/01/2012
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改造低频ISM发送器使其支持高频应用 redirect icon

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UPDATED 06/21/2012
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RFの基本 redirect icon

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UPDATED 06/29/2012
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Crystal Calculations for ISM-RF Products redirect icon

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UPDATED 09/14/2011
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PCBs Layout Guidelines for RF & Mixed-Signal redirect icon

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UPDATED 12/14/2015
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RF和混合信号PCB的一般布局指南 redirect icon

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UPDATED 02/02/2012
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RFおよびミックスドシグナルPCBレイアウトの一般的ガイドライン redirect icon

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UPDATED 01/31/2013
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Getting Started with a Radio Design redirect icon

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UPDATED 03/17/2013
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Documentation

Technical Documents 18
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Data Sheet 1

MAX7044: 300MHz to 450MHz High-Efficiency, Crystal-Based +13dBm ASK Transmitter Data Sheet (Rev.5)

Reliability Data 1

MAX7044 Reliability Data

Technical Articles 16

RF Basics Guide
Design a Crystal Oscillator to Match Your Application
Small Antennas for 300MHz to 450MHz Transmitters
Avoid PC-Layout \"Gotchas\" in ISM-RF Products
Radiated Power and Field Strength from UHF ISM Transmitters
Power Amplifier Theory for High-Efficiency Low-Cost ISM-Band Transmitters
FCC and ETSI Requirements for Short-Range UHF ASK-Modulated Transmitters
Matching Maxim's 300MHz to 450MHz Transmitters to Small Loop Antennas
Requirements of Remote Keyless Entry (RKE) Systems
Radio Link-Budget Calculations for ISM-RF Products
Flexible Configuration of the MAX7060 ASK/FSK ISM-RF Transmitter
How to Optimize an ISM Radio Frequency (RF) System
Adapting Low-Band ISM Transmitters for High-Band Operation
Crystal Calculations for ISM-RF Products
PCBs Layout Guidelines for RF & Mixed-Signal
Getting Started with a Radio Design

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX7044AKA+ Small-Outline Transistor Package external-link
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MAX7044AKA+T Small-Outline Transistor Package external-link
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  • Reliablity Data external-link

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ISM RF Receivers < 1GHz1
MAX1473
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PRODUCTION

315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range

Evaluation Kits 1

MAX7044EVKIT

Evaluation Kit for the MAX7044

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MAX7044EVKIT

Evaluation Kit for the MAX7044

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MAX7044EVKIT
Evaluation Kit for the MAX7044

Features and Benefits

  • Evaluates the MAX7044 OOK/ASK Sub-1GHz ISM Band Transmitter
  • Single Input Voltage Supply from +2.1V to +3.6V
  • Direct Interface with a MAX32630FTHR Arm  Microcontroller (MCU) Board
  • Available PMOD Hardware Interface
  • Windows 10-Compatible Software
  • GUI Controls for MAX32630FTHR Board PMIC Operation from 2.1V to 3.3V
  • Proven Two-Layer PCB Design
  • Fully Assembled and Tested
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Product Detail

The MAX7044 evaluation kit (EV kit) contains a single MAX7044 crystal-referenced phase-locked-loop (PLL) VHF/UHF transmitter designed to transmit OOK/ASK data in the 300MHz to 450MHz frequency range.

The EV kit operates alone or in conjunction with an external microcontroller (MCU) and graphical user interface (GUI) software running on a computer.

The EV kit is designed to facilitate the operation of the transmitter and provide tools for generating a data stream with a simple, one-pin data interface to the MAX7044. This EV kit is preconfigured to operate at two frequencies (315MHz or 433MHz) based on the crystal selection and the output network.

The EV kit includes Windows® 10-compatible software that provides a simple GUI that controls the on-board PMIC and can act as a data generator when the MAX32630FTHR applications platform is used.

Applications

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

Resources

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MAX7044EVKIT Gerber File Download

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MAX7044EVKIT Gerber File - Design Files Download

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Evaluation Kits1

MAX7044EVKIT

Evaluation Kit for the MAX7044

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