MAX7032
Low-Cost, Crystal-Based, Programmable, ASK/FSK Transceiver with Fractional-N PLL
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Overview
Features and Benefits
- +2.1V to +3.6V or +4.5V to +5.5V Single-Supply Operation
- Single Crystal Transceiver
- User-Adjustable 300MHz to 450MHz Carrier Frequency
- ASK/OOK and FSK Modulation
- User-Adjustable FSK Frequency Deviation Through Fractional-N PLL Register
- Agile Transmitter Frequency Synthesizer with fXTAL/4096 Carrier-Frequency Spacing
- +10dBm Output Power into 50Ω Load
- Integrated TX/RX Switch
- Integrated Transmit and Receive PLL, VCO, and Loop Filter
- > 45dB Image Rejection
- Typical RF Sensitivity*
- ASK: -114dBm
- FSK: -110dBm
- Selectable IF Bandwidth with External Filter
- RSSI Output with High Dynamic Range
- Autopolling Low-Power Management
- < 12.5mA Transmit-Mode Current
- < 6.7mA Receive-Mode Current
- < 23.5µA Polling-Mode Current
- < 800nA Shutdown Current
- Fast-On Startup Feature, < 250µs
- Small 32-Pin, Thin QFN Package
Product Details
The MAX7032 crystal-based, fractional-N transceiver is designed to transmit and receive ASK/OOK or FSK data in the 300MHz to 450MHz frequency range with data rates up to 33kbps (Manchester encoded) or 66kbps (NRZ encoded). This device generates a typical output power of +10dBm into a 50Ω load, and exhibits typical sensitivities of -114dBm for ASK data and -110dBm for FSK data. The MAX7032 features separate transmit and receive pins (PAOUT and LNAIN) and provides an internal RF switch that can be used to connect the transmit and receive pins to a common antenna.
The MAX7032 transmit frequency is generated by a 16-bit, fractional-N, phase-locked loop (PLL), while the receiver's local oscillator (LO) is generated by an integer-N PLL. This hybrid architecture eliminates the need for separate transmit and receive crystal reference oscillators because the fractional-N PLL allows the transmit frequency to be set within 2kHz of the receive frequency. The 12-bit resolution of the fractional-N PLL allows frequency multiplication of the crystal frequency in steps of fXTAL/4096. Retaining the fixed-N PLL for the receiver avoids the higher current drain requirements of a fractional-N PLL and keeps the receiver current drain as low as possible.
The fractional-N architecture of the MAX7032 transmit PLL allows the transmit FSK signal to be programmed for exact frequency deviations, and completely eliminates the problems associated with oscillator-pulling FSK signal generation. All frequency-generation components are integrated on-chip, and only a crystal, a 10.7MHz IF filter, and a few discrete components are required to implement a complete antenna/digital data solution.
The MAX7032 is available in a small 5mm x 5mm, 32-pin, thin QFN package, and is specified to operate in the automotive -40°C to +125°C temperature range.
Applications
- 2-Way Remote Keyless Entry
- Garage Door Openers
- Home Automation
- Local Telemetry Systems
- Remote Controls
- Remote Sensing
- Security Systems
- Smoke Alarms
Product Categories
Product Lifecycle
Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (2)
Documentation & Resources
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How to Optimize an ISM Radio Frequency (RF) System10/1/2012
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Design a Crystal Oscillator to Match Your Application9/18/2012
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Crystal Calculations for ISM-RF Products6/29/2012
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Squelch in ISM-RF Receivers6/25/2012
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Baseband Calculations for ISM-RF Receivers6/20/2012
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RF Basics Guide4/12/2012
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Radio Link-Budget Calculations for ISM-RF Products11/2/2011
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PCBs Layout Guidelines for RF & Mixed-Signal9/14/2011
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Avoid PC-Layout \"Gotchas\" in ISM-RF Products4/12/2011
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Tutorial: Improve Sensor Performance and SNR in Pulse Oximeter Designs6/21/2010
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Important Design Considerations for Heart-Rate and Fitness Monitors5/10/2010
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Introduction to Hearing Aids and Important Design Considerations5/10/2010
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Radiated Power and Field Strength from UHF ISM Transmitters3/1/2007
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Data Slicing Techniques for UHF ASK Receivers12/22/2005
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Power Amplifier Theory for High-Efficiency Low-Cost ISM-Band Transmitters9/8/2005
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Requirements of Remote Keyless Entry (RKE) Systems2/16/2005
Tools & Simulations
Design Tools
XLS
ISM-RF Baseband Calculator
202.5 K
ISM-RF Crystal Calculator workbook is a tool for properly selecting and configuring the reference oscillator for various industrial/scientific/medical radios.
Software Development
Reference Designs (3)
Design Resources
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List Pricing
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