MAX7031

Low-Cost, 308MHz, 315MHz, and 433.92MHz FSK Transceiver with Fractional-N PLL

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Status Explanations for product status codes

Active: In Production.

Description

The MAX7031 crystal-based, fractional-N transceiver is designed to transmit and receive FSK data at factory-preset carrier frequencies of 308MHz, 315MHz, or 433.92MHz 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 sensitivity of -110dBm. The MAX7031 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 MAX7031 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 is preset to be 10.7MHz above the receive LO. 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 MAX7031 transmit PLL allows the transmit FSK signal to be preset 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 MAX7031 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.

Data Sheet

Download this datasheet in PDF formatDownload Rev 3 (PDF, 236kB)
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Key Features

  • +2.1V to +3.6V or +4.5V to +5.5V Single-Supply Operation
  • Single-Crystal Transceiver
  • Factory-Preset Frequency (No Serial Interface Required)
  • FSK Modulation
  • Factory-Preset FSK Frequency Deviation
  • +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*: -110dBm
  • Selectable IF Bandwidth with External Filter
  • RSSI Output with High Dynamic Range
  • < 12.5mA Transmit-Mode Current
  • < 6.7mA Receive-Mode Current
  • < 800nA Shutdown Current
  • Fast-On Startup Feature, < 250µs
  • Small, 32-Pin, Thin QFN Package
  • Underwriters Laboratories (UL) Recognized
 

Applications/Uses

  • 2-Way Remote Keyless Entry
  • Garage Door Openers
  • Home Automation
  • Local Telemetry Systems
  • Remote Controls
  • Remote Sensing
  • Security Systems
  • Smoke Alarms
   

Key Specifications:

ISM RF Transceivers
Part Number Solutions Features Applications Freq.
(MHz)
ISUPPLY
(mA)
Footprint
(mm x mm)
MAX7031 
Automotive
ISM, RKE, SRD; 315-433.92MHz Bands
Remote Controls
Remote Sensing
Security Systems
Smoke Alarms
+10dBm Output Power into 50Ω Load
FSK Modulation
Factory-Preset Frequency
Integrated Tx/Rx Switch
Single-Crystal Transceiver
AMR
ISM
Remote Controls
Remote Sensing
Security Systems
Smoke Alarms
308 to 433.92 11.6 5.0 x 5.0
See All ISM RF Transceivers (9)

Pricing 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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.



*0.2% BER, 4kbps Manchester-encoded data, 280kHz IF BW

Diagram

MAX7031: Typical Application Circuit
Typical Application Circuit

Technical Documents

App Note 3395  Requirements of Remote Keyless Entry (RKE) Systems
App Note 3587  FCC and ETSI Requirements for Short-Range UHF ASK-Modulated Transmitters
App Note 3589  Power Amplifier Theory for High-Efficiency Low-Cost ISM-Band Transmitters
App Note 3815  Radiated Power and Field Strength from UHF ISM Transmitters
Tutorial 4636  Avoid PC-Layout "Gotchas" in ISM-RF Products
Tutorial 4686  Important Design Considerations for Heart-Rate and Fitness Monitors
Tutorial 4691  Introduction to Hearing Aids and Important Design Considerations
Tutorial 5100  General Layout Guidelines for RF and Mixed-Signal PCBs
App Note 5142  Radio Link-Budget Calculations for ISM-RF Products
Tutorial 5265  Design a Crystal Oscillator to Match Your Application
Tutorial 5300  RF Basics
App Note 5417  How to Optimize an ISM Radio Frequency (RF) System
Tutorial 5422  Crystal Calculations for ISM-RF Products
Tutorial 5426  Baseband Calculations for ISM-RF Receivers
Tutorial 5428  Squelch in ISM-RF Receivers

Reliability Reports

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Underwriters Laboratories (UL) Recognized

Ordering Information

Filters: Part Number Package: Temperature: Tape and Reel Sample
Part Number Free
Sample
Buy Status Explanations for product status codes Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR *
Temp RoHS/Lead-Free?
Materials Analysis
MAX7031EVKIT-315    
Active KIT;
See data sheet
MAX7031EVKIT-433    
Active KIT;
See data sheet
MAX7031HATJ17    
Active TQFN;32 pin;26 mm²
-40°C to +125°C RoHS/Lead-Free: No
Materials Analysis
MAX7031HATJ17+  
Active TQFN;32 pin;26 mm²
-40°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX7031HATJ17+T    
Active QFN;32 pin
-40°C to +125°C See data sheet
MAX7031HATJ17-T    
Active QFN;32 pin
-40°C to +125°C See data sheet
MAX7031HATJ51+  
Active TQFN;32 pin;26 mm²
-40°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX7031HATJ51+T    
Active TQFN;32 pin;26 mm²
-40°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX7031LATJ+    
Active TQFN;32 pin;26 mm²
-40°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX7031LATJ+T    
Active QFN;
-40°C to +125°C See data sheet
Part Number Free
Sample
Buy Status Explanations for product status codes Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR *
Temp RoHS/Lead-Free?
Materials Analysis
MAX7031MATJ50+  
Active TQFN;32 pin;26 mm²
-40°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX7031MATJ50+T    
Active QFN;
-40°C to +125°C See data sheet

Notes:
  1. Other options and links for purchasing parts are listed at: http://www.maximintegrated.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; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product 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.

Similar Products by Function

MAX7032 Low-Cost, Crystal-Based, Programmable, ASK/FSK Transceiver with Fractional-N PLL
MAX7030 Low-Cost, 315MHz and 433.92MHz ASK Transceiver with Fractional-N PLL
See All ISM RF Transceivers (9Products)

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Information Index

Document Ref.: 19-3707 Rev 3; 2011-01-21
This page last modified: 2011-04-05