MAX7031 Low-Cost, 308MHz, 315MHz, and 433.92MHz FSK Transceiver with Fractional-N PLL

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.

Key Features

Applications/Uses

+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

	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)

I_SUPPLY
(mA)

Package/Pins

Smallest Available Pckg.
(mm²)

Price

max w/pins

See Notes

MAX7031

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

Remote Controls

Remote Sensing

Security Systems

Smoke Alarms

308 to 433.92

11.6

TQFN/32

$2.75 @1k

See All ISM RF Transceivers (9)

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

Diagram

MAX7031: Typical Application Circuit
Typical Application Circuit

Application Notes

Application Note 3395: Requirements of Remote Keyless Entry (RKE) Systems - MAX7031
Application Note 3587: FCC and ETSI Requirements for Short-Range UHF ASK-Modulated Transmitters - MAX7031
Application Note 3589: Power Amplifier Theory for High-Efficiency Low-Cost ISM-Band Transmitters - MAX7031
Application Note 3815: Radiated Power and Field Strength from UHF ISM Transmitters - MAX7031

Reliability Reports

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Underwriters Laboratories (UL®) Recognized

Software/Models

none

Ordering Information

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
* 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: 1-12 of 12

MAX7031 Free
Sample Buy Status

Package: TYPE PINS FOOTPRINT

DRAWING CODE/VAR *

Temp RoHS/Lead-Free?
Materials Analysis

MAX7031EVKIT-315

Active

Land Pattern: Not Available

See data sheet

MAX7031EVKIT-433

Active

Land Pattern: Not Available

See data sheet

MAX7031LATJ+

Active TQFN;32 pin;26 mm²
Outline Drawing: 21-0140 (PDF)
Land Pattern: 90-0001 (PDF)
Use pkgcode/variation: T3255+3*
-40°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis

MAX7031LATJ+T

Active

Land Pattern: Not Available

-40°C to +125°C See data sheet

MAX7031MATJ50+

Active TQFN;32 pin;26 mm²
Outline Drawing: 21-0140 (PDF)
Land Pattern: 90-0001 (PDF)
Use pkgcode/variation: T3255+3*
-40°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis

MAX7031MATJ50+T

Active

Land Pattern: Not Available

-40°C to +125°C See data sheet

MAX7031HATJ17

Active TQFN;32 pin;26 mm²
Outline Drawing: 21-0140 (PDF)
Land Pattern: 90-0001 (PDF)
Use pkgcode/variation: T3255-3*
-40°C to +125°C RoHS/Lead-Free: No
Materials Analysis

MAX7031HATJ17-T

Active

Land Pattern: Not Available

-40°C to +125°C See data sheet

MAX7031HATJ17+

Active TQFN;32 pin;26 mm²
Outline Drawing: 21-0140 (PDF)
Land Pattern: 90-0001 (PDF)
Use pkgcode/variation: T3255+3*
-40°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis

MAX7031HATJ17+T

Active

Land Pattern: Not Available

-40°C to +125°C See data sheet

MAX7031HATJ51+

Active TQFN;32 pin;26 mm²
Outline Drawing: 21-0140 (PDF)
Land Pattern: 90-0001 (PDF)
Use pkgcode/variation: T3255+3*
-40°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis

MAX7031HATJ51+T

Active TQFN;32 pin;26 mm²
Outline Drawing: 21-0140 (PDF)
Land Pattern: 90-0001 (PDF)
Use pkgcode/variation: T3255+3*
-40°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis

More Information

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Related Products

MAX7030 Low-Cost, 315MHz, 345MHz, and 433.92MHz ASK Transceiver with Fractional-N PLL
MAX7032 Low-Cost, Crystal-Based, Programmable, ASK/FSK Transceiver with Fractional-N PLL

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Document Ref.: 19-3707; Rev 1; 2008-09-30
This page last modified: 2009-08-04