MAX7030 Low-Cost, 315MHz, 345MHz, and 433.92MHz ASK Transceiver with Fractional-N PLL

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The MAX7030 crystal-based, fractional-N transceiver is designed to transmit and receive ASK/OOK data at factory- preset carrier frequencies of 315MHz, 345MHz^†, 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 50

load, and exhibits typical sensitivity of -114dBm. The MAX7030 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 MAX7030 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. 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 MAX7030 is available in a small, 5mm x 5mm, 32- pin thin QFN package, and is specified to operate over the automotive -40°C to +125°C temperature range.

^†Consult factory for availability.

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)
	ASK/OOK Modulation
	+10dBm Output Power into 50 Load
	Integrated TX/RX Switch
	Integrated Transmit and Receive PLL, VCO, and Loop Filter
	> 45dB Image Rejection
	Typical RF Sensitivity*: -114dBm
	Selectable IF Bandwidth with External Filter
	< 12.5mA Transmit-Mode Current
	< 6.7mA Receive-Mode Current
	< 800nA Shutdown Current
	Fast-On Startup Feature, <250µs
	Small, 32-Pin, Thin QFN Package *0.2% BER, 4kbps Manchester-encoded data, 280kHz IF BW

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

Key Specifications: RF Transceivers

Part Number

Solutions

Features

Applications

Frequency Range (MHz)

Supply Current (mA)

Footprint (mm x mm)

Package

Smallest Available Package (max w/pins) (mm²)

RoHS Available

Price^**

MAX7030

Automotive
ISM, RKE, SRD; 315-433.92MHz Bands

•	+10dBm Output Power into 50 Ohm Load

•	+2.1V to +3.6V or +4.5V to +5.5V Single-Supply

•	> 45dB Image Rejection

•	ASK/OOK Modulation

•	Factory-Preset Frequency

•	Integrated Tx/Rx Switch

•	Small, 5x5, 32-Pin, Thin QFN Package

•	Typical RF Sensitivity: -114dBm

•

ISM

300 to 450

Rx: <6.7
Tx <12.5

5.0 x 5.0

THIN QFN/32

Yes

$2.75 @ 1k

See All RF Transceivers (18)

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.