General Description

The MAX7030 crystal-based, fractional-N transceiver is

designed to transmit and receive ASK/OOK data at fac-

tory-preset carrier frequencies of 315MHz, 345MHz

433.92MHz with data rates up to 33kbps (Manchester

encoded) or 66kbps (NRZ encoded). This device gen-

erates a typical output power of +10dBm into a 50

Ω

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 inte-

ger-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.

Applications

2-Way Remote Keyless Entry

Security Systems

Home Automation

Remote Controls

Remote Sensing

Smoke Alarms

Garage Door Openers

Local Telemetry Systems

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)

♦ ASK/OOK Modulation

♦ +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*: -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

Low-Cost, 315MHz, 345MHz, and 433.92MHz

ASK Transceiver with Fractional-N PLL

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

19-3706; Rev 0; 5/05

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART

TEMP RANGE

PIN-PACKAGE

PKG

CODE

MAX7030_ATJ -40

°C to +125°C 32 Thin QFN-EP** T3255-3

Product Selector Guide

PART

CARRIER FREQUENCY (MHz)

MAX7030LATJ

315

MAX7030MATJ

345

MAX7030HATJ

433.92

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

**EP = Exposed paddle.

Note: The MAX7030 is available with factory-preset operating

frequencies. See the Product Selector Guide for complete part

numbers.

Pin Configuration, Typical Application Circuit, and

Functional Diagram appear at end of data sheet.