General Description

The MAX1471 low-power, CMOS, superheterodyne, RF

dual-channel receiver is designed to receive both ampli-

tude-shift-keyed (ASK) and frequency-shift-keyed (FSK)

data without reconfiguring the device or introducing any

time delay normally associated with changing modula-

tion schemes. The MAX1471 requires few external com-

ponents to realize a complete wireless RF digital data

receiver for the 300MHz to 450MHz ISM bands.

The MAX1471 includes all the active components

required in a superheterodyne receiver including: a low-

noise amplifier (LNA), an image-reject (IR) mixer, a fully

integrated phase-locked loop (PLL), local oscillator

(LO), 10.7MHz IF limiting amplifier with received-signal-

strength indicator (RSSI), low-noise FM demodulator,

and a 3V voltage regulator. Differential peak-detecting

data demodulators are included for both the FSK and

ASK analog baseband data recovery. The MAX1471

includes a discontinuous receive (DRX) mode for low-

power operation, which is configured through a serial

interface bus.

The MAX1471 is available in a 32-pin thin QFN package

and is specified over the automotive -40°C to +125°C

temperature range.

Applications

Automotive Remote Keyless Entry (RKE)

Tire Pressure Monitoring Systems

Garage Door Openers

Wireless Sensors

Wireless Keys

Security Systems

Medical Systems

Home Automation

Local Telemetry Systems

Features

♦ ASK and FSK Demodulated Data on Separate

Outputs

♦ Specified over Automotive -40°C to +125°C

Temperature Range

♦ Low Operating Supply Voltage Down to 2.4V

♦ On-Chip 3V Regulator for 5V Operation

♦ Low Operating Supply Current

7mA Continuous Receive Mode

1.1µA Deep-Sleep Mode

♦ Discontinuous Receive (DRX) Low-Power

Management

♦ Fast-On Startup Feature < 250µs

♦ Integrated PLL, VCO, and Loop Filter

♦ 45dB Integrated Image Rejection

♦ RF Input Sensitivity*

ASK: -114dBm

FSK: -108dBm

♦ Selectable IF BW with External Filter

♦ Programmable Through Serial User Interface

♦ RSSI Output and High Dynamic Range with AGC

315MHz/434MHz Low-Power, 3V/5V

ASK/FSK Superheterodyne Receiver

________________________________________________________________ Maxim Integrated Products

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MAX1471

THIN QFN

TOP VIEW

DSA+

DSA-

OPA+

DFA

XTAL2

XTAL1

8

LNAIN

25

DGND

DFF

OPF+

DSF+

DSF-

PDMAXF

17

PDMINF

16

Pin Configuration

19-3272; Rev 1; 3/05

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.

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

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX1471ATJ

-40

°C to +125°C

32 Thin QFN-EP**

**EP = Exposed pad.