MAX7044(2004) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX7044
(Rev.:2004)

300MHz to 450MHz High-Efficiency, Crystal-Based +13dBm ASK Transmitter

Maxim Integrated 

19-3221; Rev 0; 1/04

EVAALVUAAILTAIOBNLEKIT

300MHz to 450MHz High-Efficiency,

Crystal-Based +13dBm ASK Transmitter

General Description

The MAX7044 crystal-referenced phase-locked-loop

(PLL) VHF/UHF transmitter is designed to transmit

OOK/ASK data in the 300MHz to 450MHz frequency

range. The MAX7044 supports data rates up to 100kbps,

and provides output power up to +13dBm into a 50Ω

load while only drawing 7.7mA at 2.7V.

The crystal-based architecture of the MAX7044 elimi-

nates many of the common problems with SAW-based

transmitters by providing greater modulation depth,

faster frequency settling, higher tolerance of the trans-

mit frequency, and reduced temperature dependence.

The MAX7044 also features a low supply voltage of

+2.1V to +3.6V. These improvements enable better

overall receiver performance when using the MAX7044

together with a superheterodyne receiver such as the

MAX1470 or MAX1473.

A simple, single-input data interface and a buffered

clock-out signal at 1/16th the crystal frequency make

the MAX7044 compatible with almost any microcon-

troller or code-hopping generator.

The MAX7044 is available in an 8-pin SOT23 package

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

temperature range.

Applications

Remote Keyless Entry (RKE)

Tire-Pressure Monitoring (TPM)

Security Systems

Garage Door Openers

RF Remote Controls

Wireless Game Consoles

Wireless Computer Peripherals

Wireless Sensors

Typical Application Circuit

Features

♦ +2.1V to +3.6V Single-Supply Operation

♦ OOK/ASK Transmit Data Format

♦ Up to 100kbps Data Rate

♦ +13dBm Output Power into 50Ω Load

♦ Low 7.7mA (typ) Operating Supply Current*

♦ Uses Small, Low-Cost Crystal

♦ Small 3mm x 3mm 8-Pin SOT23 Package

♦ Fast-On Oscillator: 250µs Startup Time

* At 50% duty cycle (315MHz, 2.7V supply, +13dBm

output power)

Ordering Information

PART

TEMP RANGE

PIN-

PACKAGE

TOP MARK

MAX7044AKA-T -40°C to +125°C 8 SOT23-8

AEJW

Pin Configuration

100nF

220pF

ANTENNA

3.0V

680pF

fXTAL

1

8

XTAL1 XTAL2

2

GND

7

VDD

3 MAX7044 6

PAGND DATA

4

5

PAOUT CLKOUT

3.0V

100nF

DATA INPUT

CLOCK

OUTPUT

(fCLKOUT =

fXTAL/16)

TOP VIEW

XTAL1 1

GND 2

PAGND 3

PAOUT 4

MAX7044

8 XTAL2

7 VDD

6 DATA

5 CLKOUT

SOT23

________________________________________________________________ Maxim Integrated Products 1

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.

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