Rainbow-electronics MAX7044 Uživatelský manuál stáhnout pdf

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

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)

MAX7044

300MHz to 450MHz High-Efficiency,

Crystal-Based +13dBm ASK Transmitter

________________________________________________________________ Maxim Integrated Products 1

DATA

CLKOUTPAOUT

XTAL2

GND

PAGND

XTAL1

SOT23

TOP VIEW

MAX7044

Pin Configuration

Ordering Information

MAX7044

XTAL1

ANTENNA

3.0V

680pF

220pF

100nF

XTAL2

XTAL

GND

PAGND

DATA INPUT

CLOCK

OUTPUT

CLKOUT

XTAL

/16)

DATA

PAOUT

CLKOUT

Typical Application Circuit

19-3221; Rev 0; 1/04

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.

EVALUATION KIT

AVAILABLE

PART

TEMP RANGE

PIN-

PACKAGE

TOP MARK

MAX7044AKA-T

-40°C to +125°C 8 SOT23-8

AEJW

1 2 3 4 5 6 7 8 9

Shrnutí obsahu

Strany 1 - TOP VIEW

General DescriptionThe MAX7044 crystal-referenced phase-locked-loop(PLL) VHF/UHF transmitter is designed to transmitOOK/ASK data in the 300MHz to 450M

Strany 2 - ELECTRICAL CHARACTERISTICS

MAX7044300MHz to 450MHz High-Efficiency,Crystal-Based +13dBm ASK Transmitter2 ________________________________________________________________________

Strany 3

MAX7044300MHz to 450MHz High-Efficiency,Crystal-Based +13dBm ASK Transmitter__________________________________________________________________________

Strany 4 - = +2.7V, T

MAX7044300MHz to 450MHz High-Efficiency,Crystal-Based +13dBm ASK Transmitter4 ________________________________________________________________________

Strany 5

MAX7044300MHz to 450MHz High-Efficiency,Crystal-Based +13dBm ASK Transmitter__________________________________________________________________________

Strany 6 - Functional Diagram

Detailed DescriptionThe MAX7044 is a highly integrated ASK transmitteroperating over the 300MHz to 450MHz frequencyband. The IC requires only a few ex

Strany 7 - Applications Information

a 315MHz RF frequency and 4.84ms for a 433MHz RFfrequency. For other frequencies, calculate the waittime with the following equation:where tWAITis the

Strany 8 - Chip Information

MAX7044quency, thus introducing an error in the reference fre-quency. Crystals designed to operate with higher differ-ential load capacitance always p

Strany 9 - Package Information

MAX7044300MHz to 450MHz High-Efficiency,Crystal-Based +13dBm ASK TransmitterMaxim cannot assume responsibility for use of any circuitry other than cir

Komentáře k této Příručce

Žádné komentáře

Rainbow-electronics MAX7044 Uživatelský manuál

Procházejte online nebo si stáhněte Uživatelský manuál pro Počítačové příslušenství Rainbow-electronics MAX7044. Rainbow Electronics MAX7044 User Manual Uživatelská příručka

Shrnutí obsahu

Komentáře k této Příručce

Související produkty a manuály pro Počítačové příslušenství Rainbow-electronics MAX7044