MAX1479(2004) 查看數據表（PDF） - Maxim Integrated

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MAX1479
(Rev.:2004)

300MHz to 450MHz Low-Power, Crystal-Based +10dBm ASK/FSK Transmitter

Maxim Integrated 

19-3353; Rev 0; 8/04

300MHz to 450MHz Low-Power,

Crystal-Based +10dBm ASK/FSK Transmitter

General Description

The MAX1479 crystal-referenced phase-locked-loop

(PLL) VHF/UHF transmitter is designed to transmit ASK,

OOK, and FSK data in the 300MHz to 450MHz frequency

range. The MAX1479 supports data rates up to 100kbps

in ASK mode and 20kbps in FSK mode (both

Manchester coded). The device provides an adjustable

output power of more than +10dBm into a 50Ω load. The

crystal-based architecture of the MAX1479 eliminates

many of the common problems of SAW-based transmit-

ters by providing greater modulation depth, faster fre-

quency settling, higher tolerance of the transmit

frequency, and reduced temperature dependence.

These improvements enable better overall receiver per-

formance when using the MAX1479 together with a

superheterodyne receiver such as the MAX1470,

MAX1471, MAX1473, or MAX7033.

The MAX1479 is available in a 16-pin thin QFN pack-

age (3mm x 3mm) and is specified for the automotive

temperature range from -40°C to +125°C.

Applications

Remote Keyless Entry

Tire Pressure Monitoring

Security Systems

Radio-Controlled Toys

Wireless Game Consoles

Wireless Computer Peripherals

Wireless Sensors

RF Remote Controls

Garage Door Openers

Functional Diagram

Features

♦ ETSI-Compliant EN300 220

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

♦ Supports ASK, OOK, and FSK Modulations

♦ Adjustable FSK Shift

♦ +10dBm Output Power into 50Ω Load

♦ Low Supply Current (6.7mA in ASK Mode,

and 10.5mA in FSK Mode)

♦ Uses Small Low-Cost Crystal

♦ Small 16-Pin Thin QFN Package

♦ Fast-On Oscillator—200µs Startup Time

♦ Programmable Clock Output

Ordering Information

PART

TEMP RANGE

MAX1479ATE

-40°C to +125°C

*EP = Exposed paddle.

PIN-PACKAGE

16 Thin QFN-EP*

Typical Application Circuit appears at end of data sheet.

Pin Configuration

16

15

14

13

VDD 1

MODE 2

DIN 3

ENABLE 4

CRYSTAL

DRIVER

PD/CP

DEVIATION

LOOP

FILTER

ASK

FSK

DIVIDE

BY 32

VCO

MAX1479

PA

CLOCK

DIVIDER

ENVELOPE

SHAPING

12 DEV1

11 DEV0

10 CLK1

9 CLK0

5

6

7

8

TOP VIEW

VDD 1

MODE 2

DIN 3

ENABLE 4

16 15 14 13

MAX1479

EP

12 DEV1

11 DEV0

10 CLK1

9 CLK0

5678

THIN QFN

(3mm x 3mm)

________________________________________________________________ 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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