September 2002

1

MICRF102

MICRF102

Micrel

MICRF102

QwikRadio™ UHF ASK Transmitter

Final Information

General Description

The MICRF102 is a single chip Transmitter IC for remote

wireless applications. The device employs Micrel’s latest

QwikRadio™ technology. This device is a true “data-in,

antenna-out” monolithic device. All antenna tuning is accom-

plished automatically within the IC which eliminates manual

tuning, and reduces production costs. The result is a highly

reliable yet extremely low cost solution for high volume

wireless applications. Because the MICRF102 is a true

single-chip radio transmitter, it is easy to apply, minimizing

design and production costs, and improving time to market.

The MICRF102 uses a novel architecture where the external

loop antenna is tuned to the internal UHF synthesizer. This

transmitter is designed to comply worldwide UHF unlicensed

band intentional radiator regulations. The IC is compatible

with virtually all ASK/OOK (Amplitude Shift Keying/On-Off

Keyed) UHF receiver types from wide-band super-regenera-

tive radios to narrow-band, high performance super-hetero-

dyne receivers. The transmitter is designed to work with

transmitter data rates from 100 to 20k bits per second.

The automatic tuning in conjunction with the external resistor,

insures that the transmitter output power stays constant for

the life of the battery.

When coupled with Micrel’s family of QwikRadio™ receivers,

the MICRF102 provides the lowest cost and most reliable

remote actuator and RF link system available.

Typical Application

PC

VDD

VSS

REFOSC

ASK

MICRF102

ASK DATA INPUT

RP2

6.8k

0.1

µF

4.7

µF

RP1

100k

+5V

+5V

Y1

ANTP

ANTM

STBY

LOOP

ANTENNA

(PCB TRACE)

100k

Figure 1

Features

• Complete UHF transmitter on a monolithic chip

• Frequency range 300MHz to 470MHz

• Data rates to 20kbps

• Automatic antenna alignment, no manual adjustment

• Low external part count

• Low standby current <0.04

µA

Applications

• Remote Keyless Entry Systems (RKE)

• Remote Fan/Light Control

• Garage Door Opener Transmitters

• Remote Sensor Data Links

Ordering Information

Part Number

Temperature Range

Package

MICRF102BM

–0

°C to +85°C

8-Pin SOIC

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

QwikRadio is a trademark of Micrel, Inc. The QwikRadio ICs were developed under a partnership agreement with AIT of Orlando, Florida