December 2006

1

MICRF102

MICRF102

Micrel

MICRF102

QwikRadio™ UHF ASK Transmitter

General Description

The MICRF102 is a single chip Transmitter IC for remote

wireless applications. The device employs Micrel’s latest Qwi-

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

out” monolithic device. All antenna tuning is accomplished

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 output stage. This trans-

mitter is designed to comply with worldwide UHF unlicensed

band intentional radiator regulations.The IC is compatible with

virtually allASK/OOK (Amplitude Shift Keying/On-Off Keyed)

UHF receiver types from wide-band super-regenerative radios

to narrow-band, high performance super-heterodyne receiv-

ers. 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,

ensures that the transmitter output power stays constant for

the life of the battery.

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

the MICRF102 provides the lowest cost and most reliable

remote actuator and RF link system available.

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

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

ANTN

STBY

100k

C3

12pF 50V

(2.7pF 50V)

C2

8.2pF 50V

(4.7pF 50V)

PCB Antenna

L1

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 <0.04µA

Applications

• Remote Keyless Entry systems (RKE)

• Remote fan/light control

• Garage door opener transmitters

• Remote sensor data links

• Tire Pressure Monitoring System (TPMS)

• Telemetry

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • 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

QwikRadio™

Ordering Information

Part Number

Temperature

Range

Package

Standard

Pb-Free

MICRF102BM

MICRF102YM

-40°C to +85°C

8-Pin SOIC