MICRF104 データシートの表示（PDF） - Micrel

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MICRF104

1.8V, QwikRadio™ UHF ASK Transmitter

Micrel 

MICRF104

Micrel

MICRF104

1.8V, QwikRadio™ UHF ASK Transmitter

Final Information

General Description

The MICRF104 is a low voltage Transmitter IC for remote

wireless applications. The device employs Micrel’s latest

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

antenna-out” 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. The MICRF104 incorporates a DC/DC con-

verter to boost the input voltage up to 5V for the RF portion of

the IC. This feature enables the MICRF104 to operate off

supply voltages as low as 1.8V and transmit at power in

excess of –2dBm.

The MICRF104 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 MICRF104 provides the lowest cost and most reliable

remote actuator and RF link system available.

Features

• Complete UHF transmitter on a chip

• Frequency range 300MHz to 470MHz

• Data rates to 20kbps

• Automatic antenna alignment, no manual adjustment

• Low external part count

Applications

• Remote Keyless Entry Systems (RKE)

• Remote Fan/Light Control

• Garage Door Opener Transmitters

• Remote Sensor Data Links

Ordering Information

Part Number

MICRF104BM

Temperature Range

0°C to +85°C

Package

14-Pin SOIC

Typical Application

1.8V to 4V

Supply

10µF

RF Standby

L1

22µH

MICRF104

1 VDDPWR

EN 14

2 VSS

3

5V

4 VSS

5 REFOSC

6 RFSTBY

7 ANTM

VSS 13

12

SW

PC 11

Power

Control

0.1µF 100pF 10µF

10

VDDRF

9

ASK

ANTP 8

DATA IN

LOOP

ANTENNA

(PCB TRACE)

Figure 1

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

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

November 8, 2001

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MICRF104

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