MICRF112
QwikRadio
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UHF ASK/FSK Transmitter
QwikRadio is a registered trademark of Micrel, Inc.
Micrel Inc. " 2180 Fortune Drive " San Jose, CA 95131 " USA " tel +1 (408) 944-0800 " fax + 1 (408) 474-1000 " http://www.micrel.com
December 2011
M9999-120911
(408) 944-0800
General Description
The MICRF112 is a high performance, easy to use, single
chip ASK / FSK Transmitter IC for remote wireless
applications in the 300 to 450MHz frequency band. This
transmitter IC is a true data-in, antenna-out monolithic
device.
MICRF112 is high performance in three areas: power
delivery, operating voltage, and operating temperature. In
terms of power, the MICRF112 is capable of delivering +10
dBm into a 50& load. This power level enables a small
form factor transmitter (lossy antenna) such as a key fob
transmitter to operate near the maximum limit of
transmission regulations. In terms of operating voltage,
the MICRF112 operates from 3.6V to 1.8V. Many
transmitter ICs in the same frequency band stop operating
below 2.0V. The MICRF112 will work with most batteries
to the end of their useful limits. In terms of operating
temperature, the MICRF112 operates from -40癈 to
+125癈. This wide operating temperature range makes
MICRF112 an ideal candidate for the demanding
applications such as a tire pressure monitoring system.
The MICRF112 is easy to use. One only needs a
reference frequency (RF carrier frequency divided by 32
times) generated from a crystal with a few additional
external parts to create a complete versatile transmitter.
The MICRF112 operates with ASK/OOK (Amplitude Shift
Keying/On-Off Keyed) UHF receiver types from wide-band
super-regenerative radios to narrow-band, high
performance super-heterodyne receivers. The
MICRF112s maximum ASK data rate is 50kbps
(Manchester Encoding). It operates with FSK receivers as
well. The chip is designed to support narrow band FSK
(Frequency Shift Modulation) by switching an external
capacitor in parallel with the reference crystal. The
MICRF112s maximum FSK data rate is 10kbps.
Features
? Complete UHF transmitter
? Frequency range 300MHz to 450MHz
?Data rates up to 50kbps ASK, 10kbps FSK
? Output Power to 10dBm
? Low external part count
? Low standby current <1礎
? Low voltage operation (down to 1.8V)
? Operate with crystals or ceramic resonators
Applications
? Remote Keyless Entry Systems (RKE)
? Remote Control (STB, HVAC and Appliances)
? Garage Door Opener Transmitters
? Remote Sensor Data Links
? Infrared Transmitter Replacement
? Tire Pressure Monitor System (TPMS)
Ordering Information
Part Number
Temp. Range
Package
MICRF112YMM10
40癈 to +125癈
10-Pin MSOP
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