MICRF112_13 Datasheet, PDF (1/21 Pages) Micrel Semiconductor – 300MHz to 450MHz, +10dBm, 1.8V to 3.6V, ASK/FSK Transmitter with Shutdown

MICRF112
300MHz to 450MHz, +10dBm, 1.8V to 3.6V,
ASK/FSK Transmitter with Shutdown
General Description
The MICRF112 is a high-performance, easy to use, true
“Data-In, RF-Out,” ASK/FSK, phase-locked loop (PLL)
based, transmitter IC for applications in the 300MHz to
450MHz frequency range. These applications include
remote keyless entry (RKE) and tire pressure monitoring
(TPMS). The device needs only a low-cost crystal to
precisely set the desired RF frequency, and a few external
components for matching the power amplifier output to the
antenna.
The MICRF112 operates over the 1.8V to 3.6V operating
range and delivers +10dBm (CW) output power into a 50Ω
load, while consuming 11.5mA of supply current from a
3.0V power supply. In ASK mode, the device consumes
6.9mA of supply current at a data rate of 1kbps
(Manchester 50%). It features a low-power shutdown
mode in which the device typically consumes 50nA of
supply current. This makes it an ideal solution for battery
powered applications.
The MICRF112 is rated for the −40°C to +125°C
temperature range, and is available in 10-pin MSOP and
10-pin Ultra-Thin DFN packages. For automotive
applications, where AEC-Q100 qualification is required,
consider the MAQRF112. For ASK-only applications that
do not require shutdown, consider the MICRF113 in
SOT23-6.
Datasheets and support documentation can be found on
Micrel’s website at: www.micrel.com.
Typical Application
Features
• 1.8V to 3.6V supply voltage range
• Up to +10dBm output power (CW)
• 6.9mA supply current at 1kbps ASK (50% Manchester)
• 11.5mA supply current at +10dBm (FSK/CW)
• 1µA shutdown supply current
• Data rates up to 50kbps ASK, 10kbps FSK
• Crystal or ceramic resonators sets RF frequency
• −40°C to +125°C temperature range
• 10-pin MSOP (3.0mm x 4.9mm)
• 10-pin Ultra-Thin DFN (2mm x 2mm x 0.4mm)
Applications
• Remote keyless entry systems (RKE)
• Remote control (STB, HVAC, and appliances)
• Garage door openers (GDO)
• Tire pressure monitor systems (TPMS)
• Outdoor weather stations
• Security/Alarm systems
• Lighting and fan remote controls
• Doorbells
• Irrigation control
QwikRadio is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
February 2013
M9999-020713