MICRF112
300MHz to 450MHz, +10dBm, 1.8V to 3.6V,
ASK/FSK Transmitter with Shutdown
General Description Features
The MICRF112 is a high-performance, easy to use, true
1.8V to 3.6V supply voltage range
Data-In, RF-Out, ASK/FSK, phase-locked loop (PLL)
Up to +10dBm output power (CW)
based, transmitter IC for applications in the 300MHz to
6.9mA supply current at 1kbps ASK (50% Manchester)
450MHz frequency range. These applications include
11.5mA supply current at +10dBm (FSK/CW)
remote keyless entry (RKE) and tire pressure monitoring
(TPMS). The device needs only a low-cost crystal to 1A shutdown supply current
precisely set the desired RF frequency, and a few external
Data rates up to 50kbps ASK, 10kbps FSK
components for matching the power amplifier output to the
Crystal or ceramic resonators sets RF frequency
antenna.
40C to +125C temperature range
The MICRF112 operates over the 1.8V to 3.6V operating
10-pin MSOP (3.0mm x 4.9mm)
range and delivers +10dBm (CW) output power into a 50
10-pin Ultra-Thin DFN (2mm x 2mm x 0.4mm)
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
Applications
(Manchester 50%). It features a low-power shutdown
mode in which the device typically consumes 50nA of
Remote keyless entry systems (RKE)
supply current. This makes it an ideal solution for battery
Remote control (STB, HVAC, and appliances)
powered applications.
Garage door openers (GDO)
The MICRF112 is rated for the 40C to +125C
Tire pressure monitor systems (TPMS)
temperature range, and is available in 10-pin MSOP and
Outdoor weather stations
10-pin Ultra-Thin DFN packages. For automotive
applications, where AEC-Q100 qualification is required, Security/Alarm systems
consider the MAQRF112. For ASK-only applications that
Lighting and fan remote controls
do not require shutdown, consider the MICRF113 in
Doorbells
SOT23-6.
Irrigation control
Datasheets and support documentation can be found on
Micrels website at: www.micrel.com.
Typical Application
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 Micrel, Inc. MICRF112
Ordering Information
Part Number Top Mark Temp. Range Package
MICRF112YMM RF112YMM 40C to +125C 10-Pin MSOP
MICRF112YMU 12B 40C to +125C 10-Pin UTDFN
Pin Configuration
10-Pin Ultra-Thin DFN (MU)
10-Pin MSOP (MM)
(2mm x 2mm x 0.4mm)
Top View
Top View
Note: The Pin1 marking symbol could be a circle, triangle, or other symbol.
Pin Description
Pin Number Pin Name Pin Function
1 ASK ASK Data input
2 XTLIN Reference oscillator input connection
3 XTLOUT Reference oscillator output connection
4 VSS Ground
5 XTAL_MOD Reference oscillation modulation port for FSK operation
6 FSK FSK Data input
7 EN Chip enable, active high
8 VSSPA PA ground
9 PAOUT PA output
10 VDD Positive power supply
M9999-020713
February 2013 2