MAQRF112 Datasheet, PDF (1/15 Pages) Micrel Semiconductor – Automotive, 300MHz to 450MHz, +10dBm, 1.8V to 3.6V, ASK/FSK Transmitter with Shutdown

MAQRF112
Automotive, 300MHz to 450MHz,
+10dBm, 1.8V to 3.6V, ASK/FSK
Transmitter with Shutdown
General Description
The MAQRF112 is a high-performance, easy to use, true
“Data-In, RF-Out”, ASK/FSK, phase-locked loop (PLL)
based, transmitter IC for automotive applications in the
300MHz to 450MHz frequency range. These applications
include remote keyless entry (RKE) and tire pressure
monitoring systems (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 MAQRF112 operates over the 1.8V to 3.6V operating
range. It 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 MAQRF112 is Automotive Qualified (AEC-Q100) and
is rated to operate over the –40°C to +125°C temperature
range. For non-automotive applications that do not require
AEC-Q100 qualification, consider the MICRF112. For
ASK-only applications that do not require shutdown,
consider the MICRF113 in SOT23-6.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Typical Application
Features
• AEC-Q100 Automotive Qualified
• 300MHz to 450MHz frequency range
• Data rates up to 50kbps ASK/10kbps FSK
• 1.8V to 3.6V operating voltage range
• +10dBm output power (CW) at 3.0V
• 11.5mA of supply current at +10dBm (CW)
• 6.9mA of supply current at 1kbps (ASK, Manchester)
• 50nA supply current in shutdown mode
• Needs only one crystal to set the desired RF frequency
• –40˚C to +125˚C operating temperature range
• 10-pin MSOP package (4.9mm x 3.0mm)
Applications
• Remote keyless entry systems (RKE)
• Tire pressure monitoring systems (TPMS)
Ordering Information
Part Number
MAQRF112YMM
Temp. Range
–40°C to +125°C
Package
10-Pin MSOP
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
February 7, 2013
Revision 1.0