MICRF112

300MHz to 450MHz, +10dBm, 1.8V to 3.6V,

ASK/FSK Transmitter with Shutdown

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

February 2013

M9999-020713

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.

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

Typical Application