Introduction

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 300 MHz to 450 MHz frequency range. These applications include Remote Keyless Entry (RKE) and a Tire Pressure Monitoring System (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 +10 dBm (CW) output power into a 50Ω load, while consuming 11.5 mA of supply current from a 3.0V power supply. In ASK mode, the device consumes 6.9 mA of supply current at a data rate of 1 kbps (Manchester 50%). It features a low-power shutdown mode where the device typically consumes 50 nA 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 the AEC-Q100 qualification is required, consider the MAQRF112. For ASK only applications that do not require shutdown, consider the MICRF113 in SOT23-6.