1. Overview: The MICRF113

️· What it is: A 300-450MHz ASK (Amplitude Shift Keying) transmitter in a SOT23 package.
️· Function: Designed for low-power, short-range wireless communication.
️· Output Power: +10dBm (approximately 12.5mW)
️· Application: Suitable for applications like remote controls, wireless sensors, and similar low-bandwidth wireless systems.

2. Key Features & Specifications

️· Frequency Range: 300 MHz to 450 MHz.
️· Modulation: ASK (Amplitude Shift Keying) – Simple on/off keying for transmitting data.
️· Package: SOT23 (Surface Mount Technology package) – Very small and suitable for automated assembly.
️· Supply Voltage: (Not explicitly stated in this document, but assumed to be a typical voltage for SOT23 devices).
️· Low Power Consumption: (Implied – suitable for battery-powered applications).

3. PCB Layout & Antenna

️· 50Ω Test Board: The document includes PCB layout recommendations and drawings for a 50-ohm test board, which is important for characterizing the transmitter's performance. The drawings provide guidance for component placement and trace routing.
️· Antenna: The PCB includes an integrated PCB antenna (L5).
️· Importance of Layout: Proper PCB layout is critical for good performance, especially with integrated antennas.

4. Bill of Materials (BOM)

The document provides two separate BOM lists: one for 315 MHz operation, and one for the 433.92 MHz operation.

315 MHz BOM Highlights:

️· Crystal: SA-9.84375-F-10-J-30-30-x (9.84375 MHz)
️· Inductor: 0805CS-471XJB (470nH)
️· Resistor: CRC06030000Z0EA (0 Ohms)

433.92 MHz BOM Highlights:

️· Crystal: SA-13.5600-F-10-J-30-30-x (13.5600 MHz)
️· Inductor: 0805CS-471XJB (470nH)
️· Resistor: CRC06030000Z0EA (0 Ohms)

5. Important Considerations & Notes

️· Layout Sensitivity: The performance of the transmitter (especially range and reliability) is highly dependent on the PCB layout and antenna design.
️· Crystal Selection: The crystal frequency determines the operating frequency of the transmitter.
️· Regulatory Compliance: Operation in the 300-450 MHz range is subject to regulatory requirements (FCC in the US, ETSI in Europe, etc.). Ensure that your application complies with applicable regulations.
️· Disclaimer: Micrel disclaims any liability or warranties relating to the use of their products. It's the user's responsibility to ensure that the product is suitable for its intended application and complies with all applicable standards.
️· Life Support Applications: Micrel products are *not* designed for use in life-support systems.