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MAQRF112YMM Datasheet(PDF) 10 Page - Micrel Semiconductor |
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MAQRF112YMM Datasheet(HTML) 10 Page - Micrel Semiconductor |
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10 / 15 page  Micrel, Inc. MAQRF112 February 7, 2013 10 Revision 1.0 Power Amplifier The power amplifier serves two purposes: to buffer the VCO from external elements and to amplify the phase- locked signal. The power amplifier can produce +10dBm at 3V (typical). The PA output matching network to a 50 Ω load or to a PCB antenna serves two purposes: to optimize PA output power and to minimize unwanted harmonics. Matching values are a function of operational frequency and load impedance seen by the MAQRF112. The “Application Information” section provides matching values for 315MHz and 433.92MHz. Power Control Using an External Resistor A resistor (R7 on the 50 Ω evaluation board) is in series with the output RF choke and can be used to adjust the RF output power and supply current. This adjustment can also be used to lower the power to meet FCC compliance. See the “Output Power and Supply Current vs. RBIAS” graphs in the “Typical Characteristics” section for examples of performance on the 50 Ω evaluation boards. An evaluation board using a PCB antenna can have its radiated power lowered by adjusting this series resistor. The resistor value must be calibrated empirically, and will vary depending on the final product PCB layout and form factor. Enable Control The Enable control gates the ASK data to the PA. It allows transmission only when the lock, crystal amplitude, and undervoltage detect conditions are valid. An Enable and ASK logic-level HIGH places the PA in the Mark condition. An Enable logic-level LOW disables the power amplifier. An Enable logic-level HIGH and an ASK logic-level LOW places the PA in the Space condition. To transmit with FSK modulation, both the EN and ASK pins must be set to a logic-level HIGH while the FSK pin is digitally modulated with a logic-level signal. ASK Input Control An ASK logic-level data input modulates the RF carrier when the PA is enabled. Apply a data stream less than 50Kbps (Manchester Encoded, 50% duty-cycle) for ASK modulation. Tying the FSK pin low is recommended when ASK modulation is used. Undervoltage Detect The undervoltage detect block senses the operating voltage. If the operating voltage falls below 1.6V, the undervoltage detect block sends a signal to the enable control block to disable the PA. |
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