Micrel recently rolled out the MICRF219, ultra low-power, 300 MHz to 450 MHz, superheterodyne, image-reject, RF receiver with OOK/ASK demodulator. The device consumes just 12 mW of power (4 mA from 3 V at 315 MHz) during continuous receive operation, making it suitable for remote keyless entry applications. A low-power shutdown mode reduces power consumption to 1,5 μW.
The device offers -110 dBm receive sensitivity at a data rate of 1 Kbps (Manchester encoded) and requires only a crystal and a minimum number of external components to implement. It also employs an optional squelch feature which disables the data output, allowing the microcontroller to remain in low-power shutdown mode until valid bits are detected.
A Desense feature allows sensitivity to be reduced 6 to 42 dB, which is helpful while training the receiver to recognise only desired transmitters, and isolating the receiver from distant, undesired transmitters. The auto-polling feature also allows power consumption to be reduced to under 0,5 mW while allowing the receiver to awake and poll for valid bits before awaking the microcontroller, thus saving power.
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