MICRF219 300MHz to 450MHz ASK

The MICRF219 is a 300MHz to 450MHz super-heterodyne, image-reject, RF receiver with Automatic Gain Control, OOK/ASK demodulator and analog RSSI output. The device integrates Auto-Poll, Valid Bit-Check, Squelch and Desense features. It only requires a crystal and a minimum number of external components to implement. It is ideal for low-cost, low-power, RKE, TPMS, and remote actuation applications.

The MICRF219 achieves -110dBm sensitivity at a data rate of 1kbps (Manchester encoded). Four demodulator filter bandwidths are selectable in binary steps from 1625Hz to 13kHz at 433MHz, allowing the device to support data rates to 10kbps. The device operates from a supply voltage of 3.0V to 3.6V, and consumes 4.0mA of supply current at 315MHz and 6.0mA at 433.92MHz. A shutdown mode reduces supply current to 0.5uA. The Auto-Polling feature allows the MICRF219 to sleep and poll for user defined periods, thus further reducing supply current. The Valid Bit-Check feature, when enabled in Auto-Poll mode, fully awakes the receiver and sends bits to the microcontroller once a valid number of bits are detected. During normal operation an optional Squelch feature disables the data output until valid bits are detected. An optional Desense feature reduces gain by 6dB to 42dB, distancing the receiver from distantly placed, undesired transmitters.