The MICRF507 is a fully integrated FSK transceiver with +10dBm power amplifier and transmit/receive switch. The device is targeted at automated meter reading (AMR) applications in the China Short Range Device (SRD) frequency band of 470MHz to 510MHz. The device supports data rates up to 20kbps with PLL divider modulation and up to 200kbps with VCO modulation. The receiver achieves a sensitivity of -113dBm at a data rate of 2.4kbps while only consuming 12mA of supply current. The integrated power amplifier (PA) delivers +10dBm of output power while only consuming 21.5mA of supply current. Power down supply current is a low 0.2A while retaining register information and a low 280A in standby mode where only the crystal oscillator is enabled. The receiver of the MICRF507 utilizes a Zero IF (ZIF) I/Q architecture, integrating a low-noise amplifier (LNA) with bypass mode, I/Q quadrature mixers, three-pole SallenKey IF channel pre-filters, and six-pole elliptic switched capacitor IF filters, providing excellent selectivity, adjacent channel rejection and blocking performance. FSK demodulation is implemented digitally and a synchronizer, when enabled, recovers the received bit clock. A receive signal strength indicator (RSSI) circuit indicates the received signal level over a 50dB range. An integrated Frequency Error Estimator (FEE) and crystal tuning capability allow fine tuning of the RF frequency. The transmitter of the MICRF507 consists of an FSK modulator and power amplifier with output power adjustable from +10dBm to -3.5dBm in seven steps. Modulation can be achieved by applying two sets of PLL divider ratios or through direct VCO modulation by varying VCO tank capacitance.