TRC101 300-1000 MHz Transceiver - RF Monolithics, Inc.

3. TRC101 Functional CharacteristicsLN A0/ 90I/QDEMODFSKASK+-SDISDOSCKnC SRF _PRF _NTX/RXRSSICONTROLLO G I CnI R QDATA / nF SELCR/F INT/F CAPPAVCOPLLOSCCLKOUTnINT/DDET/NBATT DETRXTAL/REF RSSIAVDD GNDnRESETFigure 2. Functional Block DiagramInput/Output AmplifierThe output power amplifier is an open-collector, differential output with programmable output power whichcan directly drive a loop or dipole antenna, and with proper matching may also drive a monopole antenna.Incorporated in the power amplifier is an automatic antenna tuning circuit to avoid manual tuning duringproduction and to offset “hand effects”. Registers common to the Power Amplifier are:• Power Management Register• Transmit Configuration RegisterThe input LNA has selectable gain (0dB, -6dB, -14dB, -20dB) which may be useful in an environment withstrong interferers. The LNA has a 250ΩOhm differential input impedance which requires a matchingcircuit when connected to 50 Ohm devices. Registers common to the LNA are:• Power Management Register• Receiver Control RegisterBaseband Data and FilteringThe baseband receiver has several programmable options that optimize the data link for a wide range ofapplications. The programmable functions include:• Receive bandwidth• Receive data rate• Baseband Analog Filter• Baseband Digital Filter• Clock Recovery (CR)• Receive FIFO• Data Quality Detector• Valid Data DetectorThe receive bandwidth is programmable from 67kHz to 400kHz to accommodate various FSK modulationdeviations. If the deviation is known for a given transmitter, the best results are obtained with abandwidth at least twice the transmitter FSK deviation.www.RFM.com Email: info@rfm.com Page 7 of 42©by RF Monolithics, Inc. TRC101 - 4/8/08