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        The SD2017 is a CMOS single chip modem IC used in Highway Addressable Remote Transducer (HART) field instruments and masters. This IC together with a few external passive components provide all functions needed to satisfy HART physical layer requirements including modulation, demodulation, receive filtering, carrier detect, and transmit signal wave shaping.
        The SD2017 uses phase continuous Frequency Shift Keying (FSK) at 1200 bps, and operates in half duplex mode per HART protocol. The maximum supply current consumption in transmit mode is 90μA while using 3.6864MHz external Clock source input and 5.5V power supply.
        The SD2017 is pin compatible with SD2015, HT2015 and A5191HRT. There is no need to change PCB when replacing any of the above ICs with SD2017. Some components on the original PCB are no longer needed, while others are changed to different types or different values. Refer to “Replacing SD2015 with SD2017” section for details.