The AD5700 is a single-chip solution, designed and specified to operate as a HART® FSK half-duplex modem, comply¬ing with the HART physical layer requirements. The AD5700 integrates all of the necessary filtering, signal detection, modulating, demodulating and signal generation functions, thus requiring few external components. The maxi¬mum supply current consumption of 115 µA and the small 4mm x 4mm housing, makes the AD5700 an optimal choice for low power loop-powered applica-tions. Transmit waveforms are phase continuous 1200 Hz and 2200 Hz sinusoids. The AD5700 contains accurate carrier detect circuitry and uses a standard UART interface.