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The AD5700/AD5700-1 are single-chip soluTIons, designed and specified to operate as a HART® FSKhalf-duplex modem, complying with the HART physical layer requirements. The AD5700/AD5700-1 integrateall of the necessary filtering, signal detecTIon, modulaTIng, demodulaTIng and signal generation functions, thus requiring fewexternal components. The 0.5% precision internal oscillator on the AD5700-1 greatly reduces the board space requirements, making it ideal for line-powered applications in both master and slave configurations. The maximum supply current consumption is 115µA, making theAD5700/ AD5700-1 an optimal choiceforlowpowerloop-powered applications. Transmit waveforms are phase continuous 1200 Hz and 2200 Hz sinusoids. The AD5700/AD5700-1 containaccurate carrier detect circuitry and use a standard UART interface