The AD5700/AD5700-1 are single-chip solutions, designed and specified to operate as a HART® FSK half-duplex modem, complying with the HART physical layer requirements. The AD5700/AD5700-1 integrate all of the necessary filtering, signal detection, modulating, demodulating and signal generation functions, thus requiring few external 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 choice for low power loop-powered applications. Transmit waveforms are phase continuous 1200 Hz and 2200 Hz sinusoids. The AD5700/AD5700-1 contain accurate carrier detect circuitry and use a standard UART interface. Applications * Field transmitters * HART multiplexers * PLC and DCS analog I/O modules * HART network connectivity * HART-compliant fully integrated FSK modem * 1200 Hz and 2200 Hz sinusoidal shift frequencies * 115 µA maximum supply current in receive mode * Suitable for intrinsically safe applications * Integrated receive band-pass filter * Minimal external components required * Clocking optimized for various system configurations * Ultralow power crystal oscillator (60 µA maximum) * External CMOS clock source * Precision internal oscillator https://elecena.pl/product/2567193/low-power-hart-modem-with-precision-internal-oscillator 2012-03-01 https://elecena.pl/product/2567193/low-power-hart-modem-with-precision-internal-oscillator 2018-03-28 https://elecena.pl/product/2567193/low-power-hart-modem-with-precision-internal-oscillator 2025-01-22