HART Modem

The DS8500 is a single-chip modem with Highway Addressable Remote Transducer (HART) capabilities and satisfies the HART physical layer requirements. The device integrates the modulation and demodulation of the 1200Hz/2200Hz FSK signal, has very low power consumption, and needs only a few external compo- nents due to the integrated digital signal processing. The input signal is sampled by an Analog-to-digital con- verter (ADC), followed by a digital Filter Demodulator This architecture ensures reliable signal detection in noisy environments. The output digital-to-analog con- verter (DAC) generates a sine wave and provides a clean signal with phase-continuous switching between 1200Hz and 2200Hz. Low power is achieved by dis- abling the receive circuits during transmit and vice versa. The DS8500 is ideal for low-power process con- trol transmitters. By Maxim Integrated Products