Low power HART FSK modem provides a single-chip half-duplex physical-layer interface for field transmitters, HART multiplexers, and industrial analog I/O modules. The device integrates filtering, signal detection, modulation, demodulation, signal generation, an internal reference, and a buffered HART output. The AD5700-1 version includes a 0.5 percent precision internal oscillator and supports 1200 Hz and 2200 Hz continuous-phase sinusoidal shift frequencies. Operation is specified from 1.71 V to 5.5 V over a −40 °C to +125 °C temperature range in a 24-lead 4 mm × 4 mm LFCSP package.
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| Function | HART FSK half-duplex modem |
| HART compliance | HART physical layer compliant |
| Interface | UART |
| Mark frequency | 1200Hz |
| Space frequency | 2200Hz |
| Internal oscillator accuracy | ±0.5% |
| Supply voltage range | 1.71 to 5.5V |
| Digital interface supply voltage range | 1.71 to 5.5V |
| Receive-mode supply current | 115 maxµA |
| Transmit-mode supply current | 140 maxµA |
| Internal reference voltage | 1.5 typV |
| External reference input voltage | 2.5 typV |
| ESD rating, human body model | 8kV |
| Operating temperature range | -40 to +125°C |
| Carrier detect on time | 6 maxbit times |
| Carrier detect off time | 6 maxbit times |
| Internal oscillator power-up time | 25 typµs |
| Package | 24-lead LFCSP_WQ, 4 mm x 4 mm |
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