DESCRIPTION

· The AD5700/AD5700-1 are single-chip HART FSK half-duplex modems compliant with HART physical layer requirements.

· They integrate filtering, signal detection, modulation, demodulation, and signal generation, requiring minimal external components.

· The AD5700-1 features a 0.5% precision internal oscillator, reducing board space and ideal for line-powered applications.

· With a maximum supply current of 115 µA, they are suitable for low power loop-powered applications.

· Transmit waveforms are phase continuous 1200 Hz and 2200 Hz sinusoids.

· They include accurate carrier detect circuitry and a standard UART interface.

FEATURES

· Fully integrated HART-compliant FSK modem.

· 1200 Hz and 2200 Hz sinusoidal shift frequencies.

· Maximum supply current of 115 µA 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 (AD5700-1 only).

· Buffered HART output with extra drive capability.

· 8 kV HBM ESD rating.

· Power supply range from 1.71 V to 5.5 V.

· Interface voltage range from 1.71 V to 5.5 V.

· Operating temperature range from -40°C to +125°C.

· 4 mm × 4 mm LFCSP package.

· HART physical layer compliant UART interface.

APPLICATIONS

· Field transmitters.

· HART multiplexers.

· PLC and DCS analog I/O modules.

· HART network connectivity.