The AD5700/AD5700-1 are single-chip solutions, designedand specified to operate as a HART® FSK half-duplex modem,complying with the HART physical layer requirements. TheAD5700/AD5700-1 integrate all of the necessary filtering, signaldetection, modulating, demodulating and signal generationfunctions, thus requiring few external components. The 0.5%precision internal oscillator on the AD5700-1 greatly reducesthe board space requirements, making it ideal for line-poweredapplications in both master and slave configurations. The maximumsupply current consumption is 115µA, making theAD5700/AD5700-1 an optimal choice for low power loop-powered applications.Transmit waveforms are phase continuous 1200 Hz and2200 Hz sinusoids. The AD5700/AD5700-1 contain accuratecarrier detect circuitry and use a standard UART interface.
Feature
- 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
- Buffered HART output—extra drive capability
- 8 kV HBM ESD rating
- 1.71 V to 5.5 V power supply
- 1.71 V to 5.5 V interface
- −40°C to +125°C operation
- 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
(Picture: Pinout)
