AD5700-1ACPZ-RL7

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.

Key Features

• 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
• 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

Application

• Field transmitters
• HART multiplexers
• PLC and DCS analog I/O modules
• HART network connectivity