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Description

The AD5700 / AD5700-1are single-chip solutions, designed and specified to operate as a HART® FSK half-duplex modem, complying with the HART physical layer requirements. The AD5700/AD5700-1integrate all of the necessary filtering, signal detection, modulating, demodulating and signal generation functions, thus requiring few external components. The 0.5%
precision internal oscillator on the AD5700-1 greatly reduces the board space requirements, making it ideal for line-powered applications in both master and slave configurations. The maxi
mum supply current consumption is 115 μA, making the AD5700/AD5700-1 an optimal choice for low power loop-powered applications. Transmit waveforms are phase continuous 1200 Hz and
2200 Hz sinusoids. 

Features

1. HART-compliant fully integrated FSK modem
2. 1200 Hz and 2200 Hz sinusoidal shift frequencies
3. 115 μA maximum supply current in receive mode
4. Suitable for intrinsically safe applications
5. Integrated receive band-pass filter
6. Minimal external components required
7. Clocking optimized for various system configurations
8. Ultralow power crystal oscillator (60 μA maximum)
9. External CMOS clock source
10. Precision internal oscillator (AD5700-1only)
11. Buffered HART output—extra drive capability
12. 28 kV HBM ESD rating
13. HART physical layer compliant
14. UART interface

Applications 

1. Field transmitters
2. HART multiplexers
3. PLC and DCS analog I/O modules
4. HART network connectivity