低功耗HART调制解调器 Low Power HART Modem
Product Details
The AD5700/AD5700-1 are single-chip solutions, designed and specified to operate as a HART® FSK half-duplex modem, complying with the HART physical layer requirements. The AD5700/AD5700-1 integrate 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 maximum supply current consumption is 115µA, making theAD5700/AD5700-1 an optimal choice for low power loop-powered applications. Transmit waveforms are phase continuous 1200 Hz and 2200 Hz sinusoids. The AD5700/AD5700-1 contain accurate carrier detect circuitry and use a standard UART interface.
**Applications**
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- Field transmitters
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- HART multiplexers
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- PLC and DCS analog I/O modules
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- HART network connectivity
### Features and Benefits
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- HART-compliant fully integrated FSK modem
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- 1200 Hz and 2200 Hz sinusoidal shift frequencies
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- 115 µA maximum supply current in receive mode
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- Suitable for intrinsically safe applications
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- Integrated receive band-pass filter
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- Minimal external components required
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- Clocking optimized for various system configurations
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- Ultralow power crystal oscillator 60 µA maximum
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- External CMOS clock source
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- Precision internal oscillator
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- Buffered HART output—extra drive capability
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- 8 kV HBM ESD rating
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- 1.71 V to 5.5 V power supply
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- 1.71 V to 5.5 V interface
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- −40°C to +125°C operation
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- 4 mm × 4 mm LFCSP package
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- HART physical layer compliant
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- UART interface
