AD5700-1

PRODUCTION

Low Power HART Modem with Precision Internal Oscillator

Analog Devices AD5700-1 Product Info

10 February 2026 6

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

Part details & applications

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

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

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