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HART Modem

Fewer External Components and a Small 20-Pin TQFN Package Reduce System Cost and Size

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

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Key Features

  • Single-Chip, Half-Duplex Modem Overlays 1200bps FSK Digital Communication on Top of Installed 4mA–20mA Current Loop Infrastructure
  • Digital Signal Processing Provides Reliable Input Signal Detection in Noisy Conditions
  • Standard Component 3.6864MHz Crystal Reduces System Cost
  • Fully Tested and Verified as a HART-Registered Modem IC
  • Integrated Solution Requires Minimal Power and Space
    • 2.7V to 3.6V Operating Voltage
    • 285µA (max) Current Consumption
    • Space-Saving, 5mm x 5mm x 0.8mm, 20-Pin TQFN Package
    • Few External Components Required

Applications/Uses

  • 4-20mA Loop-Powered Transmitters for Temperature, Pressure, Flow, and Level Measurement
  • HART Modem Interface Connectivity
  • HART Multiplexers

Description

The DS8500 is a single-chip modem with Highway Addressable Remote Transducer (HART) capabilities. It has been fully tested and verified and has received a HART® Certificate of Registration. The device integrates the modulation and demodulation of the 1200Hz/2200Hz FSK signal, has very low power consumption, and needs only a few external components due to the integrated digital signal processing. The input signal is sampled by an analog-to-digital converter (ADC), followed by a digital filter/demodulator. This architecture ensures reliable signal detection in noisy environments. The output digital-to-analog converter (DAC) generates a sine wave and provides a clean signal with phase- continuous switching between 1200Hz and 2200Hz. Low power is achieved by disabling the receive circuits during transmit and vice versa. The DS8500 is ideal for low-power process control transmitters.

Simplified Block Diagram

DS8500: Typical Application Circuit DS8500: Typical Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .