HART Modem

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

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The DS8500 is a single-chip modem with Highway Addressable Remote Transducer (HART) capabilities and satisfies the HART physical layer requirements. 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.

Data Sheet

Download	Rev 1	(PDF, 128kB)
E-Mail

An evaluation kit is available: DS8500-KIT

Key Features

Single-Chip, Half-Duplex, 1200bps FSK Modulation and Demodulation
Digital Signal Processing Provides Reliable Input Signal Detection in Noisy Conditions
Sinusoidal Output Signal with Lowest Harmonic Distortion
Few External Components Enable a Space-Saving Solution
Standard Component 3.6864MHz Crystal
Complies to HART Physical Layer Requirements
2.7V to 3.6V Operating Voltage
285µA (max) Current Consumption
Space-Saving, 5mm x 5mm x 0.8mm, 20-Pin TQFN Package

Applications/Uses

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

Diagram

Typical Application Circuit

Application Notes

Tutorial 4676		Introduction to the DS8500 HART Modem
Tutorial 4701		Introduction to Programmable Logic Controllers (PLCs) and the Operational Function of Main System Modules

Product Guides

Communications (PDF)

Interface (PDF)

Microcontrollers (PDF)

Reliability Reports

Reliability Report:

DS8500.pdf

Software/Models

none

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS8500-JND+			Active	TQFN;20 pin;26 mm² Outline Drawing:21-0140 (PDF) Land Pattern: 90-0008 (PDF) Use pkgcode/variation: T2055+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS8500-JND+T&R			Active	TQFN;20 pin;26 mm² Outline Drawing:21-0140 (PDF) Land Pattern: 90-0008 (PDF) Use pkgcode/variation: T2055+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
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Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.