MAXREFDES18#: Isolated Analog Interface

In PLC and DCS systems, analog output currents and voltages provide critical control and actuation functions. The Carmel (MAXREFDES18#) reference design shown in Figure 1 provides a flexible and programmable analog output that meets industrial control requirements.

The buffered voltage output from the MAX5316 16-bit, high-accuracy digital-to-analog converter (DAC) drives the input of the MAX15500, a programmable analog output conditioner with extensive error reporting. The MAX6126 ultra-high-precision voltage reference provides references for the DAC and the output conditioner. The MAX14850 galvanically isolates data communication between the subsystem and the system controller. Optionally, the subsystem also integrates an isolated and regulated power supply by using the MAX13253 transformer driver and the MAX1659 and MAX1735 low-dropout (LDO) linear regulators.

The subsystem features all typical bipolar current and voltage output ranges, and appropriate subsets, with less than 0.105% total unadjusted error (TUE). The circuit also provides short-circuit and overcurrent protection, open circuit detection, brownout detection, over-temperature protection, all of which are critical for industrial applications. Flexible power-up options make Carmel an ideal choice for robust industrial control systems.

Specifications

Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Wired Communication
Sub-Category	Interface Solutions
Eval Board Part Number	MAXREFDES18#-ND
Eval Board Supplier	Analog Devices Inc./Maxim Integrated
Eval Board	Normally In Stock
Purpose	Isolated Analog Interface
Component Count + Extras	72 + 25
Features	Fault Indication Isolated Power and Data Over Current Protection Short Circuit Protection Thermal Protection Under Voltage Protection, Brown-Out
Data Rate (Max)	– Not Given
Design Author	Maxim Integrated Products
Main I.C. Base Part	MAX13253 MAX14850 MAX15500 MAX1659 MAX1735 MAX5316 MAX6126
Date Created By Author	2013-09
Date Added To Library	2014-02