I had a customer wants to know on how much distance for the 4-20mA current loop transmitted for DAC161S997? Thanks.
We don't have a maximum distance for the 4-20mA loop, but the resistance of the wire is important when designing for such a long length. The resistance of the wire must be low enough so that the voltage drop across the wire doesn't exceed the compliance voltage of the loop. The datasheet does have show an typical application in section 9.2. In that section, it also has some calculations on the compliance voltages in section 18.104.22.168 when there are other devices in the loop.
Also in the typical application, a table describes the loop power supply for different loads and system wiring, going out to 2000ft.
There may be other considerations with EMI and EMC. If the system and loop wire is well shielded, then the signal should be good for longer lengths.
I would say that it is certainly good to 100m, but it should go much longer. I know of one tested system that ran out to 1km.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs and
embedded processors, along with software, tools and the industry’s largest sales/support staff.