TI E2E Community
Precision Data Converters
Precision Data Converters Forum
The ADS7861 wery easy to damaged How to protect?
I use ADS7861 to decode SIN/CON encoder (with PMSM motor driver 15KW power).The ADS7861 work on mode #3Before enable PWM Signal (IGBT control signal) The ADS7861 work normallybut after enable PWM Signal The ADS7861 damaged
Hi Chin-Win Lin,
Can you describe for us how you have the ADS7861 connected to your encoder? Would it be possible for you to share a schematic? I suspect when you enabled the 15KW power, there may have been a differential voltage developed across the AGND/DGND boundaries which exceeded the +/-300mv limits or perhaps caused spikes that were above/below the rails. Any detail you can supply which may help us help you locate the potential cause of damage would be greatly appreciated.
Hi Tom : Yes I think you are right. when turn on the PWM(Big power ) I measure The voltage of AVCC/AGND ,The grounding bounce generate, the Voltage up to 1 ~~1.5 Volt
How to eliminate grouning bounce ?
Ground bounce can usually be attributed to layout and component selection. Having local bulk capacitance can help relieve issues between the supplies and ground - the ADS7861 has two supply pins and two ground pins. Pins 1 and 12 should tie directly to the same ground point (preferably a ground plane). Pins 13 and 24 should also be tied to the same +5V rail. If you can send along your schematic and/or layout, we'd be happy to review them for you.
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. 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 respect to these materials. 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 andembedded processors, along with software, tools and the industry’s largest sales/support staff.