Part Number: TRS3122E
We encounter communication problem when we connected two TRS3122E together. One TRS3122E is on the uC board and another TRS3122 is 28" away on the communication hub. They are connected via a RJ45 cable.
The communication hub side is close to metal chassis and the common mode noise is injected into ground of the uC and the metal chassis up to 1000V p-p sine waveform.
I am try to find way to increase the noise immunity and please comment on the following questions:
1. We supply Vcc with 3.3V now. Is it better to use 5V supply?
2. For capacitor selection with Vcc = 3.3V, we currently use 100nF for all C1 - C5, is it better to use C1 = 47nF, C2 = 470nF, C3 = 100nF, C4=C5=470nF,
3. Is it better to use 4.7uF Cbypas for Vcc and Vl than 0.1uF for noise immunity?
4. For all test in done at Rload = 3kOhm, and the datasheet shows receiver input resistance in 5kOhm, is that means we can add another Rload in parallel with 5kOhm to 3kOhm to increase the current? Or
If you can think of any ways to improve the noise immunity of configuring the TRS3122E, we appreciate your comments.
Thank you very much,
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
In reply to frank wong:
In reply to Hao L:
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.