This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Switch selection for +/- 8V square wave with 20kHz frequency
Hello everyone,I ues 74HCT4051 as Multiplex analog switch,I have followed the circuit structure you recommended, but the output voltage is still not ideal.I hope you can give me some Suggestions to solve this problem,thank you very much.
The circuit structure diagram and DC simulation results are shown below:
Fig 1 1MΩ connect to the Ground.
Input resister value of R5
Fig 2 DC simulation result of fig1
Fig 3 Directly connect to the Ground.
Fig 4 DC simulation result of fig3
In the schematic, can you highlight where you are using the TI switch? Looks like you are using an ideal switch where there is no voltage drop across the switch. If your AM1 voltage is "5 V", you will get the same voltage at VM1 for an ideal switch.
Most likely the drop in the output voltage would be affected by the opamp (OPA656) - I have passed this to the opamp team to get their input.
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 Saminah C:
What is not ideal? You are changing the gain. Even with the LMH6559 grounded, it will produce an offset.
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 andembedded processors, along with software, tools and the industry’s largest sales/support staff.