Part Number: RC4580
I wonder RC4580 has the concern of phase reversal when input voltage
was invalid such as that happening on LM2902?
Sorry to disturb your job about this kind of matter. Please give your advice.
For the RC4580, there shouldn't be issues on the phase reversal when you have an invalid input voltage. However, it is important to mention that you need to verify the output vs input linearity. In the typical application section, the device is configured in differential mode. This configuration results in a unity gain from 2V to 10V. Any value outside this range may result in a saturation voltage. So, it is always important to verify the valid range for your application.
Please let me know if you have additional questions or comments on this.
Best regards,Luis Fernando Rodríguez S.
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 Luis Fernando Rodriguez S.:
Thank you so much for your valuable information about "Differential mode".
I would like to confirm more detail about that. Please give your advice.
1)What is the meaning of "Unity gain"? Does it mean 0dB(gain x1) operation?
2)Regarding "Differential mode", How to enter into such mode if the customer
was using under Noninverting schematic? Negative voltage was applied to IN+
3)Also regarding "Differential mode", How to escape from "Differential mode"?
IN+ voltage was returned to normal voltage? VCC+ off, then on?
In reply to hideyuki sakai:
Please take a look at my responses below:
Yes, it means 0dB or 1x gain.
2)Regarding "Differential mode", How to enter into such mode if the customer was using under Noninverting schematic? Negative voltage was applied to IN+ pin?
The differential mode requires of the two internal operational amplifiers. The RC4580 is a dual operational amplifier. These two amplifiers must be routed accordingly with the figure 13: https://www.ti.com/lit/ds/symlink/rc4580.pdf#page=9
If customer is using a noninverting schematic, he will be using the circuit configuration that you attached in your previous post. Just remember that the gain will be given by 1 + RF/RIN.
3)Also regarding "Differential mode", How to escape from "Differential mode"? IN+ voltage was returned to normal voltage? VCC+ off, then on?
The differential mode is a particular use case of the RC4580. If customer doesn't require to use differential output, he may use the non inverting circuit like the one you mentioned. In the differential mode circuit from figure 13, the RC4580 may be used to convert a single-ende input into a differential output with unity gain (0dB). A single supply is used in this configuration (Vcc+ = +15V).
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.