Part Number: ISO35
I am trying to understand the effect, if any, of a common mode RF sinusoid applied to the receiver inputs. It seems that the relevant parameter to look at is the -9V to 14V max pin voltage listed in table 7.1. Is that a static parameter (i.e. damage will occur if >14V is applied to the pin indefinitely), or is there a time element associated with it? Also, what is the expected failure mode for a voltage on the input pins that exceed the datasheet range (-9V to 14V) for the A/B inputs? For reference, here is the circuit:
In particular, I'm am curious about the negative limit. If -10V, for example, is put on the Input, I'd expect to see the diode near the base of the BJT to forward bias, but the resistance in that path is quite high, so I wouldn't expect much current to flow (~52uA), and therefore I do not expect the power dissipated in the diode to exceed a few hundred microwatts. So, I doubt that is the failure mode. I think -10V shouldn't be enough to cause the 16V protection circuit to turn-on either...although, I guess the voltage between VCC2 and Input is close to about 16V if VCC2 is at 6V.
Any details you could share would be greatly appreciated. Thanks!
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.