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.
Dear support Team
We suggest LM2903-Q1 for clock generator.(Prease reffer to attached schematic)
I simulated it and understood that slew rate was an important spec for accuracy.
Could you provide slew rate variation of LM2903-Q1? (rough data is good for us)
Please let me know if there is other recommended IC.
◆Clock generator Spec
Tomohiro-san, I do not think slew rate is the critical factor. I don't have any data on slew rate. Keeping capacitance on Vo node low will help slew rate , rise and fall times. Propagation delay will be a more important factor. The characterization data shows a +/-10% variance in 5mV overdrive propagation delay, device to device. Across temperature is a different story. At 125C the delay increases by 63%. At -40C the delay decreases -26% The overdrive in this application is time dependent. Increased overdrive lessens prop delay, however the overdrive also increases the peak to peak voltage on the capacitor which reduces frequency compared to the theoretical calculation.
Regards,Ronald MichallickLinear Applications
TI assumes no liability for applications assistance or customer product design. Customer is fully responsible for all design decisions and engineering with regard to its products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning Customer's design. If Customer desires engineering services, the Customer should rely on its retained employees and consultants and/or procure engineering services from a licensed professional engineer (LPE).
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 Ron Michallick:
Thank you for quick response.
I understand propagation delay is important factor of IC.
Calcurating the variance of temperature factor only,the variance of propagation delay is ＋63%/-26% at 5mV overdrive(1.3us typ).
The variance of propagation delay @ 5mV is +0.819us(=1.3us×63%)/-0.338us(=1.3us×26%)
If set frequency to 51.2kHz(≒19.53us), laugh estimate of frequency is <+8.3%(≒0.819us×2/19.53us)/-3.46%(≒-0.338us×2/19.53us)
Is it correct?
In reply to Tomohiro Nagasawa:
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.