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.
we are testing with the ADS7883 ADC evaluation board, sampling a digital pulse. We are trying to measure the pulse amplitude of a 250 ns wide pulse. The signals into the AD7883 eval board are single-ended +5V levels. The max clock rate is around 5 Mhz. If the CS goes low 150 ns into the pulse will the converter accurately capture the pulse amplitude? Is the track and hold function dependent upon the input SCLK speed, or is it based upon when the CS goes low?
The track and hold function depends on /CS as well as the frequency of SCLK. The falling edge of /CS actually marks the end of the ADC's sampling phase. After this point the ADC goes into hold mode and starts converting the sampled analog input. The ADC uses SCLK to convert, so the frequency of SCLK determines the conversion time, which ends on the 13th rising edge of SCLK (after the /CS H->L transition). After this point the ADC enters the sampling phase until /CS goes low once again. So to answer your question the falling edge of /CS determines when conversion begins (or sampling ends) and the frequency of SCLK determines conversion time as well as when the next sampling phase can begin. In your case, as long as the ADC input has settled, the ADC should provide an accurate conversion result.
Product Applications, TI Current & Magnetic Sensing Products
Getting Started with Current Sensing Video Training Series
Hall Effect Training Resources
TI makes no warranties and assumes no liability for applications assistance or customer product design. You are fully responsible for all design decisions and engineering with regard to your 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 your designs.
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.
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.