| Electronics > Projects, Designs, and Technical Stuff |
| 14.4V ground reference for ADC |
| << < (26/33) > >> |
| Simon:
--- Quote from: Arjunan M R on May 31, 2019, 02:11:44 am --- --- Quote from: Simon on May 30, 2019, 04:59:45 pm --- --- Quote from: Arjunan M R on May 30, 2019, 04:50:35 pm ---I am using a 100nF ceramic and 10uF tantalum for bypassing ADC , DAC and VRef. Is that enough? --- End quote --- Do you mean you have one 100nF ceramic and one 10uF tantalum for all 3 or that they have a pair each? --- End quote --- A pair of 100n and 10uF for 3 of those. --- End quote --- No, you want at least one 100nF per chip as close to the pins as possible, if the chips are all close you may get away with a single 10µF capacitor. |
| Arjunan M R:
--- Quote from: Simon on May 31, 2019, 06:57:56 am --- --- Quote from: Arjunan M R on May 31, 2019, 06:55:37 am --- --- Quote from: Simon on May 31, 2019, 06:54:31 am --- --- Quote from: Arjunan M R on May 31, 2019, 06:44:26 am ---Is adding a TVS diode to the input and output a good idea? --- End quote --- Input of what? --- End quote --- input of psu --- End quote --- If you are powering it off a mains transformer it should not be neccessary. No harm in using one if you want to. Be sure to understand all the specs of the TVS, they don't trigger on/off at a single threshold. --- End quote --- I am using a AC to DC adapter 19 V 2 A |
| Arjunan M R:
--- Quote from: Simon on May 31, 2019, 06:59:23 am --- --- Quote from: Arjunan M R on May 31, 2019, 02:11:44 am --- --- Quote from: Simon on May 30, 2019, 04:59:45 pm --- --- Quote from: Arjunan M R on May 30, 2019, 04:50:35 pm ---I am using a 100nF ceramic and 10uF tantalum for bypassing ADC , DAC and VRef. Is that enough? --- End quote --- Do you mean you have one 100nF ceramic and one 10uF tantalum for all 3 or that they have a pair each? --- End quote --- A pair of 100n and 10uF for 3 of those. --- End quote --- No, you want at least one 100nF per chip as close to the pins as possible, if the chips are all close you may get away with a single 10µF capacitor. --- End quote --- Yes, I am using 100nF for every chips. |
| Arjunan M R:
Here is the TVS diode I am going to use. I have read the full datasheet. It has a breakdown voltage of 22.2 to 24.5V. Max. reverse leakage current of 1µA. Max. clamping voltage of 32.4V. And maximum peak pulse surge current of 12.3A. That will be good enough for my purpose. :-+ |
| Simon:
--- Quote from: Arjunan M R on May 31, 2019, 07:41:56 am ---Here is the TVS diode I am going to use. I have read the full datasheet. It has a breakdown voltage of 22.2 to 24.5V. Max. reverse leakage current of 1µA. Max. clamping voltage of 32.4V. And maximum peak pulse surge current of 12.3A. That will be good enough for my purpose. :-+ --- End quote --- No it won't, check the reverse standoff voltage. it will turn on at 22.2-24.5V but will not turn off again until 2-3 volts lower, if this is near the peak voltage of the supply you can get it triggered permanently. |
| Navigation |
| Message Index |
| Next page |
| Previous page |