Hello,
i have interfaced ADS1256 waveshare board with Arduino Uno. Xtal clk pin on ADS1256 the input of xtal (7.68 MHz) is connected to that. If I check the clk frequency using oscilloscope probe there is no frequency waveform on oscilloscope, Does that mean crystal has gone bad?
Regards
ANurag
Not necessarily as it certainly will not appear as a 7.68 MHz, 3 volt squarewave.
What load capacitor values did you use?
I would like to thank you for your reply.
If I see in board Xtal is connected with 18pf capacitors, And I guess every xtal is connected through same value capacitor.
I couldn't see a sinewave over 4.9 MHz crystal on my ads1232 board as well, when I put an oscilloscope probe on the input. Same time I see a small one , 100-200 mV signal if a probe on the output side. Data sheet for ads123x family adc tells that oscillator circuitry is very low power, though I 'd think that probe introduces a small capacitance, 20-30 pF, and it's enough to freeze an oscillator. Could be same things for ads1256