Part Number: TLV320ADC3140
My customer is evaluating TLV320ADC3140 and abnormal data is outputted when swift excessive voltage is inputted.
Output data is normal when voltage is not swift as following attached.
This symptom appears in spite of input channel port and zero data is outputted when swift excessive voltage is inputted into multiple channels simultaneously.
They are using only PGA function on related level adjusting(not using digital volume, auto gain).
I have two questions.
・Is this behavior caused by any function of this ADC?
・Is there any hided register to find this condition?
Can you also show what the input voltage signal looks like, or provide the voltage levels and ramp/slew rates so we can better conceptualize what is being applied to the ADC input?
Regards,Collin WellsPrecision ADC Applications
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In reply to Collin Wells:
Thank you for your reply.
I attach the waveform.
The phenomenon is not occurred when sine wave.
Is this any protection function?
In reply to Kuramochi Tadahiko:
I'm sorry to trouble you.
How is this progress?
The data sheet specifies a maximum input voltage, as follows:
The plot shows a 3.3V signal swing, so the signal will be clipped at the ADC input. Please reduce the signal swing to within data sheet specs.
Best regards, Pedro
In reply to PedroGelabert:
Thank you for your information.
I understand you answer.
This behavior is not intended, right?
To Pedro-san's point, the maximum input voltage of the ADC is being exceeded by this input voltage. Therefore the results will likely be unexpected.
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