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ADC Selection, Circuit Note CN-0254 opamp selection

Question asked by sarang.p on Jun 13, 2017
Latest reply on Jun 28, 2017 by Gnib

We are working on the design of data acquisition system.
Specifications are:
1. ADC Resolution: 16bit (minimum 14bit)

2.Number of analog input channel 4 ch. (single ended 4ch., differential 2ch.)
3.. Input Range -10V to +10V, 0 to +5V.
4. Limit frequency (3dB) 10kHz/Through(200kHz) selectable (if possible)
Could you suggest any ADC that supports these specifications?

Alternatively, could you provide solution to this design.

 

Also, I am referring to the circuit note CN-0254. The opamp AD8608 has a slew rate of 5V/us. However, the maximum signal frequency is 1.5MHz and output voltage peak is 4.096V. So as per the calculation slew rate should be: Slew Rate= 2*pi*f*V= 2*3.14*1.5M*4.096= 38.6 V/us. What is the logic working here?

 

Best Regards,

Sarang Suryawanshi

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