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AFE5818: When we developed AFE5818, under the same input signal and the same configuration conditions, we found that the AFE5818 circuit board developed by ourselves was nearly 10 times less than the official development board signal provided by AFE5818. C

yzhao
Prodigy 10 points
Part Number: AFE5818

Tool/software:

When we developed AFE5818, under the same input signal and the same configuration conditions, we found that the AFE5818 circuit board developed by ourselves was nearly 10 times less than the official development board signal provided by AFE5818. Could you please help us see the reason

When the input signal is 5Mhz 50mV and the upper computer software is configured as the maximum gain, the actual signal acquisition situation is as shown in the figure below
1) The data acquisition waveform of AFE5818EVM official development board is limited

2)AFE5818 self-developed circuit board data acquisition waveform

  • 0
    TI__Expert 5955 points

    Hi,

    Expected output would be input * gain . Input is 50mV and gain we can assume in this case to be 40dB . This means gain of 100 . With this it is expected to saturate. Your custom built board might be having some attenuation because of which signal is not saturating.  

    How are you giving signal ? Is extra attenuation because of some loose contact ?