1 Reply Latest reply on May 18, 2010 10:51 AM by manuel.julian.moron

    STILL NOISE IN THE SECOND COLUMN

    manuel.julian.moron

      Thanks about the Enoa parameter. The datasheets states:       

       

         

      ENOA Noise at 1 kHz (Power = Medium, Opamp Bias = High) – 100 – nV/rt-Hz       

       

         

      But anyway, I introduce  a sinusoid into a PGA follower  (Gain=1) and apart  I monitories the input and output in the First column and I get the image 1, obtaining the expected.       

       

         

      Input=Output (Port 0_3)       

       

         

      (Vsin input= 500Hz 1Vpp and 1Voffset)       

       

         

      When I did the same in the second row I got a noisy sinusoid  output.  The output is equal to the input but the noise is much higher than the specifications told in the datasheet, so I still thinking my part is damaged.       

       

         

      Image 3 shows the add noise is around 800KHz and 1MHz.

         

             

       

      What do you think about it?       

       

         

      Is damaged my part?

         

             

              By the way, I have a RC filter in my Port 0_5  board outout.       

         

      Could it produce the noise?