Understanding attenuation AD8475

Discussion in 'General Electronics Chat' started by embedded.world, Apr 21, 2014.

  1. embedded.world

    Thread Starter Member

    Feb 27, 2014
    36
    0
    I am using AD8475 in one of my application:
    http://www.analog.com/static/imported-files/data_sheets/AD8475.pdf


    It says it has attenuation of 0.4 & 0.8.

    Page 21 shows a diagram in which +-10V signal gets attenuated to +4V signal (reference above +2.5V).

    Now my question is when signal is +10V, output is 4.5V. This make a amplitude of 2V, since signal is riding over 2.5V.
    So +10V gets attenuated to 2V, so doesn't that it mean signal gets attenuated by 0.2 but datasheet says it has 0.4
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,013
    3,233
    They are referring to the differential output gain, which is twice the single-ended gain.
     
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