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AD8309,pdf datasheet (Logarithmic Amplifier)
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The AD8309 provides limited opportunities for adjustment of
its basic scaling parameters, which are controlled to within tight
limits through robust design. In applications involving the observation
of measured signal levels on a DVM a slope of 10 mV
per decade is convenient: the reading is then directly in decibels,
needing only the positioning of the decimal point. This
may be simply achieved and at the same time trimmed to this
exact value using the scheme shown in Figure 35. A large filter
capacitor CFILT may be added as shown when the voltage is to
be measured on a DVM; this lowers the fluctuation in the lowerorder
display digits.
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