DAC8412 Analog crosstalk

Hi Valentin_87,

The test methodology of Analog crosstalk for DAC8412 is a bit different. Here's the summary of the procedure:

Two adjacent DAC channels, let's say DAC1 as the channel under test and DAC2 as the adjacent channel.

1) load both DAC1 and DAC2 to zero scale. Measure DAC1 and name it as V0.

2) Load full scale on DAC 2. Measure DAC1 and name it as V1.

3) Compute for the crosstalk as 20 log ((V1-V0) /Full scale voltage))

Cheers,

Ivan

I understand. But I have a little question: if I use formula above, so, for example, crosstalk = 20log(8mv/20V) = -68 dB. But in datasheet this value is positive.

Is the value in datasheet taken modulo or formula must be 20 log (Full scale voltage / (V1-V0))?

Hi Valentin_87,

I believe the absolute value in dB has been used here, but you are correct, in order to get a positive value, the full scale must be the numerator. Rest assured, the glitch due to cross talk on the idle channel is way lower than the full scale change.

Cheers,

Ivan