Using Your Own Screw Terminal Panel
143
Analog Outputs
The analog output channels on DT3000 Series boards have a resolution of 12 bits (even though
the accuracy may be less).
Data Translation ensures that the analog outputs do not break into a high frequency oscillation
with high capacitance loads that occur with long cables. Typically, the analog outputs drive
1,000 pF without degradation and bandwidth-limit with higher capacitive loads.
The grounds of most boards are optimized for analog inputs at the expense of some logic or
high-frequency noise on the analog outputs. This is because the analog and digital grounds of
the board are connected at the ADC’s input.
The analog outputs are brought out as a high and a low signal, but the low side is the analog
ground at the DAC’s output buffer. To remove the high-frequency noise and smooth the glitch
energy on the analog outputs, you can install a 15 kHz RC filter on the output, a 100 Ω resistor
in series with the output, and a 0.1 μF capacitor between the output side of the 100 Ω resistor
and output low.
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