Data Translation DT300 Series, Руководство пользователя, Страница: 153 / 164

Using Your Own Screw Terminal Panel
153
Analog Outputs
The analog output channels on DT300 Series boards have a resolution of 12 or 16 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 may be experienced 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
μ
F capacitor between the output side of the 100
Ω
resistor and output low.