Keithley DAC-02 User Manual page 28

The customary terminology for operation of a DAC-02 differs when you
use an AC reference. If you take the output from the unipolar terminals,
you get 2-quadrant operation because the reference, which may be
positive or negative, is multiplied with a signal that is positive only. If you
take the output from the bipolar terminals, the offset digital input can
effectively be positive or negative, which together with the positive and
negative states of the reference results in 4-quadrant operation.
Two other parameters are of interest in AC operation. The first parameter
is feedthrough, the amount of residual signal at digital zero. Feedthrough,
which is mainly a function of stray capacitance, rises with frequency. At
10 kHz, feedthrough is typically 5 mV peak-to-peak with a ±5 V
reference.
The second parameter, which is a limit at a lower frequency, is the
accuracy/frequency characteristic. Because of distributed capacitance in
the R-2R ladder network, the full 12-bit performance of the DAC falls off
as the frequency rises. Above about 1 kHz, the dynamic performance of
the DAC is less than 12 bits of accuracy.
The DAC-02 performs well in synchro-digital and resolver applications
for sine/cosine generation with a 400 Hz reference.
4-6 Cabling and Wiring
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