CS4373 Datasheet, PDF (12/20 Pages) Cirrus Logic – Low-power, High-performance Delta-Sigma Test DAC

CS4373
6.4 Gain Accuracy
Gain accuracy of the CS4373 is affected by
variations of the voltage reference input. A
change in the voltage reference input imped-
ance due to a change in MCLK could affect
gain accuracy when using the higher source
impedance configuration of Figure 5. The
VREF+ pin input impedance and the external
low-pass filter resistor create a voltage divider
for the output reference voltage, reducing the
effective voltage reference input. If gain error
is to be minimized, especially when MCLK is to
be changed, the voltage reference should be
buffered to have a low output impedance to
minimize the effect of the resistive
voltage divider.
6.5 Gain Drift
Gain drift of the CS4373 due to temperature
does not include the temperature drift charac-
teristics of the external voltage reference. Gain
drift is not affected by the sample rate or by
power supply variations.
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