CS4329 Datasheet, PDF (14/36 Pages) Cirrus Logic – 20-Bit, Stereo D/A Converter for Digital Audio

CS4329
Precision in the 10th anniversary addition of AU-
DIO.TST.
Figure 17 shows a 16 k FFT of a 1 kHz -20 dBFS
input signal. The signal has been filtered by a notch
filter within the System Two to remove the funda-
mental component of the signal.
Figure 18 shows a 16 k FFT of a 1 kHz -60 dBFS
input signal.
Figure 19 shows the fade-to-noise linearity. The in-
put signal is a dithered 20-bit 500 Hz sine wave
which fades from -60 to -120 dBFS. During the
fade, the output from the CS4329 is measured and
compared to the ideal level. Notice the very close
tracking of the output level to the ideal, even at low
level inputs. The gradual shift of the plot away
from zero at signals levels < -110 dB is caused by
the background noise starting to dominate the mea-
surement.
14
DS153F1