CS4390 데이터 시트보기 (PDF) - Cirrus Logic

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CS4390

24-Bit, Stereo D/A Converter for Digital Audio

Cirrus Logic 

CS4390

Figure 16 shows a 16 k FFT of a 1 kHz full-scale

input signal. The signal has been filtered by a notch

filter within the System Two to remove the funda-

mental component of the signal. This minimizes

the distortion created in the analyzer analog-to-dig-

ital converter. This technique is discussed by Audio

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 24-bit 500 Hz sine wave

which fades from -60 to -120 dBFS. During the

fade, the output from the CS4390 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.

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DS264F1

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