CS4330 Datasheet, PDF (14/38 Pages) Cirrus Logic – 8 Pin Stereo D/A Converter for Digital Audio

Performance Plots
The following CS4330/31/33 measurement plots
were taken on the CDB4330/31/33 evaluation
board with an Audio Precision Dual Domain
System One. All plots are done in +5V mode at
a 48 kHz sampling rate, and are shown in Fig-
ures 13-20.
Figure 13 shows the CS4330/31/33 frequency re-
sponse. The response is flat to 20 kHz ± 0.1dB
as specified.
Figure 14 shows THD+N versus signal ampli-
tude for a 1 kHz 20-bit dithered input signal.
Figure 15 shows a 16k FFT of a 1 kHz full-scale
input signal. The signal has been filtered by a
notch filter within the System One to remove the
fundamental component of the signal. This mini-
mizes the distortion created in the analyzer
analog-to-digital converter. This technique is dis-
cussed by Audio Precision in the 10th
anniversary edition of AUDIO.TST.
Figure 16 shows a 16k FFT of a 1 kHz -3 dBFs
input signal. The signal has been filtered by a
notch filter within the System One to remove the
fundamental component of the signal.
Figure 17 shows a 16k FFT of a 1 kHz -20 dBFs
input signal. The signal has been filtered by a
notch filter within the System One to remove the
fundamental component of the signal.
Figure 18 shows a 16k FFT of a 1 kHz -60 dBFs
input signal.
Figure 19 shows a 16k FFT of a 1 kHz -90 dBFs
input signal.
Figure 20 shows the fade-to-noise linearity. The
input signal is a dithered 18-bit 500 Hz sine
14
CS4330, CS4331, CS4333
Figure 13. Frequency Response
Figure 14. THD+N vs. Amplitude
Figure 15. 0 dBFs FFT
DS136F1