CS4331 datasheet(14/38 Pages) CIRRUS

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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-

c usse d by Au d io Pre cisio n in the 10t h

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

Figure 13. Frequency Response

Figure 14. THD+N vs. Amplitude

Figure 15. 0 dBFs FFT

CS4330, CS4331, CS4333

DS136F1

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