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CS4329 датащи(PDF) 14 Page - Cirrus Logic |
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CS4329 датащи(HTML) 14 Page - Cirrus Logic |
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14 / 36 page ![]() CS4329 14 DS153F1 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. |
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