CRD42L51 Cirrus Logic Inc, CRD42L51 Datasheet - Page 78

• Manufacturer Part Number: CRD42L51
• Description: Ref Bd Low-voltage Stereo Codec
• Manufacturer: Cirrus Logic Inc

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20
ADC_FILT+ Capacitor Effects on THD+N
The value of the capacitor on the ADC_FILT+ pin, 16, affects the low frequency total harmonic distortion +
noise (THD+N) performance of the ADC. Larger capacitor values yield significant improvement in THD+N
at low frequencies.
en from the CDB42L51 using an Audio Precision analyzer.
50
100
200
Figure 33
Figure 33. ADC THD+N vs. Frequency w/Capacitor Effects
500
shows the THD+N versus frequency for the ADC analog input. Plots were tak-
Hz
1k
2k
5k
10k
20k
Legend –
Capacitor Value on ADC_FILT+
1 µF
10 µF
22 µF
CS42L51
DS679F1