CS42L51(2005) View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS42L51
(Rev.:2005)

Low Power, Stereo CODEC with Headphone Amp

Cirrus Logic 

CS42L51

7.2 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. Figure 32 shows the THD+N versus frequency for the ADC analog input. Plots were tak-

en from the CDB42L51 using an Audio Precision analyzer.

-60

-64

-68

-72

-76

d

B

F

-80

S

-84

-88

-92

-96

-100

20

1 µF

10 µF

22 µF

Legend –

Capacitor Value on ADC_FILT+

50

100

200

500

1k

2k

Hz

5k

10k

20k

Figure 32. ADC THD+N vs. Frequency w/Capacitor Effects

74

DS679A2

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