CS4385(2004) 데이터 시트보기 (PDF) - Cirrus Logic

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CS4385
(Rev.:2004)

114 dB, 192 kHz 8-Channel D/A Converter

Cirrus Logic 

CS4385

3.6 De-Emphasis

The CS4385 includes on-chip digital de-emphasis filters. The de-emphasis feature is included to

accommodate older audio recordings that utilize pre-emphasis equalization as a means of noise

reduction. Figure 20 shows the de-emphasis curve. The frequency response of the de-emphasis

curve will scale proportionally with changes in sample rate, Fs if the input sample rate does not

match the coefficient which has been selected.

In software mode the required de-emphasis filter coefficients for 32 kHz, 44.1 kHz, or 48 kHz are

selected via the de-emphasis control bits.

In hardware mode only the 44.1 kHz coefficient is available (enabled through the M2 pin). If the

input sample rate is not 44.1 kHz and de-emphasis has been selected then the corner frequen-

cies of the de-emphasis filter will be scaled by a factor of the actual Fs over 44,100.

Gain

dB

T1=50 µs

0dB

-10dB

T2 = 15 µs

F1

3.183 kHz

F2 Frequency

10.61 kHz

Figure 20. De-Emphasis Curve

24

DS671A1

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