CS4392(2002) 查看數據表（PDF） - Cirrus Logic

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CS4392
(Rev.:2002)

24-Bit, 192 kHz Stereo DAC with Volume Control

Cirrus Logic 

CS4392

3.7 De-Emphasis

The device includes on-chip digital de-emphasis. Figure 7 shows the de-emphasis curve for FS equal to

44.1 kHz. The frequency response of the de-emphasis curve will scale proportionally with changes in sam-

ple rate, Fs. Please see Table 5 for the desired de-emphasis control for Stand-alone mode and Table 10 for

control port mode.

The de-emphasis feature is included to accommodate audio recordings that utilize 50/15 µS pre-emphasis

equalization as a means of noise reduction.

De-emphasis is only available in Single Speed Mode.

Gain

dB

T1=50 µs

0dB

-10dB

T2 = 15 µs

F1

3.183 kHz

F2 Frequency

10.61 kHz

Figure 7. De-Emphasis Curve

M2

(DEM)

0

1

DESCRIPTION

No De-Emphasis

De-Emphasis Enabled

FIGURE

7

Table 5. De-Emphasis Select, Stand-Alone Mode

3.8 Oversampling Modes

The CS4392 operates in one of three oversampling modes based on the input sample rate. Mode selection

is determined by the M3 and M2 pins in Stand-Alone mode or the FM bits in Control Port mode. Single-

Speed mode supports input sample rates up to 50 kHz and uses a 128x oversampling ratio. Double-Speed

mode supports input sample rates up to 100 kHz and uses an oversampling ratio of 64x. Quad-Speed mode

supports input sample rates up to 200 kHz and uses an oversampling ratio of 32x

M3

M2

DESCRIPTION

0

0

Single-Speed without De-Emphasis (4 to 50 kHz sample rates)

0

1

Single-Speed with 44.1kHz De-Emphasis

1

0

Double-Speed (50 to 100 kHz sample rates)

1

1

Quad-Speed (100 to 200 kHz sample rates)

Table 6. Mode Selection, Stand-Alone Mode Options

12

DS459PP2

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