Owner's manual

CS4272

DS593F1 39

8.2 DAC Control - Address 02h

8.2.1 Auto-Mute (Bit 7)

Function:

When set, enables the Auto-Mute function. See “Auto-Mute” on page 30.

8.2.2 Interpolation Filter Select (Bit 6)

Function:

This Function allows the user to select whether the Interpolation Filter has a fast or slow roll off. When

set, this bit selects the slow roll off filter, when cleared it selects the fast roll off filter. The - 3 dB corner

is approximately the same for both filters, but the slope of the roll off is greater for the fast roll off filter.

8.2.3 De-Emphasis Control (Bits 5:4)

Function:

Implementation of the standard 50/15 µs digital de-emphasis filter response, Figure 19, requires re-

configuration of the digital filter to maintain the proper filter response for 32, 44.1 or 48 kHz sample

rates. NOTE: De-emphasis is available only in Single-Speed Mode. See Table 13 below.

76543210

AMUTE FILT_SEL DEM1 DEM0 RMP_UP RMP_DN INV_A INV_B

Table 13. De-Emphasis Mode Selection

DEM1 DEM0 Description

0 0 Disabled (default)

0 1 44.1 kHz de-emphasis

1 0 48 kHz de-emphasis

1 1 32 kHz de-emphasis

Gain

-10dB

0dB

Frequency

T2 = 15 µs

T1=50 µs

F1 F2

3.183 kHz 10.61 kHz

Figure 19. De-Emphasis Curve