SM5842AP datasheet(13/23 Pages) NPC

13 / 23 page

SM5842AP/APT

NIPPON PRECISION CIRCUITS—13

Soft Muting

Muting of the left and right channel is controlled

independently by MUTEL and MUTER, respec-

tively. Muting is ON when MUTEL/MUTER is

HIGH, muting is OFF when MUTEL/MUTER is

LOW.

When MUTEL/MUTER goes HIGH, the attenuation

changes smoothly from 0 to

−∞ dB in 512/fs, or

approximately 11.6 ms when fs = 44.1 kHz. When

MUTEL/MUTER goes LOW, muting is released and

the attenuation changes smoothly from

−∞ to 0 dB,

again taking approximately 11.6 ms.

When RSTN goes LOW, the DOL and DOR outputs

go LOW, immediately muting the output signal.

Muting is released and timing is synchronized when

RSTN goes HIGH.

System Clock (XTI, XTO, CKO, CKSLN)

Two system clock frequencies, 384fs and 256fs, can

be used. An external clock source can be input on

XTI, or a crystal oscillator can be constructed by

connecting a crystal between XTI and XTO. The

system clock is also buffered and then output on

CKO. The system clock frequency selection and the

internal clock frequency are shown in table 2.

Table 2. System clock frequency select

Parameter

CKSLN

HIGH

LOW

XTI input clock frequency (fXI = 1/tXI)

384fs

256fs

CKO clock frequency

384fs

256fs

Internal clock frequency (tSYS)2 × tXI

tXI

Figure 2. Clock generator circuit

CKSLN

XTI

XTO

CKO

1 / 2

Internal system clock

(192fs or 256fs)

To timing controller

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