CS4361-CZZR【PDF 9/24 页】IC DAC STER 6CH 105DB 20-TSSOP

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Sheet目录1991

5页 6页 7页 8页 [9页]10页 11页 12页 13页

CS4361

Confidential Draft

9/30/11

4.9

Mute Control

The MUTEC pin is intended to be used as control for an external mute circuit in order to add off-chip mute

capability.

This pin becomes active under the following conditions:

During power-up initialization

Upon reset

If the MCLK to LRCK ratio is incorrect

Upon receipt of 512 consecutive samples of zero

During power-down

The MUTEC pin will only go active on static zero data only if all 6 channels satisfy the 512 sample require-

ment. If any channel receives non-zero data, the mute pin will return low (inactive).

Use of the mute control function is not mandatory but is recommended for designs requiring the absolute

minimum in extraneous clicks and pops. Also, use of the mute control function can enable the system de-

signer to achieve idle channel noise and signal-to-noise ratios that are only limited by the external mute cir-

cuit. The MUTEC pin is an active-high CMOS driver. See Figure 13 below for a suggested active-high mute

circuit.

470

Audio

Out

2 k

10 k

-V

MMUN2111LT1

AOUT

MUTEC

CS4361

Couple

47 k

10 k

Filter

Cap

MMUN2211LT1

(if available)

(Low R

on)

Figure 13. Suggested Active-Low Mute Circuit

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