CS4385(2004) データシートの表示（PDF） - Cirrus Logic

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CS4385
(Rev.:2004)

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

Cirrus Logic 

CS4385

3.11 The MUTEC Outputs

The MUTEC1 and MUTEC234 pins have an auto-polarity detect feature. The MUTEC output pins

are high impedance at the time of reset. The external mute circuitry needs to be self biased into

an active state in order to be muted during reset. Upon release of reset, the CS4385 will detect

the status of the MUTEC pins (high or low) and will then select that state as the polarity to drive

when the mutes become active. The external-bias voltage level that the MUTEC pins see at the

time of release of reset must meet the “MUTEC auto detect input high/low voltage” specs as out-

lined in the Digital Characteristics section.

Figure 25 shows a single example of both an active high and an active low mute drive circuit. In

these designs, the pull-up and pull-down resistors have been especially chosen to meet the input

high/low threshold when used with the MMUN2111 and MMUN2211 internal bias resistances of

10 kΩ.

Use of the Mute Control function is not mandatory but recommended for designs requiring the

absolute minimum in extraneous clicks and pops. Also, use of the Mute Control function can en-

able the system designer to achieve idle channel noise/signal-to-noise ratios which are only lim-

ited by the external mute circuit.

Figure 25. Recommended Mute Circuitry

DS671A1

29

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