CDB43L43 Ver la hoja de datos (PDF) - Cirrus Logic

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Fabricante

CDB43L43

Low Voltage, Stereo DAC with Headphone Amp

Cirrus Logic 

CS43L43

3.6.4 Auxilliary Mute Control

For critical applications, the Popguard® Transient Control may not be sufficient in eliminating extra-

neous audible artifacts on the headphone outputs during power-up. For these applications, an option-

al external mute can be used to maintain an absolute minimum of extraneous clicks and pops. Please

see Figures 6 and 7 for the suggested headphone mute circuit.

The Mute Control will need to be generated externally from a DSP or Microcontroller. See Figure 7

for /RST and Mute Control timing.

From CS43L43 Pin 1 0 (HP_A)

2 2 0uF

The M otorola M OSFETs shown have been

tested to work properly, however, an

equivalent device m ay be used.

47u H

M G S F1N H 02E LT

Headphones

1k

16

From CS43L43 Pin 1 4 (HP_B)

2 2 0uF

47u H

M G S F1N H 02E LT

1k

16

Mute Control from uC or DSP

100K

Figure 6. Optional Headphone Mute Circuit

Headphone Output at

pin of part

~ 300 m sec

/R S T

~ 900 m sec

Mute Control from

DSP or

M ic ro C o n tro lle r

Figure 7. Timing for Headphone Mute

DS479PP3

11

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