AK4560A Datasheet, PDF (35/47 Pages) Asahi Kasei Microsystems – 16bit CODEC with ALC and MIC/HP/SPK-Amps

ASAHI KASEI
[AK4560A]
When HP bit is “0”, output signal is muted and enter the Power-Save-Mode. Then HPL and HPR pins output HVCM
voltage. (Refer to Figure 24)
When HPP bit is “0”, Headphone-Amp is powered down perfectly. Then HPL and HPR pins go “L” (AGND). (Refer to
Figure 25)
When PD pin changes from “L” to “H” after power-up, HPL and HPR pins become Power-Save-Mode. In Power-
Save-Mode, output voltage of HPL and HPR pins gradually change from AGND to HVCM voltage by the time constants
of an internal resistor (R2: typ.10kΩ) and an external capacitor (C1). (Refer to Figure 24)
In case of entering the normal operation mode after that, HP bit changes from “0” to “1”.
In the Power-Down-Mode ( PD pin = “L” or HPP bit = “0”), output voltage of HPL and HPR pins gradually change from
AGND to HVCM voltage by the time constants of an internal resistor (R2:typ.10kΩ) and an external capacitor (C1).
(Refer to Figure 25)
HP
HP
HP
-
HP
+
R1
HPP
HPL/HPR
C1
R2
Figure 23. Headphone-Amps Normal Operation
HP
HP
HP
HP
-
+
R1
HPP
HPL/HPR
C1 R2
Figure 24. Headphone-Amps Power-Save-Mode
HP
HP
HP
HP
-
+
R1
HPP
HPL/HPR
C1 _R2
Figure 25. Headphone-Amps Power-Down-Mode
MS0028-E-00
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2000/05