AK4648 Datasheet, PDF (73/119 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP/SPK-AMP

[AK4648]
<Wired OR with External Headphone-Amp>
When PMVCM=PMHPL=PMHPR bits = “0” and HPZ bit = “1”, Headphone-Amp is powered-down and HPL/R pins are
pulled-down to VSS2 by 200kΩ (typ.). In this setting, it is available to connect Headphone-Amp of the AK4648 and
external single supply Headphone-Amp by “wired OR” and the output level of external HP-Amp should be from “ -0.3V”
to “HVDD+0.3V”. In this mode, power supply current is 20μA(typ.). This function is not supported in Pseudo Cap-less
Mode.
PMVCM
x
0
1
1
PMHPL/R
0
0
1
1
HPMTN
HPZ
Mode
x
0
Power-down & Mute
x
1
Power-down
0
x
Mute
1
x
Normal Operation
Table 63. HP-Amp Mode Setting (x: Don’t care)
HPL/R pins
VSS2
Pull-down by 200kΩ
VSS2
Normal Operation
(default)
AK4648
HPL pin
HPR pin
Headphone
Another
HP-Amp
Figure 55. Wired OR with External Headphone-Amp
MS0625-E-01
- 73 -
2007/06