AK4213 Datasheet, PDF (22/38 Pages) Asahi Kasei Microsystems – Mono Class-D SPK-Amp with Stereo Cap-less HP-Amp

[AK4213]
The headphone output is enabled when HPMTN bit is “1” and muted when HPMTN bit is “0”. The mute ON/OFF time is
set by PTS1-0 bits when MOFF bit is “0”. When MOFF bit is “1”, the mute ON/OFF is switched immediately.
When PMHPL and PMHPR bits are “0”, the headphone-amps are powered-down completely. At that time, the HPL and
HPR pins go to VSS3 voltage via the internal pulled-down resistor. The pulled-down resistor is 20Ω(typ) at HPZ bit =
“0”, 25kΩ(typ) at HPZ bit = “1”. The power-up time is 16.4ms (typ.) and 26.3ms (max.), and power up/down is executed
immediately.
PMCP/PMVCM
x
x
1
1
PMHPL/R HPMTN HPZ
Mode
HPL/R pins
0
x
0 Power-down & Mute Pulled-down by 20Ω (typ)
0
x
1
Power-down
Pulled-down by
25kΩ(typ)
1
0
0
Mute
VSS3
1
1
0
Normal Operation
Normal Operation
Table 14. Headphone amplifier Mode Setting (x: Don’t’ care)
(default)
<Wired OR with External Headphone-Amp>
When PMVCM=PMCP=PMOSC=HPZ bits are “1”(charge pump circuit is powered-up), the AK4213 HP-Amp can be
connected to external single supply HP-Amp by “wired OR”. The external HP-Amp can output the single up to ±PVDD
[Vpp] after the charge pump circuit is powered-up.
AK4213
HPL pin
HPR pin
Headphone
Another
HP-Amp
Figure 16. Wired OR with External HP-Amp
MS0949-E-01
- 22 -
2008/07