AK4642EN Datasheet, PDF (47/83 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP/SPK-AMP

ASAHI KASEI
[AK4642EN]
„ Headphone Output
Power supply voltage for the Headphone-Amp is supplied from the HVDD pin and centered on the HVDD/2 voltage. The
load resistance is 16Ω (min). HPG bit selects the output voltage (see Table 38).
HPG bit
0
1
Output Voltage [Vpp]
0.6 x AVDD
0.91 x AVDD
Table 38. Headphone-Amp Output Voltage
When the HPMTN bit is “0”, the common voltage of Headphone-Amp falls and the outputs (HPL and HPR pins) go to
“L” (HVSS). When the HPMTN bit is “1”, the common voltage rises to HVDD/2. A capacitor between the MUTET pin
and ground reduces pop noise at power-up. Rise/Fall time constant is in proportional to HVDD voltage and the capacitor
at MUTET pin.
[Example]: A capacitor between the MUTET pin and ground = 1.0µF, HVDD=3.3V:
Rise/fall time constant: τ = 100ms(typ), 250ms(max)
Time until the common goes to HVSS when HPMTN bit = “1” Æ “0”: 500ms(max)
When PMHPL and PMHPR bits are “0”, the Headphone-Amp is powered-down, and the outputs (HPL and HPR pins) go
to “L” (HVSS).
PMHPL bit,
PMHPR bit
HPMTN bit
HPL pin,
HPR pin
(1) (2)
(3)
(4)
Figure 31. Power-up/Power-down Timing for Headphone-Amp
(1) Headphone-Amp power-up (PMHPL, PMHPR bit = “1”). The outputs are still HVSS.
(2) Headphone-Amp common voltage rises up (HPMTN bit = “1”). Common voltage of Headphone-Amp is rising.
(3) Headphone-Amp common voltage falls down (HPMTN bit = “0”). Common voltage of Headphone-Amp is falling.
(4) Headphone-Amp power-down (PMHPL, PMHPR bit = “0”). The outputs are HVSS. If the power supply is switched
off or Headphone-Amp is powered-down before the common voltage goes to HVSS, some POP noise occurs.
MS0420-E-00
- 47 -
2005/09