參數(shù)資料
型號(hào)： AK4367
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： OUTPUT MIXER & HP - AMP 24 BIT 2 CH DAC
中文描述： 輸出混音器
文件頁(yè)數(shù)： 11/38頁(yè)
文件大小： 433K
代理商： AK4367
ASAHI KASEI
[AK4367]
MS0247-E-01
2004/11
- 19 -
Headphone Output
Power supply voltage for the Headphone-amp is supplied from the HVDD pin and centered on the MUTET voltage. The
Headphone-amp output load resistance is min.16
. When the MUTEN bit is “1” at PMHPL=PMHPR= “1”, the common
voltage rises to 0.45 x VDD. When the MUTEN bit is “0”, the common voltage of Headphone-amp falls and the outputs
(HPL and HPR pins) go to VSS.
A capacitor between the MUTET pin and ground reduces pop noise at power-up/down. It is
recommended that the capacitor with small variation of capacitance and low ESR (Equivalent Series
Resistance) over all temperature range, since the rise and fall time in Table 9 depend on the
capacitance and ESR of the external capacitor at MUTET pin.
In case only one path is connected,
DAC or LIN/RIN/MIN.
In case both paths are connected,
DAC and LIN/RIN/MIN.
tr: Rise Time up to VCOM/2
100k x C (typ)
120k x C (typ)
tf: Fall Time down to 0V
200k x C (typ)
150k x C (typ)
Table 9. Headphone-Amp Rise/Fall Time
[Example] : A capacitor between the MUTET pin and ground = 1.0
F, and only DAC path is connected:
Time constant of rise time: tr = 100k x 1F = 100ms(typ)
Time constant of fall time: tf = 200k x 1F = 200ms(typ)
When PMHPL and PMHPR bits are “0”, the Headphone-amp is powered-down, and the outputs (HPL and HPR pins) go
to VSS.
MUTEN bit
PMHPL/R bit
HPL/R pin
(1) (2)
(4)
(3)
tr
tf
VCOM/2
VCOM
Figure 15. Power-up/Power-down Timing for Headphone-amp
(1) Headphone-amp power-up (PMHPL and PMHPR bits = “1”). The outputs are still VSS.
(2) Headphone-amp common voltage rises up (MUTEN bit = “1”). Common voltage of Headphone-amp is rising. This
rise time depends on the capacitor value connected with the MUTET pin. The rise time up to VCOM/2 is tr = 100k x
C(typ) when the capacitor value on MUTET pin is “C”.
(3) Headphone-amp common voltage falls down (MUTEN bit = “0”). Common voltage of Headphone-amp is falling to
VSS. This fall time depends on the capacitor value connected with the MUTET pin. The fall time down to 0V is tf =
200k x C(typ) when the capacitor value on MUTET pin is “C”.
(4) Headphone-amp power-down (PMHPL, PMHPR bits = “0”). The outputs are VSS. If the power supply is switched off
or Headphone-amp is powered-down before the common voltage goes to VSS, some pop noise occurs.
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