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參數(shù)資料
| 型號： | AK4538 |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | 16Bit DS CODEC with MIC/HP/SPK-AMP |
| 中文描述： | 16位副編解碼器麥克風(fēng)/惠普/胰腎聯(lián)合移植腺苷 |
| 文件頁數(shù)： | 33/70頁 |
| 文件大小： | 485K |
| 代理商： | AK4538 |
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ASAHI KASEI
[AK4538]
MS0198-E-01
2003/5
- 33 -
n
Headphone Output
Power supply voltage for the Headphone-amp is supplied from the HVDD pin and centered on the HVDD/2 voltage. The
Headphone output load resistance is min.20
. When the HPL and HPR bits are “1”, output signals are muted and the HPL
and HPR pins output HVDD/2 voltage. When the HPL and HPR bits are “0”, the Headphone-amps are in normal
operation. When the PMHPL and PMHPR bits are “0”, the Headphone-amp is powered down and the outputs (HPL and
HPR pins) go to “L” (HVSS). A capacitor between the MUTET pin and ground reduces pop noise at power-up.
[Example] : A capacitor between the MUTET pin and ground = 1.0
μ
F, a capacitor between the HPL (HPR) pin and
Headphone = 47
μ
F
Time constant of rise time:
τ
r
= 100ms, Time constant of fall time:
τ
f
= 188ms
PMHPL/R bits
HPL/R pins
(1)
(2)
τ
r
τ
f
Figure 26. Power-up/Power-down Timing for Headphone-amp
Note: The HPL and HPR bits should be kept to “0” during power-up.
(1) PMHPL and PMHPR bits = “1”
Headphone-amp is powered up. Common voltage of Headphone-amp is rising. This rise time depends on the capacitor
value connected with the MUTET pin. The time constant is
τ
r
= 100k x C when the capacitor value on MUTET pin is
“C”.
(2) PMHPL and PMHPR bits = “0”
Headphone-amp is powered down. Common voltage is falling. This fall time depends on the internal resistor and the
capacitor value of HPL/R pins. The time constant is
τ
f
= 2k x (2 x C) when the capacitor value on HPL(HPR) pin is “C”.
If the power supply is powered off or Headphone-Amp is powered-up again before the common voltage goes to GND,
some POP noise occurs. It takes 5times of
τ
f
that the common voltage goes to GND.
The cut-off frequency of Headphone-amp output depends on the external resistor and capacitor used. Table 18 shows the
cut off frequency and the output power for various resistor/capacitor combinations. The headphone impedance R
L
is 16
.
Output powers are shown at HVDD = 2.7, 3.0 and 3.3V. The output voltage of headphone is 0.6 x AVDD (Vpp).
When an external resistor R is smaller than 12
, put an oscillation prevention circuit (0.22
μ
F+10
) because it has the
possibility that Headphone-amp oscillates.
AK4538
HP-AMP
16
Headphone
10
0.22
μ
R
C
Figure 27. External Circuit Example of Headphone
Output Power [mW]
3.0V
12.4
6.0
12.4
6.0
R [
]
C [
μ
F]
fc [Hz]
BOOST=OFF
152.5
105.8
71.2
49.7
Table 23. External Circuit Example
fc [Hz]
BOOST=MID
63
43
27
20
2.7V
10.0
4.8
10.0
4.8
3.3V
15.0
7.2
15.0
7.2
6.2
16
6.2
16
47
47
100
100
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AK4538VN | 16Bit DS CODEC with MIC/HP/SPK-AMP |
| AK4541VQ | AC’97 Rev 2.1 Multimedia Audio CODEC |
| AK4541 | AC’97 Rev 2.1 Multimedia Audio CODEC |
| AK4543 | AC’97 Rev 2.1 Multimedia Audio CODEC |
| AK4543VQ | AC’97 Rev 2.1 Multimedia Audio CODEC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AK4538VN | 制造商:AKM 制造商全稱:AKM 功能描述:16Bit DS CODEC with MIC/HP/SPK-AMP |
| AK4541 | 制造商:AKM 制造商全稱:AKM 功能描述:AC’97 Rev 2.1 Multimedia Audio CODEC |
| AK4541VQ | 制造商:AKM 制造商全稱:AKM 功能描述:AC’97 Rev 2.1 Multimedia Audio CODEC |
| AK4543 | 制造商:AKM 制造商全稱:AKM 功能描述:AC’97 Rev 2.1 Multimedia Audio CODEC |
| AK4543VQ | 制造商:AKM 制造商全稱:AKM 功能描述:AC’97 Rev 2.1 Multimedia Audio CODEC |
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