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參數(shù)資料
| 型號(hào)： | AK4534VN |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | 16Bit CODEC with MIC/HP/SPK-AMP |
| 中文描述： | 16位編解碼器麥克風(fēng)/惠普/胰腎聯(lián)合移植腺苷 |
| 文件頁數(shù)： | 30/64頁 |
| 文件大?。?/td> | 443K |
| 代理商： | AK4534VN |
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ASAHI KASEI
[AK4534]
MS0133-E-03
2003/5
- 30 -
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 13. 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 19 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.
AK4534
HP-AMP
16
Headphone
10
0.22
μ
R
C
Figure 14. External Circuit Example of Headphone
Output Power [mW]
3.0V
12.5
6.3
12.5
6.3
R [
]
C [
μ
F]
fc [Hz]
BOOST=OFF
148.5
105.8
69.8
49.7
Table 19. External Circuit Example
fc [Hz]
BOOST=MID
60
43
26
20
2.7V
10.1
5.1
10.1
5.1
3.3V
15.0
7.7
15.0
7.7
6.8
16
6.8
16
47
47
100
100
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AK4536 | 16-Bit Mono CODEC with ALC & MIC/SPK-AMP |
| AK4536VN | 16-Bit Mono CODEC with ALC & MIC/SPK-AMP |
| AK4537 | 16-Bit ツヒ Stereo CODEC with MIC/HP/SPK-AMP |
| AK4537VN | 16-Bit ツヒ Stereo CODEC with MIC/HP/SPK-AMP |
| AK4538 | 16Bit DS CODEC with MIC/HP/SPK-AMP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AK4534VQ | 功能描述:IC CODEC 16BIT MIC/HP/SPK-AMP 制造商:akm semiconductor inc. 系列:* 零件狀態(tài):上次購買時(shí)間 標(biāo)準(zhǔn)包裝:1,000 |
| AK4536 | 制造商:AKM 制造商全稱:AKM 功能描述:16-Bit Mono CODEC with ALC & MIC/SPK-AMP |
| AK4536VN | 制造商:AKM 制造商全稱:AKM 功能描述:16-Bit Mono CODEC with ALC & MIC/SPK-AMP |
| AK4537 | 制造商:AKM 制造商全稱:AKM 功能描述:16-Bit ΔΣ Stereo CODEC with MIC/HP/SPK-AMP |
| AK4537VN | 制造商:AKM 制造商全稱:AKM 功能描述:16-Bit ΔΣ Stereo CODEC with MIC/HP/SPK-AMP |
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