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參數(shù)資料
| 型號(hào)： | AK4564VQ |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | 16BIT CODEC WITH BUILT-IN ALC AND MIC/HP/SPK-AMP |
| 中文描述： | 16位編解碼器，配有ALC和麥克風(fēng)/惠普/胰腎聯(lián)合移植腺苷 |
| 文件頁數(shù)： | 22/48頁 |
| 文件大?。?/td> | 382K |
| 代理商： | AK4564VQ |
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ASAHI KASEI
[AK4564]
MS0140-E-01
2002/07
- 22 -
Headphone-Amps are powered-up/down by HPP bit. When HPP bit is “0”, Headphone-Amps are powered-down and
HPL and HPR pins are fixed to “L” (AVSS). At power-up/down, the common voltage of HPL/HPR pin is settled by a
constant which determined by the internal resistor and the external capacitors. The internal resistor is 50k
(typ) at
power-up, and 1k
(typ) at power-down. (Refer to Figure 16)
Rising Time of Headphone-Amp:
τ
1 = 50k
x C1
Falling Time of Headphone-Amp:
τ
2= 1k
x (C1 + 2 x C2)
For example; C1 = 4.7
μ
F, C2 = 100
μ
F
τ
1 = 235ms
τ
2 = 205ms
+
-
+
HP-Amp
16
16
C2
HPL, HPR
MUTET
+
C1
HPMIX bit
HPDAC bit
BEEP2H bit
From MIX1
From DAC
From BEEP2
Figure 16. Headphone-Amp internal equivalent circuit
HPP bit
HPDAC, HPMIX or BEEP2H bit
HPL/HPR pin
(1) (2)
(4)
(3)
τ
1
τ
2
Figure 17. Headphone-Amp Power-Up/Down Timing
(1) Power-up Headphone-Amps: WR (HPP= “1”)
The common voltage of HPL/HPR pins rises by the time constant. (
τ
1)
(2) Enable Headphone-Amp inputs: WR (HPDAC, HPMIX or BEEP2H =“1”)
The input signals from MIX1, DAC and BEEP2 are output. Headphone-Amps can output the signals while the
common voltage is rising.
(3) Disable Headphone-Amp inputs: WR (HPDAC=HPMIX=BEEP2H=“0”)
The input signal from MIX1, DAC and BEEP2 are muted. Headphone-Amps output HVCM voltage during muting.
(4) Power-down Headphone-Amps: WR (HPP=“0”)
The common voltage of HPL/HPR pins falls by the time constant. (
τ
2)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AKD4564 | 16BIT CODEC WITH BUILT-IN ALC AND MIC/HP/SPK-AMP |
| AK4565 | LOW POWER 20BIT CODEC WITH BUILT IN ALC |
| AK4565VF | LOW POWER 20BIT CODEC WITH BUILT IN ALC |
| AK4566 | 20bit Stereo CODEC with built-in IPGA & HP-AMP |
| AK4566VN | 20bit Stereo CODEC with built-in IPGA & HP-AMP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AK4565 | 制造商:AKM 制造商全稱:AKM 功能描述:LOW POWER 20BIT CODEC WITH BUILT IN ALC |
| AK4565VF | 制造商:AKM 制造商全稱:AKM 功能描述:LOW POWER 20BIT CODEC WITH BUILT IN ALC |
| AK4566 | 制造商:AKM 制造商全稱:AKM 功能描述:20bit Stereo CODEC with built-in IPGA & HP-AMP |
| AK4566VN | 制造商:AKM 制造商全稱:AKM 功能描述:20bit Stereo CODEC with built-in IPGA & HP-AMP |
| AK4568AER | 功能描述:IC CODEC LOW POWER 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 |
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