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參數(shù)資料
| 型號(hào)： | AK4201EU |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.065 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO12 |
| 封裝： | 2.90 X 2.20 MM, 0.50 MM PITCH, USON-12 |
| 文件頁(yè)數(shù)： | 2/13頁(yè) |
| 文件大?。?/td> | 239K |
| 代理商： | AK4201EU |
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[AK4201]
MS1077-E-00
2009/05
- 10 -
■ Power-Up/Down Sequence
The PDN pin must keep “L” until all power supply pins (AVDD, PVDD) are supplied, and must be set to “H” after.
Power Supply
PDN pin
PVEE pin
LOUT/ROUT pins
(1)
0V
PVEE pin Output =-3.3V(Typ.)
0V
(2)
(3)
Normal Operation(0V Common)
0V
Don’t Care
Normal Operation
The Device in
front of AK4201
DAC etc
Don’t Care
(5)
The Device in
front of AK4201
Click noise
0V
Power Up
(No Signal Output)
(4)
A
Ta
Figure 4. Power-up/down Sequence example
(1) The interval from power Up to PDN pin = “L” → “H”
“L” time of 150ns or more is needed to reset the AK4201.
The power should be ON when the PDN pin = “L”. The PDN pin should be set to “H” after power supply
(AVDD, PVDD) are ON.
(2) The interval from power-up of the signal source device in front of the AK4201 to the AK4201’s PDN pin transition
from “L” to “H”
The other device should be powered up with no signal (e.g. MUTE). When a step wave (an instant DC level change)
is output from the other device at the power-up, a high pass filter response wave will occur at “A” timing of Figure
4, according to the time constant of the input coupling capacitor (Ci) and the input resistor(Ri) in front of the
AK4201. In order to prevent this pop noise through the AK4201, a wait time “Ta” is required after the other devices
are powered-up. The AK4201 can attenuate pop noises of the other device by a built-in mute circuit during
shutdown mode (PDN pin= “L”).
Ta calculation example: (in the case of Ci =0.22uF, Ri = 20k)
τ=0.22u * 20k = 4.4ms
Ta =τ* 7.6 = 33ms
(When noise level by former device= 2V, response wave level= 1mV. 7.6*τ is needed)
If a waiting time is not sufficient, a pop noise might occur, but there is no problem for the normal operation.
(3) The AK4201 is in normal operation 50ms (max) after the PDN pin goes to “H”. The other device in front of the
AK4201 should be still muted during this interval (50ms).
(4) The other device in front of the AK4201 should start outputting the signal after the AK4201 starts Normal
Operation. If click noise is generated by former device when MUTE is canceled, it will be output from the AK4201.
(5) The PDN pin = “L”. LOUT/ROUT pins short to VSS1 with 20(typ.). After 50ms (max.), the PVEE pin will be 0V
according to a capacitor which connected to PVEE and internal resistance (typ. 17.5k). The AK4201 can be
powered up again after 150ns or more from the PDN pin = “L”.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AK4201EUP-L | 制造商:AKM Semiconductor Inc 功能描述:AK4201EUP-L |
| AK4203 | 制造商:AKM 制造商全稱:AKM 功能描述:Stereo Cap-less LINE-Amp and Video-Amp |
| AK4203ET | 制造商:AKM 制造商全稱:AKM 功能描述:Stereo Cap-less LINE-Amp and Video-Amp |
| AK4204 | 制造商:AKM 制造商全稱:AKM 功能描述:Stereo Cap-less LINE-Amp and Video-Amp |
| AK4204ET | 制造商:AKM 制造商全稱:AKM 功能描述:Stereo Cap-less LINE-Amp and Video-Amp |
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