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参数资料
| 型号： | TS489IQT |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 0.13 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封装： | 2 X 2 MM, DFN-8 |
| 文件页数： | 19/32页 |
| 文件大小： | 570K |
| 代理商： | TS489IQT |
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Application information
TS488-TS489
26/32
4.8
Wake-up time
When the standby is released to put the device ON, the bypass capacitor Cb is charged
immediately. As Cb is directly linked to the bias of the amplifier, the bias will not work
properly until the Cb voltage is correct. The time to reach this voltage plus a time delay of
20ms (pop precaution) is called the wake-up time or tWU; it is specified in the electrical
characteristics table with Cb = 1F.
If Cb has a value other than 1F, tWU can be calculated by applying the following formulas or
can be read directly from Figure 83.
Figure 83.
Typical wake-up time vs. bypass capacitance
Note:
It is assumed that the Cb voltage is equal to 0V. If the Cb voltage is not equal to 0V, the
wake-up time is shorter.
4.9
POP performance
Pop performance is closely related to the size of the input capacitor Cin. The size of Cin is
dependent on the lower cut-off frequency and PSRR values requested.
In order to reach low pop, Cin must be charged to VCC/2 in less than 20ms. To follow this
rule, the equivalent input constant time (RinCin) should be less then 6.7ms:
τ in = Rin xCin < 0.0067 (s)
Example calculation:
In the typical application schematic Rin is 20kΩ and Cin is 330nF. The lower cut-off frequency
(-3db attenuation) is given by the following formula:
t
WU
C
b
2.5
0.03125
----------------------
20
[ms;
μF ]
+
=
012
345
0
50
100
150
200
250
300
350
400
T
AMB
=25°C
Wa
ke-up
Time
(ms)
Cb (
μF)
F
CL
1
2
π R
in
C
in
--------------------------------------
=
相关PDF资料 |
PDF描述 |
|---|---|
| TS489IST | 0.13 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TS4890IDT | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TS4890ID | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TS4890IST | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TS4890IQT | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, DSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TS489IST | 功能描述:音频放大器 Popfree 100mW stereo headphone amp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TS4900 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:300mW at 3.3V SUPPLY AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE HIGH |
| TS4900ID | 功能描述:音频放大器 300mW Audio Pwr Amp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TS4900IDT | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:300mW at 3.3V SUPPLY AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE HIGH |
| TS4900IS | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:300mW at 3.3V SUPPLY AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE HIGH |
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