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参数资料
| 型号： | TS4871EIDT |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封装： | SOP-8 |
| 文件页数： | 18/29页 |
| 文件大小： | 1556K |
| 代理商： | TS4871EIDT |
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TS4871
25/28
s Note on how to use the PSRR curves
(page 7)
We have finished a design and we have chosen
the components values :
Rin=Rfeed=22k
Cin=100nF
Cb=1F
Now, on fig. 13, we can see the PSRR (input
grounded) vs frequency curves. At 217Hz we have
a PSRR value of -36dB.
In reality we want a value about -70dB. So, we
need a gain of 34dB !
Now, on fig. 12 we can see the effect of Cb on the
PSRR (input grounded) vs. frequency. With
Cb=100F, we can reach the -70dB value.
The process to obtain the final curve (Cb=100F,
Cin=100nF, Rin=Rfeed=22k
) is a simple transfer
point by point on each frequency of the curve on
fig. 13 to the curve on fig. 12. The measurement
result is shown on the next figure.
Fig. 85 : PSRR changes with Cb
What is the PSRR ?
The PSRR is the Power Supply Rejection Ratio.
It's a kind of SVR in a determined frequency range.
The PSRR of a device, is the ratio between a
power supply disturbance and the result on the
output. We can say that the PSRR is the ability of
a device to minimize the impact of power supply
disturbances to the output.
How do we measure the PSRR ?
Fig. 86 : PSRR measurement schematic
s Principle of operation
We fixed the DC voltage supply (Vcc), the AC
sinusoidal ripple voltage (Vripple) and no supply
capacitor Cs is used
The PSRR value for each frequency is:
Remark : The measure of the Rms voltage is not a
Rms selective measure but a full range (2 Hz to
125 kHz) Rms measure. It means that we
measure the effective Rms signal + the noise.
sHigh/low cut-off frequencies
For their calculation, please check this "Frequency
Response Gain vs Cin, & Cfeed" graph:
10
100
1000
10000
100000
-70
-60
-50
-40
-30
Cin=100nF
Cb=100
F
Cin=100nF
Cb=1
F
Vcc = 5, 3.3 & 2.6V
Rfeed = 22k, Rin = 22k
Rg = 100
, RL = 8
Tamb = 25
°C
P
S
RR
(
d
B)
Frequency (Hz)
Vripple
Vcc
Rin
Cin
Rg
100 Ohms
Cb
Rfeed
4
3
2
1
5
8
Vin-
Vin+
-
+
-
+
Bypass
Standby
Bias
6
Vout1
Vout2
Av=-1
TS4871
Vs-
Vs+
RL
Vcc
GND
7
PSRR d B
() = 20 x Log
10
Rm s Vrippl e
()
Rm s Vs + - Vs-
()
---------------------------------------------
10
100
1000
10000
-25
-20
-15
-10
-5
0
5
10
Rin = Rfeed = 22k
Tamb = 25
°C
Cfeed = 2.2nF
Cfeed = 680pF
Cfeed = 330pF
Cin = 470nF
Cin = 82nF
Cin = 22nF
G
a
in
(dB
)
Frequency (Hz)
相关PDF资料 |
PDF描述 |
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| TS4871IDT | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TS4871ID | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TS4871IST | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TS4871IQT | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, DSO8 |
| TS4871IS | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TS4871ID | 功能描述:音频放大器 1W Audio Power 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 |
| TS4871ID | 制造商:STMicroelectronics 功能描述:Operational Amplifier (Op-Amp) IC |
| TS4871IDT | 功能描述:音频放大器 1W Audio Power 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 |
| TS4871IQT | 功能描述:音频放大器 1W Mono Audio Power Amplifier 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 |
| TS487-1IQT | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Amplifier. Other |
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