- 您现在的位置：买卖IC网 > PDF目录373708 > TS4890 (意法半导体) RAIL TO RAIL OUTPUT 1W AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE LOW PDF资料下载
参数资料
| 型号： | TS4890 |
| 厂商： | 意法半导体 |
| 英文描述： | RAIL TO RAIL OUTPUT 1W AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE LOW |
| 中文描述： | 轨至轨输出1W的音频功率放大器，具有备用模式有源低 |
| 文件页数： | 29/32页 |
| 文件大小： | 833K |
| 代理商： | TS4890 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页当前第29页第30页第31页第32页
TS4890
29/32
I
Note on how to use the PSRR curves
(page 8)
We have finished a design and we have chosen for
the components :
Rin=Rfeed=22k
Cin=100nF
Cb=1μF
Now, on fig. 16, 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. 15 we can see the effect of Cb on the
PSRR (input grounded) vs. frequency. With
Cb=100μF, we can reach the -70dB value.
The process to obtain the final curve (Cb=100μF,
Cin=100nF, Rin=Rfeed=22k
) is a simple transfer
point by point on each frequency of the curve on
fig. 16 to the curve on fig. 15.
The measurement result is shown on the next
figure.
Fig. 107 : PSRR changes with Cb
I
Note on PSRR measurement
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. 108 : PSRR measurement schematic
I
Principle of operation
We fixed the DC voltage supply (Vcc)
We fixed the AC sinusoidal ripple voltage
(Vripple)
No bypass 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.
10
100
1000
10000
100000
-70
-60
-50
-40
-30
Cin=100nF
Cb=100
μ
F
Cin=100nF
Cb=1
μ
F
Vcc = 5 & 2.2V
Rfeed = 22k, Rin = 22k
Rg = 100
, RL = 8
Tamb = 25
°
C
P
Frequency (Hz)
Vripple
Vcc
Rin
Cin
Rg
100 Ohms
Cb
Rfeed
4
3
2
1
5
8
Vin-
Vin+
-
+
-
Av=-1
+
Bypass
Standby
Bias
6
Vout1
Vout2
TS4890
Vs-
Vs+
RL
V
G
7
×
=
+
)
Vs
Vs
(
Rms
)
V
(
Rms
Log
20
)
dB
(
PSRR
ripple
10
相关PDF资料 |
PDF描述 |
|---|---|
| TS4890IQT | RAIL TO RAIL OUTPUT 1W AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE LOW |
| TS4890ID | RAIL TO RAIL OUTPUT 1W AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE LOW |
| TS4890IDT | RAIL TO RAIL OUTPUT 1W AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE LOW |
| TS4900 | 300mW at 3.3V SUPPLY AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE HIGH |
| TS4900ID | 300mW at 3.3V SUPPLY AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE HIGH |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TS4890ID | 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 |
| TS4890IDT | 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 |
| TS4890IQT | 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 |
| TS4890IS | 制造商:未知厂家 制造商全称:未知厂家 功能描述:AUDIO AMPLIFIER|SINGLE|BIPOLAR|TSSOP|8PIN|PLASTIC |
| TS4890IST | 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 |
发布紧急采购，3分钟左右您将得到回复。