參數(shù)資料
型號: TS4890IS
元件分類: 音頻放大器
英文描述: AUDIO AMPLIFIER|SINGLE|BIPOLAR|TSSOP|8PIN|PLASTIC
中文描述: 音頻放大器|單|雙極| TSSOP封裝| 8引腳|塑料
文件頁數(shù): 29/31頁
文件大小: 432K
代理商: TS4890IS
TS4890
29/31
I
Note on PSRR measurement
What is the PSRR
The PSRR is the Power Supply Rejection Ratio.
It’sa kind of SVR ina 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 we measure the PSRR
Fig. 106 : 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 voltageis 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.
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
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