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參數(shù)資料
| 型號： | TS4872IJT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA8 |
| 封裝： | FCP-8 |
| 文件頁數(shù)： | 19/29頁 |
| 文件大小： | 1012K |
| 代理商： | TS4872IJT |
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Obsolete
Product(s)
- Obsolete
Product(s)
TS4872
26/29
NO
T
F
O
R
NEW
D
E
SIGN
Fig. 84 : PSRR changes with Cb
■ 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 we measure the PSRR ?
For PSRR measurement schematic see figure 85
Fig. 85 : PSRR measurement schematic
■ 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
F
Cin=100nF
Cb=1
F
Vcc = 5 & 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
1
7
3
5
8
4
Vin-
Vin+
-
+
-
+
Bypass
Standby
Bias
6
Vout1
Vout2
Av=-1
TS4872
Vs-
Vs+
RL
Vcc
GND
2
PSRR d B
() = 20 x Log
10
Rm s Vrippl e
()
Rm s Vs + - Vs-
()
---------------------------------------------
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