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參數(shù)資料
| 型號(hào)： | TS4994IST |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | LEAD FREE, MINI, SO-8 |
| 文件頁數(shù)： | 18/35頁 |
| 文件大小： | 483K |
| 代理商： | TS4994IST |
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TS4994
Application information
25/35
The two following graphs show typical applications of the TS4994 with a random selection of
four
ΔR/R values with a 0.1% tolerance.
4.6
CMRR performance
For calculating CMRR performance, we consider that Cin and Cfeed have no influence. Cb
has no influence in the calculation of the CMRR.
We use the same kind of resistor (same tolerance) and
ΔR is the tolerance value in %.
The following CMRR equation is valid for frequencies ranging from DC to about 1kHz.
The CMRR equation is (
ΔR in %):
Example: With
ΔR = 1%, the minimum CMRR is -34dB.
This example is a worst case scenario where each resistor has extreme tolerance. Ut
illustrates the fact that for CMRR, good matching is essential.
As with the PSRR, due to self-generated noise, the TS4994 CMRR limitation is about
-110dB.
worst-case conditions (
ΔR=0.1%).
Figure 73.
PSRR vs. frequency with random
choice condition
Figure 74.
PSRR vs. frequency with random
choice condition
100
1000
10000
-140
-130
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
Cb=0.1
μF
Cb=1
μF
Cb=0
20k
20
Cb=0.47
μF
Vcc = 5V, Vripple = 200mVpp
Av = 1, Cin = 4.7
μF
ΔR/R ≤ 0.1%, RL ≥ 8Ω
Tamb = 25
°C, Inputs = Grounded
PSRR
(
d
B)
Frequency (Hz)
100
1000
10000
-140
-130
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
Cb=0.1
μF
Cb=1
μF
Cb=0
20k
20
Cb=0.47
μF
Vcc = 2.5V, Vripple = 200mVpp
Av = 1, Cin = 4.7
μF
ΔR/R ≤ 0.1%, RL ≥ 8Ω
Tamb = 25
°C, Inputs = Grounded
PSRR
(
d
B)
Frequency (Hz)
)
dB
(
)
R
10000
(
200
R
Log
20
CMRR
2
Δ
×
Δ
×
≤
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
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| TS4998 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2 x 1W differential input stereo audio amplifier |
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