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TS4994FC データシート(PDF) 27 Page - STMicroelectronics

部品番号 TS4994FC
部品情報  1.2 W differential input/output audio power amplifier with selectable standby
PDF  35 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS4994FC データシート(HTML) 27 Page - STMicroelectronics

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TS4994FC
Application information
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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.
Figure 94 and Figure 95 show CMRR versus frequency and versus bypass capacitor Cb in
worst-case conditions (
ΔR=0.1%).
Figure 92.
PSRR vs. frequency with random
choice condition
Figure 93.
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
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
Frequency (Hz)
)
dB
(
)
R
10000
(
200
R
Log
20
CMRR
2 ⎥
⎦
⎤
⎢
⎣
⎡
Δ
−
×
Δ
×
≤



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