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參數資料
| 型號： | 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： | 15/35頁 |
| 文件大小： | 483K |
| 代理商： | TS4994IST |
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Application information
TS4994
22/35
the values of VCC, Rin and Rfeed (AV). To have a good estimation of the VICM value, use the
following formula:
with
The result of the calculation must be in the range:
If the result of the VICM calculation is not in this range, an input coupling capacitor must be
used.
Example: With VCC=2.5V, Rin =Rfeed = 20k and Vic = 2V, we find VICM = 1.63V. This is
higher than 2.5V - 0.9V = 1.6V, so input coupling capacitors are required. Alternatively, you
can change the Vic value.
4.4
Low and high frequency response
In the low frequency region, Cin starts to have an effect. Cin forms, with Rin, a high-pass filter
with a -3dB cut-off frequency. FCL is in Hz.
In the high-frequency region, you can limit the bandwidth by adding a capacitor (Cfeed) in
parallel with Rfeed. It forms a low-pass filter with a -3dB cut-off frequency. FCH is in Hz.
While these bandwidth limitations are in theory attractive, in practice, because of low
performance in terms of capacitor precision (and by consequence in terms of mismatching),
they deteriorate the values of PSRR and CMRR.
The influence of mismatching on PSRR and CMRR performance is discussed in more detail
in the following sections.
Example: A typical application with input coupling and feedback capacitor with FCL =50Hz
and FCH = 8kHz. We assume that the mismatching between Rin1,2 and Cfeed1,2 can be
neglected. If we sweep the frequency from DC to 20kHz we observe the following with
respect to the PSRR value:
●
From DC to 200Hz, the Cin impedance decreases from infinite to a finite value and the
Cfeed impedance is high enough to be neglected. Due to the tolerance of Cin1,2, we
V
ICM
V
CC
R
in
×
2V
ic
R
feed
×
+
2R
in
R
feed
+
()
×
--------------------------------------------------------------------------
(V)
=
V
ic
Diff
input+
Diff
input-
+
2
-------------------------------------------------------
(V)
=
0.6V V
ICM
V
CC
0.9V
–
≤≤
)
Hz
(
C
R
2
1
F
in
CL
×
π
×
=
)
Hz
(
C
R
2
1
F
feed
CH
×
π
×
=
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相關代理商/技術參數 |
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|---|---|
| TS4995 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1.2 W fully differential audio power amplifier with selectable standby and 6 dB fixed gain |
| TS4995EIJT | 功能描述:音頻放大器 1.2W input/output Diff Audio Pwr Amp RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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| TS4997IQT | 功能描述:音頻放大器 Stereo w/3D effects RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| 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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