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| 型號： | TPA6211A1DGN |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2.45 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | GREEN, PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 8/32頁 |
| 文件大小： | 916K |
| 代理商： | TPA6211A1DGN |
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f
c(HPF) +
1
2p 10 kW C
I
(8)
C
I +
1
2p 10 kW f
c(HPF)
(9)
C
I +
1
2p R
I
fc
(3)
f
c(LPF) +
1
2p Ra Ca
(10)
Ca +
1
2p 1k
f
c(LPF)
(11)
f
c(LPF) +
1
2p R
F
C
F
where R
F
is the internal 40 kW resistor
(4)
f
c(LPF) +
1
2p 40 kW C
F
(5)
C
F +
1
2p 40 kW f
c(LPF)
(6)
9 dB
fc(HPF) = 100 Hz
12 dB
AV
+20 dB/dec
40 dB/dec
20 dB/dec
f
fc(LPF) = 10 kHz
f
c(HPF) +
1
2p R
I
C
I
where R
I
is the input resistor
(7)
SLOS367C – AUGUST 2003 – REVISED JUNE 2008........................................................................................................................................................ www.ti.com
directly affects the bass (low frequency) performance
of the circuit. Consider the example where RI is 10
k
and the specification calls for a flat bass response
down to 100 Hz. Equation 2 is reconfigured as
Therefore,
Substituting 100 Hz for fc(HPF) and solving for CI:
In this example, CI is 0.16 F, so the likely choice
CI = 0.16 F
ranges from 0.22
F to 0.47 F. Ceramic capacitors
are preferred because they are the best choice in
At this point, a first-order band-pass filter has been
preventing
leakage
current.
When
polarized
created with the low-frequency cutoff set to 100 Hz
capacitors are used, the positive side of the capacitor
and the high-frequency cutoff set to 10 kHz.
faces the amplifier input in most applications. The
The process can be taken a step further by creating a
input dc level is held at VDD/2, typically higher than
second-order high-pass filter. This is accomplished by
the source dc level. It is important to confirm the
placing a resistor (Ra) and capacitor (Ca) in the input
capacitor polarity in the application.
path. It is important to note that Ra must be at least
10 times smaller than RI; otherwise its value has a
Band-Pass Filter (Ra, Ca, and Ca)
noticeable effect on the gain, as Ra and RI are in
It may be desirable to have signal filtering beyond the
series.
one-pole high-pass filter formed by the combination of
CI and RI. A low-pass filter may be added by placing
Step 3: Additional Low-Pass Filter
a capacitor (CF) between the inputs and outputs,
Ra
must
be
at
least
10x
smaller
than
RI,
forming a band-pass filter.
Set Ra = 1 k
An example of when this technique might be used
would be in an application where the desirable
pass-band range is between 100 Hz and 10 kHz, with
a gain of 4 V/V. The following equations illustrate how
Therefore,
the proper values of CF and CI can be determined.
Step 1: Low-Pass Filter
Substituting 10 kHz for fc(LPF) and solving for Ca:
Ca = 160 pF
Figure 32 is a bode plot for the band-pass filter in the
previous example. Figure 31 shows how to configure
the TPA6211A1 as a band-pass filter.
Therefore,
Substituting 10 kHz for fc(LPF) and solving for CF:
CF = 398 pF
Step 2: High-Pass Filter
Figure 32. Bode Plot
Decoupling Capacitor (CS)
Since the application in this case requires a gain of
The TPA6211A1 is a high-performance CMOS audio
4 V/V, RI must be set to 10 k.
amplifier
that
requires
adequate
power
supply
Substituting RI into equation 6.
decoupling to ensure the output total harmonic
distortion (THD) is as low as possible. Power-supply
decoupling also prevents oscillations for long lead
16
Copyright 2003–2008, Texas Instruments Incorporated
Product Folder Link(s): TPA6211A1
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| TPA6211A1DGNRG4 | 2.45 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TPA6211A1DGNG4 | 2.45 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TPA6211A1DRBG4 | 2.45 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA6211A1DGNG4 | 功能描述:音頻放大器 Mono Fully Diff Class-AB RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA6211A1DGNR | 功能描述:音頻放大器 Mono Fully Diff Class-AB RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA6211A1DGNRG4 | 功能描述:音頻放大器 Mono Fully Diff Class-AB RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA6211A1DRB | 功能描述:音頻放大器 Mono Fully Diff Class-AB RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA6211A1DRBG4 | 功能描述:音頻放大器 Mono Fully Diff Class-AB RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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