參數(shù)資料
型號(hào)： TPA102DGNRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 0.07 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO8
封裝： GREEN, PLASTIC, MSOP-8
文件頁(yè)數(shù)： 9/25頁(yè)
文件大?。?/td> 751K
代理商： TPA102DGNRG4
www.ti.com
APPLICATION INFORMATION
GAIN SETTING RESISTORS, R
f and Ri
f
c(highpass) +
1
2p R
i
C
i
(4)
Gain + *
R
f
R
i
(1)
C
i +
1
2p R
i fc(highpass)
(5)
Effective Impedance +
R
fRi
R
f ) Ri
(2)
POWER SUPPLY DECOUPLING, C
(S)
f
c(lowpass) +
1
2p R
f CF
(3)
INPUT CAPACITOR, C
i
TPA102
SLOS213D – AUGUST 1998 – REVISED SEPTEMBER 2004
The gain for the TPA102 is set by resistors Rf and Ri
The value of Ci directly affects the bass (low fre-
according to Equation 1.
quency) performance of the circuit. Consider the
example where Ri is 20 k and the specification calls
for a flat bass response down to 20 Hz. Equation 4 is
reconfigured as Equation 5.
Given that the TPA102 is a MOS amplifier, the input
impedance is very high. Consequently input leakage
currents are not generally a concern. However, noise
In this example, Ci is 0.40 F, so one would likely
in the circuit increases as the value of Rf increases.
choose a value in the range of 0.47 F to 1 F. A
In addition, a certain range of Rf values is required for
further consideration for this capacitor is the leakage
proper start-up operation of the amplifier. Considering
path from the input source through the input network
these factors, it is recommended that the effective
formed by Ri, Ci, and the feedback resistor (Rf) to the
impedance seen by the inverting node of the amplifier
load. This leakage current creates a dc offset voltage
be set between 5 k
and 20 k. The effective
at the input to the amplifier that reduces useful
impedance is calculated using Equation 2.
headroom, especially in high-gain applications (gain
>10). For this reason a low-leakage tantalum or
ceramic capacitor is the best choice. When polarized
capacitors are used, connect the positive side of the
capacitor to the amplifier input in most applications.
For example, if the input resistance is 20 k
and the
The dc level there is held at VDD/2—likely higher than
feedback resistor is 20 k
, the gain of the amplifier is
the source dc level. It is important to confirm the
-1, and the effective impedance at the inverting
capacitor polarity in the application.
terminal is 10 k
, a value within the recommended
range.
For high performance applications, metal-film re-
The TPA102 is a high-performance CMOS audio
sistors are recommended because they tend to have
amplifier that requires adequate power-supply de-
lower noise levels than carbon resistors. For values
coupling to minimize the output total harmonic distor-
of Rf above 50 k, the amplifier tends to become
tion (THD). Power-supply decoupling also prevents
unstable due to a pole formed from Rf and the
oscillations when long lead lengths are used between
inherent input capacitance of the MOS input struc-
the amplifier and the speaker. The optimum decoup-
ture. For this reason, a small compensation capacitor
ling is achieved by using two capacitors of different
of approximately 5 pF should be placed in parallel
types that target different types of noise on the power
with Rf. This, in effect, creates a low-pass filter
supply leads. For higher frequency transients, spikes,
network
with
the
cutoff
frequency
defined
by
or digital hash on the line, a good low equival-
Equation 3.
ent-series-resistance (ESR) ceramic capacitor, typi-
cally 0.1 F, placed as close as possible to the
device
VDD
lead,
works
best.
For
filtering
lower-frequency noise signals, a larger aluminum
For example, if Rf is 100 k and CF is 5 pF then
electrolytic capacitor of 10 F or greater placed near
fc(lowpass) is 318 kHz, which is well outside the audio
the power amplifier is recommended.
range.
In the typical application, an input capacitor, Ci, is
required to allow the amplifier to bias the input signal
to the proper dc level for optimum operation. In this
case, Ci and Ri form a high-pass filter with the corner
frequency determined in Equation 4.
17
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TPA112DG4 功能描述:音頻放大器 150mW Stereo 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
TPA112DGN 功能描述:音頻放大器 150mW Stereo 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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