參數(shù)資料
型號(hào)： TPA6205A1DGNG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 1.25 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
封裝： GREEN, PLASTIC, MSOP-8
文件頁(yè)數(shù)： 3/28頁(yè)
文件大?。?/td> 912K
代理商： TPA6205A1DGNG4
_
+
VDD
VO+
VO-
GND
ToBattery
Cs
Bias
Circuitry
IN-
IN+
SHUTDOWN
RI1
RF
CI1
CP
RP
RF
C(
)
BYPASS
(Optional)
CI2 R
I2
SingleEnded
Input1
SingleEnded
Input2
Input Capacitor (CI)
SELECTING COMPONENTS
Resistors (RF and RI)
Gain RF/RI
(1)
fc +
1
2pR
I
C
I
(2)
Bypass Capacitor (CBYPASS) and Start-Up Time
–3 dB
fc
C
I +
1
2pR
I
fc
(3)
www.ti.com.............................................................................................................................................................. SLOS490B–JULY 2006–REVISED JUNE 2008
Figure 31. Application Schematic With TPA6205A1 Summing Two Single-Ended Inputs
The TPA6205A1 does not require input coupling
capacitors if using a differential input source that is
biased from 0.5 V to VDD - 0.8 V. Use 1% tolerance
The input (RI) and feedback resistors (RF) set the
or better gain-setting resistors if not using input
gain of the amplifier according to Equation 1.
coupling capacitors.
In
the
single-ended
input
application
an
input
RF and RI should range from 1 k to 100 k. Most
capacitor, CI, is required to allow the amplifier to bias
graphs were taken with RF = RI = 20 k.
the input signal to the proper dc level. In this case, CI
and RI form a high-pass filter with the corner
Resistor matching is very important in fully differential
frequency determined in Equation 2.
amplifiers. The balance of the output on the reference
voltage depends on matched ratios of the resistors.
CMRR, PSRR, and the cancellation of the second
harmonic distortion diminishes if resistor mismatch
occurs. Therefore, it is recommended to use 1%
tolerance resistors or better to keep the performance
optimized.
The internal voltage divider at the BYPASS pin of this
device
sets
a
mid-supply
voltage
for
internal
references and sets the output common mode
voltage to VDD/2. Adding a capacitor to this pin filters
any noise into this pin and increases the kSVR.
C(BYPASS)also determines the rise time of VO+ and VO-
when the device is taken out of shutdown. The larger
the capacitor, the slower the rise time. Although the
The value of CI is important to consider as it directly
output rise time depends on the bypass capacitor
affects the bass (low frequency) performance of the
value, the device passes audio 4
s after taken out of
circuit. Consider the example where RI is 10 k and
shutdown and the gain is slowly ramped up based on
the specification calls for a flat bass response down
C(BYPASS).
to 100 Hz. Equation 2 is reconfigured as Equation 3.
To minimize pops and clicks, design the circuit so the
impedance (resistance and capacitance) detected by
both inputs, IN+ and IN-, is equal.
In this example, CI is 0.16 F, so one would likely
choose a value in the range of 0.22
F to 0.47 F. A
further consideration for this capacitor is the leakage
path from the input source through the input network
Copyright 2006–2008, Texas Instruments Incorporated
11
Product Folder Link(s): TPA6205A1
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPA6205A1DGNR 功能描述:音頻放大器 1.25W Mono Fully Diff ClassAB Aud Amp 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
TPA6205A1DGNRG4 功能描述:音頻放大器 1.25W Mono Fully Diff ClassAB Aud Amp 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
TPA6205A1DRB 制造商:TI 制造商全稱:Texas Instruments 功能描述:1.25-W MONO FULLY DIFFERENTIAL AUDIO POWER AMPLIFIER WITH 1.8-V INPUT LOGIC THRESHOLDS
TPA6205A1DRBR 功能描述:音頻放大器 1.25W Mono Fully Diff ClassAB Aud Amp 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
TPA6205A1DRBRG4 功能描述:音頻放大器 1.25W Mono Fully Diff ClassAB Aud Amp 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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