參數(shù)資料
型號(hào)： TPA0132PWPRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻控制
英文描述： 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24
封裝： GREEN, PLASTIC, HTSSOP-24
文件頁(yè)數(shù)： 9/33頁(yè)
文件大?。?/td> 788K
代理商： TPA0132PWPRG4
www.ti.com
VOLUME CONTROL OPERATION
Decreasing Voltage on
VOLUME Terminal
Increasing Voltage on
VOLUME Terminal
1.17
1.36
1.25
1.29
-2
0
2
Gain
-
dB
Voltage on VOLUME Pin - V
INPUT RESISTANCE
C
R
IN
Ri
Rf
Input Signal
TPA0132
SLOS223E – MAY 1999 – REVISED SEPTEMBER 2004
APPLICATION INFORMATION (continued)
The VOLUME pin controls the volume of the TPA0132. It is controlled with a dc voltage, which should not exceed
VDD. The gain voltages on the VOLUME pin are given in the Typical Characteristics section.
The trip point, where the gain actually changes, is different depending on whether the voltage on the VOLUME
terminal is increasing or decreasing as a result of hysteresis about each trip point. The hysteresis ensures that
the gain control is monotonic and does not oscillate from one gain step to another. A pictorial representation of
the volume control can be found in Figure 32. The graph focuses on three gain steps with the trip points defined
in the first and second columns of the Typical DC Volume Control table. The dotted lines represent the hysteresis
about each gain step.
DC Volume Control Operation
Figure 32.
The gain is set by varying the input resistance of the amplifier, which can range from its smallest value to over
six times that value. As a result, if a single capacitor is used in the input high pass filter, the –3 dB or cut-off
frequency also changes by over six times. Connecting an additional resistor from the input pin of the amplifier to
ground, as shown in Figure 33, reduces the cutoff-frequency variation.
Figure 33. Resistor on Input for Cut-Off Frequency
The input resistance at each gain setting is given in the graph for Input Impedance vs Gain in the Typical
Characteristics section.
The –3-dB frequency can be calculated using Equation 1.
17
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPA0142 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W STEREO AUDIO POWER AMPLIFIER WITH DC VOLUME CONTROL
TPA0142EVM 功能描述:音頻 IC 開發(fā)工具 TPA0142 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V
TPA0142PWP 功能描述:音頻放大器 2W Stereo A 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
TPA0142PWPG4 功能描述:音頻放大器 2W Stereo APA With DC Volume Control 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
TPA0142PWPR 功能描述:音頻放大器 2W Stereo APA With DC Volume Control 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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