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参数资料
| 型号： | TPA0242PWPG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24 |
| 封装： | GREEN, PLASTIC, HTSSOP-24 |
| 文件页数： | 10/35页 |
| 文件大小： | 806K |
| 代理商： | TPA0242PWPG4 |
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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
TPA0242
SLOS287C – NOVEMBER 1999 – REVISED SEPTEMBER 2004
APPLICATION INFORMATION (continued)
The VOLUME pin controls the volume of the TPA0242. 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 33. 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.
Figure 33. DC Volume Control Operation
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 34, reduces the cutoff-frequency variation.
Figure 34. 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.
18
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相关代理商/技术参数 |
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|---|---|
| TPA0242PWPR | 功能描述:音频放大器 St 2W Aud Pwr Amp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA0242PWPRG4 | 功能描述:音频放大器 St 2W Aud Pwr Amp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA0243 | 制造商:TI 制造商全称:Texas Instruments 功能描述:2-W MONO AUDIO POWER AMPLIFIER WITH HEADPHONE DRIVE |
| TPA0243DGQ | 功能描述:音频放大器 2W Mono Aud Pwr Amp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA0243DGQG4 | 功能描述:音频放大器 2W Mono Aud Pwr Amp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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