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| 型号： | TPA0122PWPG4 |
| 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： | 13/33页 |
| 文件大小： | 688K |
| 代理商： | TPA0122PWPG4 |
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GAIN SETTING VIA GAIN0 AND GAIN1 INPUTS
INPUT RESISTANCE
C
R
IN
ZI
ZF
Input
Signal
f
–3 dB +
1
2p C R
RI
(1)
TPA0122
SLOS247C – JUNE 1999 – REVISED SEPTEMBER 2004
APPLICATION INFORMATION (continued)
The gain of the TPA0122 is set by two input terminals, GAIN0 and GAIN1.
Table 1. Gain Settings
GAIN0
GAIN1
SE/BTL
AV
0
2 V/V
0
1
0
6 V/V
1
0
12 V/V
1
0
24 V/V
X
1
1 V/V
The gains listed in Table 1 are realized by changing the taps on the input resistors inside the amplifier. This
causes the input impedance, ZI, to be dependant on the gain setting. The actual gain settings are controlled by
ratios of resistors, so the actual gain distribution from part-to-part is quite good. However, the input impedance
shifts by 30% due to shifts in the actual resistance of the input impedance.
For design purposes, the input network (discussed in the next section) should be designed assuming an input
impedance of 10 k
, which is the absolute minimum input impedance of the TPA0122. At the higher gain
settings, the input impedance could increase as high as 115 k
.
Each gain setting is achieved by varying the input resistance of the amplifier, which can range from its smallest
value to over 6 times that value. As a result, if a single capacitor is used in the input high-pass filter, the –3 dB or
cutoff frequency also changes by over 6 times. If an additional resistor is connected from the input pin of the
amplifier to ground, as shown in the following figure, the variation of the cutoff frequency is much reduced.
The input resistance at each gain setting is given in the following table:
AV
ZI
24 V/V
14 k
12 V/V
26 k
6 V/V
45.5 k
2 V/V
91 k
The –3-dB frequency can be calculated using Equation 1:
If the filter must be more accurate, the value of the capacitor should be increased while the value of the resistor
to ground should be decreased. In addition, the order of the filter could be increased.
20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPA0122PWPR | 功能描述:音频放大器 2W Stereo APA With Int Gain Settings 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 |
| TPA0122PWPRG4 | 功能描述:音频放大器 2W Stereo APA With Int Gain Settings 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 |
| TPA0132 | 制造商:TI 制造商全称:Texas Instruments 功能描述:2-W STEREO AUDIO POWER AMPLIFIER WITH DC VOLUME CONTROL |
| TPA0132EVM | 功能描述:音频 IC 开发工具 TPA0132 Eval Mod RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| TPA0132PWP | 功能描述:音频放大器 2W Stereo A 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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