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參數(shù)資料
| 型號： | TPA0312PWPR |
| 元件分類： | 音頻放大器 |
| 英文描述： | SWITCH, DPDT, R/A, PCB, ON-OFF-ON; Switch function type:On-Off-On; Material, contact:Copper Alloy; Temp, op. max:85(degree C); Temp, op. min:-30(degree C); Length / Height, external:9.14mm; Width, external:8.13mm; Depth, RoHS Compliant: Yes |
| 中文描述： | 音頻放大器|雙|的CMOS | TSSOP封裝| 24針|塑料 |
| 文件頁數(shù)： | 19/31頁 |
| 文件大小： | 445K |
| 代理商： | TPA0312PWPR |
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TPA0312
2-W STEREO AUDIO POWER AMPLIFIER
WITH FOUR SELECTABLE GAIN SETTINGS AND MUX CONTROL
SLOS335 –DECEMBER 2000
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
gain setting via GAIN0 and GAIN1 inputs
The gain of the TPA0312 is set by two input terminals, GAIN0 and GAIN1.
Table 1. Gain Settings
GAIN0
GAIN1
SE/BTL
AV(inv)
6 dB
0
0
0
0
1
0
10 dB
1
0
0
15.6 dB
1
1
0
21.6 dB
X
X
1
4.1 dB
The gains listed in Table 1 are realized by changing the taps on the input resistors inside the amplifier. This
causes the input impedance, Z
I
, 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 will shift 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 TPA0312. At the higher gain
settings, the input impedance could increase as high as 115 k
.
input resistance
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 cut off frequency will also change by over 6 times. If an additional resistor is connected from the input pin of
the amplifier to ground, as shown in the figure below, the variation of the cut-off frequency will be much reduced.
C
R
IN
ZI
ZF
Input
Signal
The typical input impedance at each gain setting is given in the table below:
Av(inv)
21.6 dB
ZI
25 k
45 k
70 k
90 k
15.6 dB
10 dB
6 dB
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| TPA0312PWPRG4 | 功能描述:音頻放大器 St 2W Aud Pwr 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 |
| TPA032D01 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-W MONO CLASS-D AUDIO POWER AMPLIFIER |
| TPA032D01_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-W MONO CLASS-D AUDIO POWER AMPLIFIER |
| TPA032D01DCA | 功能描述:音頻放大器 10W Monaur 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 |
| TPA032D01DCA | 制造商:Texas Instruments 功能描述:IC SM POWER AMP CLASS-D AUDIO |
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