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參數(shù)資料
| 型號： | TPA0222PWP |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 音頻放大器 |
| 英文描述： | STEREO 2-W AUDIO POWER AMPLIFIER WITH FOUR SELECTABLE GAIN SETTINGS AND MUX CONTROL |
| 中文描述： | 立體聲2 - W音頻功率放大器，具有四種可選增益設(shè)置和MUX控制 |
| 文件頁數(shù)： | 21/33頁 |
| 文件大?。?/td> | 522K |
| 代理商： | TPA0222PWP |
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TPA0222
STEREO 2-W AUDIO POWER AMPLIFIER
WITH FOUR SELECTABLE GAIN SETTINGS AND MUX CONTROL
SLOS285 – NOVEMBER 1999
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
gain setting via GAIN0 and GAIN1 inputs
The gain of the TPA0222 is set by two input terminals, GAIN0 and GAIN1.
Table 1. Gain Settings
GAIN0
0
0
1
1
X
GAIN1
0
1
0
1
X
SE/BTL
0
0
0
0
1
A
V
–2 V/V
–6 V/V
–12 V/V
–24 V/V
–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, 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 TPA0222. 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 resistance at each gain setting is given in the table below:
A
v
Z
I
–24 V/V
–12 V/V
–6 V/V
–2 V/V
14 k
26 k
45.5 k
91 k
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| TPA0222PWPG4 | 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 |
| TPA0222PWPR | 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 |
| TPA0222PWPRG4 | 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 |
| TPA0223 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W MONO AUDIO POWER AMPLIFIER WITH HEADPHONE DRIVE |
| TPA0223DGQ | 功能描述:音頻放大器 2W Mono 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 |
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