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參數資料
| 型號： | TPA3008D2PHPR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 10 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48 |
| 封裝： | GREEN, PLASTIC, HTQFP-48 |
| 文件頁數： | 8/31頁 |
| 文件大小： | 654K |
| 代理商： | TPA3008D2PHPR |
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1 nF
Ferrite
Chip Bead
OUTP
OUTN
Ferrite
Chip Bead
1 nF
Ci
IN
Zi
Zf
Input
Signal
f +
1
2p Z
iCi
SLOS435C – MAY 2004 – REVISED AUGUST 2010
www.ti.com
Figure 20. Typical Ferrite Chip Bead Filter (Chip bead example: Fair-Rite 2512067007Y3)
Gain setting via GAIN0 and GAIN1 inputs
The gain of the TPA3008D2 is set by two input terminals, GAIN0 and GAIN1.
The gains listed in Table 2 are realized by changing the taps on the input resistors inside the amplifier. This
causes the input impedance (Zi) to be dependent on the gain setting. The actual gain settings are controlled by
ratios of resistors, so the gain variation from part-to-part is small. However, the input impedance may shift by
20% due to shifts in the actual resistance of the input resistors.
For design purposes, the input network (discussed in the next section) should be designed assuming an input
impedance of 26 k
, which is the absolute minimum input impedance of the TPA3008D2. At the lower gain
settings, the input impedance could increase as high as 165 k
Table 2. Gain Setting
INPUT IMPEDANCE
AMPLIFIER GAIN (dB)
(k
)
GAIN1
GAIN0
TYP
0
15.3
137
0
1
21.2
88
1
0
27.2
52
1
31.8
33
INPUT RESISTANCE
Each gain setting is achieved by varying the input resistance of the amplifier that can range from its smallest
value, 33 k
, to the largest value, 137 k. As a result, if a single capacitor is used in the input high-pass filter,
the -3 dB or cutoff frequency changes when changing gain steps.
(5)
16
Copyright 2004–2010, Texas Instruments Incorporated
Product Folder Link(s): TPA3008D2
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相關代理商/技術參數 |
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| TPA3008D2PHPRG4 | 功能描述:音頻放大器 10-W Stereo Class-D RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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