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參數(shù)資料
| 型號： | TPA2000D1TPWRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO16 |
| 封裝： | GREEN, PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 4/19頁 |
| 文件大?。?/td> | 307K |
| 代理商： | TPA2000D1TPWRQ1 |
Input Resistance
Ci
IN
Zi
Zf
Input
Signal
f
*3 dB +
1
2p C
i Z i
(4)
Input Capacitor, CI
fc +
1
2 p Z
i
C
i
3 dB
fc
(5)
SGLS137E – SEPTEMBER 2002 – REVISED OCTOBER 2008 ........................................................................................................................................ www.ti.com
Table 2. Gain Settings
AMPLIFIER GAIN
INPUT IMPEDANCE
(dB)
(k
)
GAIN1
GAIN0
TYP
0
6
104
0
1
12
74
1
0
18
44
1
23.5
24
Each gain setting is achieved 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 cutoff frequency also changes by over six times.
The –3-dB frequency can be calculated using Equation 4.
In the typical application, an input capacitor (CI) is required to allow the amplifier to bias the input signal to the
proper dc level for optimum operation. In this case, CI and the input impedance of the amplifier (ZI) form a
high-pass filter with the corner frequency determined in Equation 5.
12
Copyright 2002–2008, Texas Instruments Incorporated
Product Folder Link(s): TPA2000D1-Q1
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