參數(shù)資料
型號(hào): TPA2000D1GQC
廠商: Texas Instruments, Inc.
英文描述: 2-W FILTERLESS MONO CLASS-D AUDIO POWER AMPLIFIER
中文描述: 2 - W型單聲道無濾波器D類音頻功率放大器
文件頁數(shù): 8/14頁
文件大?。?/td> 205K
代理商: TPA2000D1GQC
TPA2000D1
2-W FILTERLESS MONO CLASS-D AUDIO POWER AMPLIFIER
SLOS328B
JUNE 2000
REVISED MAY 2001
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Table 1. Gain Settings
GAIN0
GAIN1
AMPLIFIER GAIN
(dB)
INPUT IMPEDANCE
(k
)
TYP
TYP
0
0
6
104
0
1
12
74
1
0
18
44
1
1
23.5
24
input resistance
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 will also change by over six times.
Ci
IN
Zi
Zf
Input
Signal
The
3-dB frequency can be calculated using equation 4.
(4)
f
3 dB
1
2
C
i
R Z
i
input capacitor, C
i
In the typical application an input capacitor (C
i
) is required to allow the amplifier to bias the input signal to the
proper dc level for optimum operation. In this case, C
i
and the input impedance of the amplifier (Z
i
) form a
high-pass filter with the corner frequency determined in equation 5.
f
c
1
2 Z
i
C
i
3 dB
fc
(5)
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