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TPA2001D2PWPR データシート(PDF) 8 Page - Texas Instruments

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部品番号 TPA2001D2PWPR
部品情報  1-W FILTERLESS STEREO CLASS-D AUDIO POWER AMPLIFIER
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TPA2001D2PWPR データシート(HTML) 8 Page - Texas Instruments

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TPA2001D2
1-W FILTERLESS STEREO CLASS-D AUDIO POWER AMPLIFIER
SLOS292A – MARCH 2000 – REVISED APRIL 2000
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Table 2. Gain Settings
GAIN0
GAIN1
AMPLIFIER GAIN
(dB)
INPUT IMPEDANCE
(k
Ω)
GAIN0
GAIN1
TYP
TYP
0
0
8
104
0
1
12
74
1
0
17.5
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 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.
Ci
R
IN
ZI
ZF
Input
Signal
The –3 dB frequency can be calculated using equation 4:
(4)
f
–3 dB +
1
2
p C
i R ø ZI
If the filter must be more accurate, the value of the capacitor should be increased while value of the resistor to
ground should be decreased. In addition, the order of the filter could be increased.
input capacitor, Ci
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.
f
c(highpass) +
1
2
pZ
I
C
i
–3 dB
fc
(5)


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