參數(shù)資料
型號： TPA3125D2N
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 36 W, 2 CHANNEL, AUDIO AMPLIFIER, PDIP20
封裝： ROHS COMPLIANT, PLASTIC, DIP-20
文件頁數(shù)： 6/26頁
文件大小： 467K
代理商： TPA3125D2N
INPUT RESISTANCE
Ci
IN
Zi
Zf
Input
Signal
f=
1
2
Z C
p
i
(1)
INPUT CAPACITOR, Ci
f
=
c
1
2
Z C
p
i
–3dB
fc
(2)
C =
i
1
2
Z f
p
i
c
(3)
SLOS611 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com
Table 2. Gain Setting
INPUT IMPEDANCE
AMPLIFIER GAIN (dB),
GAIN1
GAIN0
(k
),
TYPICAL
0
20
60
0
1
26
30
1
0
32
15
1
36
9
Changing the gain setting can vary the input resistance of the amplifier from its smallest value, 9 k
±20%, to the
largest value, 60 k
±20%. As a result, if a single capacitor is used in the input high-pass filter, the –3-dB cutoff
frequency will change when changing gain steps.
The –3-dB frequency can be calculated using Equation 1. Use the ZI values given in Table 2.
In the typical application, 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 2.
The value of Ci is important, as it directly affects the bass (low-frequency) performance of the circuit. Consider
the example where (Zi is 60 k and the specification calls for a flat bass response down to 20 Hz. Equation 2 is
reconfigured as Equation 3.
In this example, Ci is 0.4 F; so, one would likely choose a value of 0.47 F as this value is commonly used. If
the gain is known and is constant, use Zi from Table 2 to calculate Ci. A further consideration for this capacitor is
the leakage path from the input source through the input network, Ci, and the feedback network to the load. This
leakage current creates a dc offset voltage at the input to the amplifier that reduces useful headroom, especially
14
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPA3125D2
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