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參數(shù)資料
| 型號： | TPA3107D2PAPTG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 15 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP64 |
| 封裝： | 10 X 10 MM, GREEN, PLASTIC, HTQFP-64 |
| 文件頁數(shù)： | 9/32頁 |
| 文件大小： | 1027K |
| 代理商： | TPA3107D2PAPTG4 |
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Adaptive Dynamic Range Control
TPA3107D2
t-Time=100 s/div
m
V-V
oltage=10V/div
ClosestCompetitor
t-Time=20 s/div
m
V-V
oltage=1V/div
TPA3107D2
Gain setting via GAIN0 and GAIN1 inputs
INPUT RESISTANCE
SLOS509B – OCTOBER 2006 – REVISED JULY 2007
APPLICATION INFORMATION (continued)
Figure 25. 1-kHz Sine Output at 10% THD+N
Figure 26. 8-kHz Sine Output at 10% THD+N
The Texas Instruments patent-pending adaptive dynamic range control (ADRC) technology removes the notch
inherent in class-D audio power amplifiers when they come out of clipping. This effect is more severe at higher
frequencies as shown in Figure 26.
The gain of the TPA3107D2 is set by two input terminals, GAIN0 and GAIN1.
The gains listed in Table 1 are realized by changing the taps on the input resistors and feedback 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 from part-to-part at the same gain 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 12.8 k
, which is the absolute minimum input impedance of the TPA3107D2. At the lower gain
settings, the input impedance could increase as high as 38.4 k
Table 1. Gain Setting
INPUT IMPEDANCE
AMPLIFIER GAIN (dB)
(k
)
GAIN1
GAIN0
TYP
0
20
32
0
1
26
16
1
0
32
16
1
36
16
Changing the gain setting can vary the input resistance of the amplifier from its smallest value, 16 k
±20%, to
the largest value, 32 k
±20%. As a result, if a single capacitor is used in the input high-pass filter, the -3 dB or
cutoff frequency may change when changing gain steps.
17
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