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TPA2000D1-Q1 Datasheet(PDF) 11 Page - Texas Instruments

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Part No. TPA2000D1-Q1
Description  2-W FILTERLESS MONO CLASS-D AUDIO POWER AMPLIFIER
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

TPA2000D1-Q1 Datasheet(HTML) 11 Page - Texas Instruments

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TPA2000D1Q1
2W FILTERLESS MONO CLASSD AUDIO POWER AMPLIFIER
SGLS137B− SEPTEMBER 2002 − REVISED SEPTEMBER 2004
11
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
C2
C1
L1
L2
OUT−
OUT+
Figure 11. Class-D Output Filter
gain setting via GAIN0 and GAIN1 inputs
The gain of the TPA2000D1 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 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 actual gain distribution from part-to-part is quite good. However, the input
impedance may shift by 30% 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 20 k
Ω, which is the absolute minimum input impedance of the TPA2000D1. At the higher gain
settings, the input impedance could increase as high as 115 k
Ω.
Table 2. Gain Settings
GAIN0
GAIN1
AMPLIFIER GAIN
(dB)
INPUT IMPEDANCE
(k
Ω)
GAIN0
GAIN1
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 also changes by over six times.
Ci
IN
Zi
Zf
Input
Signal


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