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參數(shù)資料
| 型號： | TPA0222PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24 |
| 封裝： | GREEN, PLASTIC, HTSSOP-24 |
| 文件頁數(shù)： | 13/37頁 |
| 文件大?。?/td> | 866K |
| 代理商： | TPA0222PWPRG4 |
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GAIN SETTING VIA GAIN0 and GAIN1 INPUTS
INPUT RESISTANCE
C
R
IN
Zi
Zf
Input
Signal
–3 dB +
1
2p C R
Ri
(1)
TPA0222
SLOS285B – NOVEMBER 1999 – REVISED NOVEMBER 2004
The gain of the TPA0222 is set by two input terminals, GAIN0 and GAIN1.
Table 1. Gain Settings
GAIN0
GAIN1
SE/BTL
AV
0
2 V/V
0
1
0
6 V/V
1
0
12 V/V
1
0
24 V/V
X
1
1 V/V
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 dependant 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
shifts by 30% due to shifts in the actual resistance of the input impedance.
For design purposes, the input network (discussed in the next section) should be designed assuming an input
impedance of 10 k
, which is the absolute minimum input impedance of the TPA0222. At the higher gain
settings, the input impedance could increase as high as 115 k
.
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
cutoff frequency also changes by over 6 times. If an additional resistor is connected from the input pin of the
amplifier to ground, as shown in the following figure, the variation of the cutoff frequency will be much reduced.
The typical input resistance at each gain setting is given in the following table:
Av
Zi
24 V/V
14 k
12 V/V
26 k
6 V/V
45.5 k
2 V/V
91 k
The –3 dB frequency can be calculated using Equation 1:
If the filter must be more accurate, the value of the capacitor should be increased while the value of the resistor
to ground should be decreased. In addition, the order of the filter could be increased.
20
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