參數(shù)資料
型號(hào)： TPA0252PWP
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(yè)數(shù)： 10/34頁(yè)
文件大?。?/td> 851K
代理商： TPA0252PWP
www.ti.com
C
R
IN
Ri
Rf
Input Signal
–3 dB +
1
2p C R
Ri
(2)
Input Capacitor, C
i
f
c(highpass) +
1
2 p Z
i
C
i
-3 dB
fc
(3)
C
i
+
1
2p Z
i
fc
(4)
TPA0252
SLOS288B – JUNE 2000 – REVISED SEPTEMBER 2004
Figure 35. Resistor on Input for Cut-Off Frequency
The input resistance at each gain setting is given in the graph for Input Impedance vs Gain in the Typical
Characteristics section.
The –3-dB frequency can be calculated using Equation 2.
To increase filter accuracy, increase the value of the capacitor and decrease the value of the resistor to ground.
In addition, the order of the filter can be increased.
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 3.
The value of Ci is important to consider as it directly affects the bass (low frequency) performance of the circuit.
Consider the example where Zi is 15 k (from Figure 28) and the specification calls for a flat bass response
down to 40 Hz. Equation 3 is reconfigured as Equation 4.
In this example, Ci is 0.27 F, so one would likely choose a value in the range of 0.27 F to 1 F. 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 in high gain applications. For this reason a low-leakage tantalum or ceramic
capacitor is the best choice. When polarized capacitors are used, the positive side of the capacitor faces the
amplifier input in most applications as the dc level there is held at VDD/2, which is likely higher than the source dc
level. Note that it is important to confirm the capacitor polarity in the application.
18
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