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TPA2001D2 Scheda tecnica(PDF) 8 Page - Texas Instruments |
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TPA2001D2 Scheda tecnica(HTML) 8 Page - Texas Instruments |
8 / 13 page TPA2001D2 1-W FILTERLESS STEREO CLASS-D AUDIO POWER AMPLIFIER SLOS292A – MARCH 2000 – REVISED APRIL 2000 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION Table 2. Gain Settings GAIN0 GAIN1 AMPLIFIER GAIN (dB) INPUT IMPEDANCE (k Ω) GAIN0 GAIN1 TYP TYP 0 0 8 104 0 1 12 74 1 0 17.5 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 6 times that value. As a result, if a single capacitor is used in the input high pass filter, the –3 dB or cut-off frequency will also change by over 6 times. If an additional resistor is connected from the input pin of the amplifier to ground, as shown in the figure below, the variation of the cut-off frequency will be much reduced. Ci R IN ZI ZF Input Signal The –3 dB frequency can be calculated using equation 4: (4) f –3 dB + 1 2 p C i R ø ZI If the filter must be more accurate, the value of the capacitor should be increased while value of the resistor to ground should be decreased. In addition, the order of the filter could be increased. input capacitor, Ci 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 5. f c(highpass) + 1 2 pZ I C i –3 dB fc (5) |
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