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TPA2001D1 Arkusz danych(PDF) 8 Page - Texas Instruments |
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TPA2001D1 Arkusz danych(HTML) 8 Page - Texas Instruments |
8 / 15 page TPA2001D1 1-W FILTERLESS MONO CLASS-D AUDIO POWER AMPLIFIER SLOS338D – SEPTEMBER 2000 – REVISED DECEMBER 2002 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION Table 1. Gain Settings GAIN1 GAIN0 AMPLIFIER GAIN (dB) INPUT IMPEDANCE (k Ω) GAIN1 GAIN0 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 –3dB or cutoff frequency also changes by over six times. Ci IN ZI ZF Input Signal The –3 dB frequency can be calculated using equation 4. (4) fc + 1 2 p Z I C i 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. fc + 1 2 pZ I C i –3 dB fc (5) |
Podobny numer części - TPA2001D1_06 |
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Podobny opis - TPA2001D1_06 |
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