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AN10327 Datasheet(PDF) 4 Page - NXP Semiconductors |
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AN10327 Datasheet(HTML) 4 Page - NXP Semiconductors |
4 / 19 page Philips Semiconductors AN10327 TDA856x ,TDA8571J 2. Application Information 2.1 Input capacitors The amplifiers need capacitors on the inputs to get a DC decoupling of the input source (pre-amplifier stage). The impedance of the input stage together with the input capacitors, create a low frequency roll-off point. A larger input capacitor means a lower frequency roll-off point. The values that should be used are mentioned in the datasheet of the amplifier type. The following figure shows the influence of the input capacitors on the frequency roll-off point for the TDA8566TH. (A) Input capacitor 470nF (B) Input capacitor 220nF (C) Input capacitor 100nF Fig 1. Roll-off frequency at different input capacitor values The low frequency roll-off point can easily be calculated : tot in in dB low C Z f _ 3 _ 2 1 ⋅ ⋅ ⋅ = − π <12NC> © Koninklijke Philips Electronics N.V. 2004. All rights reserved. Application note Rev. 01.00 — 15 October 2004 4 of 19 |
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