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TFA9842AJ Datasheet(PDF) 11 Page - NXP Semiconductors |
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TFA9842AJ Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 18 page TFA9842AJ_1 © Koninklijke Philips Electronics N.V. 2006. All rights reserved. Preliminary specification Rev. 01 — 28 April 2006 11 of 18 Philips Semiconductors TFA9842AJ 7.5 W stereo power amplifier with volume control 13.1.2 Volume control drive options 13.2 Printed-circuit board 13.2.1 Layout and grounding To obtain a high-level system performance, certain grounding techniques are essential. The input reference grounds have to be tied with their respective source grounds and must have separate tracks from the power ground tracks; this will prevent the large output signal currents from interfering with the small AC input signals. The small-signal ground tracks should be physically located as far as possible from the power ground tracks. Supply and output tracks should be as wide as possible for delivering maximum output power. Fig 12. Volume control drive circuit with 3.3 V PWM Fig 13. Volume control drive circuit with 5 V PWM Fig 14. Volume control drive circuit with potentiometer 001aae337 1 k Ω R5 1 k Ω R4 R2 1 k Ω R1 10 k Ω D1 5.6 V R3 1 k Ω T3 T1 T2 C1 10 µF PWM 3.3 V VC VCC GND 5 V 001aae338 1 k Ω R4 C1 10 µF PWM 5 V VC 001aae339 16 k Ω R5 R6 16 k Ω R1 10 k Ω D1 10 V T1 C1 10 µF VC VCC |
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