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TDA8947J Datasheet(Fiches technique) 17 Page - NXP Semiconductors

Numéro de pièce TDA8947J
Description  4-channel audio amplifier (SE: 1 W to 25 W; BTL: 4 W to 50 W)
Télécharger  24 Pages
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
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 17 page
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Philips Semiconductors
TDA8947J
4-channel audio amplifier
Preliminary data
Rev. 01 — 06 February 2004
17 of 24
9397 750 10779
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
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.
13.2.2
Power supply decoupling
Proper supply bypassing is critical for low-noise performance and high supply voltage
ripple rejection. The respective capacitor location should be as close as possible to
the device and grounded to the power ground. Proper power supply decoupling also
prevents oscillations.
For suppressing higher frequency transients (spikes) on the supply line a capacitor
with low ESR, typical 100 nF, has to be placed as close as possible to the device. For
suppressing lower frequency noise and ripple signals, a large electrolytic capacitor,
e.g. 1000
µF or greater, must be placed close to the device.
The bypass capacitor on pin SVR reduces the noise and ripple on the mid rail
voltage. For good THD and noise performance a low ESR capacitor is recommended.
Fig 14. Printed-circuit board layout (single-sided); components view.
MCE483
AUDIO POWER CS NIJMEGEN
4.7 nF
220 nF
220 nF
220 nF
220 nF
220 nF
100 nF
27J
an.2003
/FP
4
4
4
4
4
4
10 k
10 k
150
µF
22
µF
220
µF
+ Vp
IN2
+
IN1
+
IN3
+
IN4
+
VOL.Sgnd
MUTE
MODE1
SB ON
OFF
CIV
TVA
SVF
1
1
ON




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