Application Information; Printed-Circuit Board (Pcb); Layout And Grounding - Philips TDA8946J Specification Sheet

Philips Semiconductors

14. Application information

Symmetrical
input
Asymmetrical
input
MICROCONTROLLER
MODE C1 C2
Standby 0 0
Mute 0 1
On 1 0
Fig 14. Application diagram.

14.1 Printed-circuit board (PCB)

14.1.1 Layout and grounding

9397 750 06863
Product specification
220 nF
IN1 8
R s
C i
1.5
nF
220 nF
220 nF
R s
6
IN1
C i
IN2
9
220 nF
signal
GND
1.5
nF
V CC
12
IN2
R
MODE
10
R
C1
SVR
11
signal
GND
C2
10
F
For a high system performance level 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.
Rev. 02 — 14 March 2000
2 x 15 W stereo BTL audio amplifier
3
16
R i
45 k
1/2 V CC
1/2 V CC
R i
45 k
TDA8946J
R i
45 k
1/2 V CC
1/2 V CC
R i
45 k
V CC
STANDBY/
MUTE LOGIC
20 k
SHORT CIRCUIT
1/2 V CC
TEMPERATURE
PROTECTION
20 k
2
TDA8946J
100 nF 1000 F
30 k
1 OUT1
R L
8
4 OUT1
30 k
14
OUT2
R L
8
17 OUT2
30 k
AND
15
GND
MGU014
© Philips Electronics N.V. 2000. All rights reserved.
V CC
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