TDA8942 查看數據表（PDF） - Philips Electronics

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TDA8942

2 x 1.5 W stereo Bridge Tied Load (BTL) audio amplifier

Philips Electronics 

Philips Semiconductors

14. Application information

TDA8942P

2 x 1.5 W stereo BTL audio amplifier

Rs

220 nF

Symmetrical

input

Ci

220 nF

Rs

220 nF

Asymmetrical

input

Ci

signal

GND

220 nF

IN1− 13

1.5

nF

3

IN1+

IN2− 12

1.5

nF

VCC

R

11

IN2+

MODE 4

C1

MICROCONTROLLER

C2

MODE

Standby

Mute

On

C1 C2

00

01

10

R

signal

GND

SVR 14

10

µF

100 nF

1

9

30 kΩ

+VCC

1000 µF

Ri

45 kΩ

1/2 VCC

Ri

45 kΩ

−

−+

+

−

+

1/2 VCC

+

−

TDA8942P

30 kΩ

15 OUT1−

2 OUT1+

RL

16 Ω

Ri

45 kΩ

1/2 VCC

Ri

45 kΩ

−

−+

+

−

+

1/2 VCC

+

−

STANDBY/

MUTE LOGIC

VCC

30 kΩ

7 OUT2−

10 OUT2+

20 kΩ

1/2 VCC

20 kΩ

SHORT CIRCUIT

AND

TEMPERATURE

PROTECTION

RL

16 Ω

16

8

GND

MGL999

Fig 14. Application diagram.

14.1 Printed-circuit board (PCB)

14.1.1 Layout and grounding

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.

9397 750 06862

Product specification

Rev. 02 — 14 March 2000

© Philips Electronics N.V. 2000. All rights reserved.

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