TDA8562 datasheet(4/16 Pages) PHILIPS

4 / 16 page

July 1994

Philips Semiconductors

Product speciﬁcation

4 x 12 W single-ended car radio power ampliﬁer with

dynamic distortion detector and diagnostic interface

TDA8562Q

PINNING

The device is primarily developed for car radio

applications.

SYMBOL

DESCRIPTION

IN 1

input 1

GND(S)

signal ground

IN 2

input 2

supply voltage ripple rejection

VP1

supply voltage

OUT 1

output 1

GND1

power ground 1

OUT 2

output 2

n.c.

not connected

OUT 3

output 3

GND2

power ground 2

OUT 4

output 4

VP2

supply voltage

MODE

mode select switch input

IN 3

input 3

VDIAG

diagnostic output

IN 4

input 4

handbook, halfpage

TDA8562Q

IN 1

GND(S)

IN 2

OUT 1

GND1

OUTP 2

n.c.

OUT 3

GND2

OUTP 4

MODE

IN 3

DIAG

IN 4

V P1

MEA866 - 1

Fig.2 Pin configuration.

FUNCTIONAL DESCRIPTION

The TDA8562Q contains four identical amplifiers and can

be used for single-ended applications. The gain of each

amplifier is fixed at 20 dB. Special features of the device

are:

Mode select switch (pin 14)

• low stand-by current (< 100 µA)

• low switching current (low cost supply switch)

• mute facility

To avoid switch-on plops, it is advised to keep the amplifier

in the mute mode during

≥ 100 ms (charging of the input

capacitors at pin 1, 3, 15 and pin 17).

This can be achieved by:

• microprocessor control

• external timing circuit (see Fig.7)

Diagnostic output (pin 16)

DYNAMIC DISTORTION DETECTOR

(DDD)

At the onset of clipping of one or more output stages, the

dynamic distortion detector becomes active and pin 16

goes low. This information can be used to drive a sound

processor or DC volume control to attenuate the input

signal and thus limit the distortion. The output level of pin

16 is independent of the number of channels that are

clipping (see Fig.3).

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