1996 Jul 29

9

Philips Semiconductors

Preliminary specification

Ground noise isolation amplifier

TDA8575

APPLICATION INFORMATION

General

The TDA8575(T) is a two channel amplifier with differential

input and single-ended output for use in car audio

applications. The differential amplifier has a gain of 0 dB,

a low distortion and a high common mode rejection.

Due to wiring resistance and noise coming from various

electric devices in the automobile, performance loss will

appear in those car audio applications where long

connections between signal sources and amplifiers (or

boosters) are necessary. To solve these problems the

TDA8575(T) is developed (see Figs 7 and 8).

Fig.7 A typical noise problem in car audio systems.

handbook, full pagewidth

Vno+Vi

Vno

Vi

in

MGE833

long cable

speaker

power

amplifier

car body noise

car body

car body

tuner

tape

CD

VCC

Vbat

Fig.8 The TDA8575(T) eliminates noise problems in car audio systems.

handbook, full pagewidth

Vno+Vi

Vno

Vno

Vi

in

MGE834

long cables

Vi+Vno / CMRR

speaker

power

amplifier

car body noise

ground noise isolation amplifier

car body

car body

+

−

tuner

tape

CD

VCC

VCC

Vbat