TDA8575 Datasheet, PDF (9/16 Pages) NXP Semiconductors – Ground noise isolation amplifier

Philips Semiconductors
Ground noise isolation amplifier
Preliminary specification
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).
handbook, full pagewidth
VCC
in ^Vi
tuner
tape
CD
Vno+Vi
Vno
Vbat
speaker
long cable
power
amplifier
car body
car body noise
car body _MGE833
Fig.7 A typical noise problem in car audio systems.
handbook, full pagewidth
VCC
Vi
in
tuner
tape
CD
ground noise isolation amplifier
VCC
Vno+Vi
long cables
Vno
+
Vi+Vno / CMRR
−
Vno
Vbat
speaker
power
amplifier
car body
car body noise
car body MGE834
Fig.8 The TDA8575(T) eliminates noise problems in car audio systems.
1996 Jul 29
9