January 1992

5

Philips Semiconductors

Preliminary specification

Sound fader control circuit

for car radios

TEA6330T

FUNCTIONAL DESCRIPTION

controller for car radios including fader function and the

possibility of an external equalizer. The sound signal

setting is performed by resistor chains in combination with

multi-input operational amplifiers. The advantages of this

principle are the combination of low noise, low distortion

and a high dynamic range. The separated volume controls

of the left and the right channel make the balance control

possible. The value and the characteristic of the balance is

The contour function is performed by setting an extra bass

control and optional treble, depending on the actual

volume position. Its switching points and its range are also

An interface is assigned behind the volume control to

loop-in an equalizer (Fig.2). In this case the treble control

is switched off, and the bass control can be used to set the

contour.

Low level control fader is included independent of the

volume controls, because the TEA6330T has four driver

outputs (for front and rear).

An extra mute position for the front, the rear or for all

channels is built in. The last function may be used for

muting during preset selection. No external interface is

required between the microcomputer and this circuit, for all

switching and controlling functions are controllable via the

The separate mute-pin allows to switch the fader into mute

The on chip power-on reset sets the TEA6330T into the

general mute mode.

LIMITING VALUES

In accordance with the Absolute Maximum System (IEC 134). Ground pins 3 and 10 connected together.

* Equivalent to discharging a 200 pF capacitor through a 0

Ω series resistor.

** Equivalent to discharging a 100 pF capacitor through a 1.5 k

Ω series resistor.

SYMBOL

PARAMETER

MIN.

MAX.

UNIT

supply voltage (pin 18)

0

10

V

total power dissipation

0

700

mW

storage temperature range

−55

150

°C

operating ambient temperature range

−40

85

°C

electrostatic handling* for all pins

−±300

V

electrostatic handling** for all pins

−±4000

V