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TEA6886

Up-level Car radio Analog Signal Processor (CASP)

Philips Electronics 

Philips Semiconductors

Up-level Car radio Analog Signal

Processor (CASP)

Product specification

TEA6886HL

7.5.2 LOUDNESS

The output of the source selector is fed into the loudness

circuit via the external capacitor CKVL (between pins LOPO

and LOPI) and CKVR (between pins ROPO and ROPI).

Depending on the external circuits for the left and the right

channel, only a bass boost or bass and treble boost is

available. The external circuits illustrated in Figs 13 and 15

will produce the curves illustrated in Figs 14 and 16

(without the influence of CKVL and CKVR respectively).

7.5.3 VOLUME 1

The volume 1 control circuit follows the loudness circuit.

The control range of volume 1 is between +20 and −36 dB

in steps of 1 dB.

7.5.4 TREBLE

The output signal of the volume 1 control circuit is fed into

the treble control stage. The control range is between

+14 and −14 dB in steps of 2 dB. Fig.20 shows the control

characteristic with external capacitors of 10 nF.

7.5.5 BASS

The bass control is the next stage. The characteristic of the

bass curves depends upon the external circuits connected

to pins LBO and LBI (left channel) and pins RBO and RBI

(right channel) and also upon the setting of bit BSYM (MSB

of the bass control byte). When BSYM = 1, an equalizer

characteristic is obtained and when BSYM = 0, a shelving

characteristic is obtained.

Figures 17 and 18 show the bass curves with an external

circuit of 2 × 220 nF capacitors and a resistor of 3.3 kΩ for

each channel with different values for BSYM. Figure 19

shows the bass curves with an external capacitor of 47 nF

for each channel and BSYM = 0, for boost and cut.

7.5.6 VOLUME 2

The four volume 2 blocks are located at the end of the

tone/volume control. In addition to volume control (same

settings as volume 2) the balance and fader functions are

also performed by individual attenuation offsets for the four

attenuators. The control range of these attenuators is

56 dB in steps of 1 dB and the additional steps of

−58.5 dB, −62 dB, −68 dB, and a mute step.

7.5.7 RSA SELECTOR

The RSA selector provides the possibility to select an

alternative source for the rear channels. In this event rear

channels are only controlled by the volume 2 function.

7.5.8 CHIME ADDER

The chime adder circuit enables the chime input signal to

be summed with the left front and/or right front audio, or be

turned off.

2000 Nov 21

12

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