TEA6880 データシートの表示（PDF） - Philips Electronics

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TEA6880

Up-level Car radio Analog Signal Processor CASP

Philips Electronics 

Philips Semiconductors

Up-level Car radio Analog Signal

Processor (CASP)

Product specification

TEA6880H

For the time of fast RDS updating soft mute, SNC and

HCC can be put on hold and the AM wideband peak

detector and the ultrasonic noise peak detector are put on

reset by a switch signal delivered from the TEA6840H via

pin 51 (FMHOLD).

The six separate detecting circuits are:

1. The AM wideband noise peak detector is driven from

a 20 kHz band-pass filter connected to the level buffer

output. The time constant is defined by an external

capacitor at pin 45 (TWBAM2). The output voltage of

the detector is analog-to-digital converted by 3-bit.

2. The AM wideband noise average detector is driven

from a 20 kHz band-pass filter connected to the level

buffer output. The time constant is defined by an

external capacitor at pin 63 (TWBAM1). The output of

the detector is connected to the Stereo Noise Control

(SNC) circuit.

3. The ultrasonic noise peak detector is driven from a

60 kHz high-pass filter connected to the MPX signal

from pin 55 (MPXRDS). The time constant is defined

by an external capacitor at pin 46 (TUSN2). The output

voltage of the detector is analog-to-digital converted

by 3-bit.

4. The ultrasonic noise average detector is driven from a

60 kHz high-pass filter connected to the MPX signal

from pin 55 (MPXRDS). The time constant is defined

by an external capacitor at pin 64 (TUSN1). The output

of the detector is connected to soft mute control and

stereo noise control circuits.

5. For soft mute and high cut control purposes an

average detector with externally defined time constant

(TMUTE, pin 54) is provided. The detector is driven by

level output only. Soft mute as well as high cut control

can be switched off by the I2C-bus.

6. The stereo noise control peak detector with externally

defined time constant (TSNC, pin 56) is driven by

DC level output, AM wideband and ultrasonic noise

outputs. It provides the stereo blend facility (SNC).

Starting point and slope of stereo blend can be chosen

by the I2C-bus controlled reference voltage.

7.5 Tone/volume control

The tone/volume control part consists of the following

functions:

• Source selector

• Loudness

• Volume 1

• Treble

• Bass

• Volume 2

• Rear Seat Audio (RSA) selector

• Chime adder

• Analog step interpolation

• Audio blend control.

The stages loudness, volume 1, bass, and volume 2

include the Analog Step Interpolation (ASI) function. This

minimizes pops by smoothing out the transitions in the

audio signal during switching. The transition time is

I2C-bus programmable in a range of 1 : 24 in four steps.

The stages loudness, volume 1, and volume 2 also have

the Audio Blend Control (ABC) function. This minimizes

pops by automatically incrementing the volume and

loudness controls through each step between their present

settings and the new settings. The speed of the ABC

function is correlated with the transition time of the ASI

function.

All stages are controlled via the I2C-bus.

2000 May 08

11

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