TEA6880H/V2,518 Ver la hoja de datos (PDF) - NXP Semiconductors.

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TEA6880H/V2,518

Up-level Car radio Analog Signal Processor (CASP)

NXP Semiconductors. 

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 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 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 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 MPXRDS. The time constant is defined by an

external capacitor at pin 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 MPXRDS. The time constant is defined by an

external capacitor at pin 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) 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) 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.

2003 Feb 04

11

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