TEA6880 Philips Semiconductors, TEA6880 Datasheet - Page 11

• Manufacturer Part Number: TEA6880
• Description: Up-level Car radio Analog Signal Processor CASP
• Manufacturer: Philips Semiconductors

Philips Semiconductors
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
2. The AM wideband noise average detector is driven
3. The ultrasonic noise peak detector is driven from a
4. The ultrasonic noise average detector is driven from a
5. For soft mute and high cut control purposes an
6. The stereo noise control peak detector with externally
2000 May 08
Up-level Car radio Analog Signal
Processor (CASP)
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.
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.
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.
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.
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 I
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 I
2
C-bus controlled reference voltage.
2
C-bus.
11
7.5
The tone/volume control part consists of the following
functions:
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
I
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 I
2
C-bus programmable in a range of 1 : 24 in four steps.
Source selector
Loudness
Volume 1
Treble
Bass
Volume 2
Rear Seat Audio (RSA) selector
Chime adder
Analog step interpolation
Audio blend control.
Tone/volume control
2
C-bus.
Product specification
TEA6880H