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Número de pieza | TEA6880H | |
Descripción | Up-level Car radio Analog Signal Processor | |
Fabricantes | NXP Semiconductors | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de TEA6880H (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
No Preview Available ! INTEGRATED CIRCUITS
DATA SHEET
TEA6880H
Up-level Car radio Analog Signal
Processor (CASP)
Product specification
Supersedes data of 2000 May 08
2003 Feb 04
1 page Philips Semiconductors
Up-level Car radio Analog Signal
Processor (CASP)
Product specification
TEA6880H
5 BLOCK DIAGRAM
handbook, full pagewidth
fref
(75.4 kHz)
audio
from
processing hold
NICE 100 nF
(for RDS update) (AFSAMPLE)
10 nF
470 kΩ
68 kΩ
100 nF
6.8 nF
6.8 nF
100 100
nF kΩ
22
nF
AM
mono
input
33 nF 220 kΩ
52
AMNBIN
53
220 nF 54
10 nF
MPXRDS
55
10 µF
RIN 182 kΩ
220 nF 100 kΩ 82 kΩ
56
57
MPX
input
33 pF
10 nF 58
3.3 nF
3.3 nF
2.7 nF
2.7 nF
4.7 nF
4.7 nF
59
60
61
62
63
64
51 50 49 48 47
120 kHz
HIGH-PASS
AMPLIFIER
AGC
PULSE
SEPARATOR
trigger sensitivity
NOISE
&
INTERFERENCE
DETECTOR
FM
PULSE
FORMER
46
60 kHz
HIGH-PASS
&
USN
DETECTOR
sensitivity
STEREO
DECODER
PLL
19 kHz
pilot
ind.
38 kHz
INPUT BUFFER
&
80 kHz
LOW-PASS
sep.adj.
mute slope
mute start
V/I
CONVERTER
start/
slope
TEA6880H
MATRIX
&
SOFT-MUTE
38 kHz
SNC
FM BUFFER
&
FM NB-GATES
HCC
50/75 µs
DE-EMPHASIS
&
AM STEREO INPUT
de-emphasis
switch
STEREO
DECODER
OUTPUT
start/
slope
BUS
LEVEL
ADC
(6-BIT)
bus controls
I2C-BUS
&
CONTROL LOGIC
detector hold
detector reset
test
12 3 45 6
22 kΩ
22 kΩ
I2C-bus
to NICE
from AM/FM
level detector
I2C-bus
VDD(I2C-bus)
LEVEL
INPUT
BUFFER
20 kHz
BAND-PASS
&
AMWB
DETECTOR
sensitivity
45 44
AM
GATE
test
AVERAGE
DETECTOR
(MUTE/HCC)
43
A
B
PEAK
DETECTOR
(SNC)
detector
hold
PEAK
DETECTOR
(WBAM2)
PEAK
DETECTOR
(USN2)
AVERAGE
DETECTOR
(WBAM1)
C
D
detector
reset
E
detector
hold
AVERAGE
DETECTOR
(USN1)
7
10 nF
F
G
H
MHB427
Fig.1 Block diagram (continued in Fig.2).
2003 Feb 04
5
5 Page 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
11 Page |
Páginas | Total 30 Páginas | |
PDF Descargar | [ Datasheet TEA6880H.PDF ] |
Número de pieza | Descripción | Fabricantes |
TEA6880 | Up-level Car radio Analog Signal Processor CASP | NXP Semiconductors |
TEA6880H | Up-level Car radio Analog Signal Processor | NXP Semiconductors |
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