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參數(shù)資料
| 型號： | TEA6886HL |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | Up-level Car radio Analog Signal Processor CASP |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封裝： | 12 X 12 MM, 1.40 MM HEIGHT, PLASTIC, SOT-315-1, LQFP-80 |
| 文件頁數(shù)： | 11/92頁 |
| 文件大小： | 376K |
| 代理商： | TEA6886HL |
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2000 Nov 21
11
Philips Semiconductors
Product specification
Up-level Car radio Analog Signal
Processor (CASP)
TEA6886HL
For the period of fast RDS updating soft mute, SNC and
HCC can be put on hold. The AM wideband peak detector
and the ultrasonic noise peak detector are reset by a
switch signal delivered from the TEA6840H via pin
FMHOLD.
The six separate detecting circuits are as follows:
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 connected to pin TWBAM2. The output
voltage of the detector is analog-to-digital converted
by a 3-bit ADC.
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 connected to 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 connected to pin TUSN2. The
output voltage of the detector is analog-to-digital
converted by a 3-bit ADC.
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 connected to 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 an externally defined time
constant (TMUTE) is provided. The detector is driven
by level output only. Soft mute and high cut control can
be switched off via the I
2
C-bus.
6.
The stereo noise control peak detector with an
externally defined time constant (TSNC) is driven by
DC level output, AM wideband and ultrasonic noise
outputs.Itprovidesthestereoblendfacility(SNC).The
starting point and slope of the stereo blend can be
chosen via the I
2
C-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
I
2
C-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
loudnesscontrolsthrougheachstepbetweentheirpresent
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.
7.5.1
S
OURCE SELECTOR
The source selector allows the selection between
6 sources:
2 external stereo inputs (ALI, ARI, BLI and BRI)
1 external symmetrical stereo input (CLIP, CRIP and
CCOM)
1 external symmetrical mono input (MONOP and
MONON)
1 internal stereo input (AM/FM)
1 chime/diagnostic mono input (CHIME).
A chime input signal can be sent to any audio output, at
any volume level, via the chime/diagnostic mono input.
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