參數(shù)資料
型號： STV0056AF
廠商： 意法半導(dǎo)體
英文描述： Satellite Sound and Video Processor(衛(wèi)星探測和視頻處理器)
中文描述： 衛(wèi)星聲音和視頻處理器（衛(wèi)星探測和視頻處理器）
文件頁數(shù)： 5/27頁
文件大?。?/td> 224K
代理商： STV0056AF
PIN DESCRIPTION
(continued)
2 - BasebandAudio Processing
PK OUT L, PK OUT R, PK OUT
The noise reduction control loop peak detector
outputrequiresa capacitorto groundfrom thispin,
and a resistor to V
REF
pin to give some accurate
decaytimeconstant.Anonchip5k
±
25%resistor
and externalcapacitorgive the attacktime.
PK IN L, PK IN R or PK IN
Eachof thesepinsis aninputtoa controllooppeak
detector and is connected to the output of the
offchipcontrol loop band pass filter.
LEVELL, LEVELR
Respectivelythe audio left and right signals of the
FMdemodulators areoutput to levelL and level R
pins through an input follower buffer. The off-chip
filters driven by these pins must include AC cou-
pling to the next stage (PK IN L and PK IN R pins
respectively).
FC L, FC R
The variable bandwidth transconductance ampli-
fier has a currentoutput which is variabledepend-
ingon theinput signal amplitudeas defined bythe
control loop of the noise reduction. The output
current is then dumped into an off-chip capacitor
whichtogetherwith theaccuratecurrent reference
definethemin/maxrolloff frequencies.Aresistorin
serieswith acapacitoris connectedtoground from
thesetwo pins.
J17 L, J17 R
The external J17 de-emphasisnetworks for chan-
nels left and right. The amplifier for this filter is
voltageinput, current output.Output with
±
500mV
input will be
±
55
μ
A.
ToperformJ17 de-emphasiswiththeSTV0042,an
externalcircuit is required.
U75 L, U75 R
External deemphasis networks for channels left
andright.Foreachchannelacapacitorandresistor
in parallel of 75
μ
s time constant are connected
betweenhereandV
REF
toprovide75
μ
sde-empha-
sis. Internally selectableis an internalresistor that
canbe programmedto beaddedinparallelthereby
convertingthe network to approx 50
μ
s de-empha-
sis (see controlblock map). The value of theinter-
nal resistors is 54k
±
30 %. The amplifier for this
filter is voltageinput,current output; with
±
500mV
input the output will be
±
55
μ
A.
VOLL, VOLR
The main audio output from the volume control
amplifier the signalto get outputsignalsas highas
2V
RMS
(+12dB) on a DC bias of 4.8V. Control is
from +12dB to -26.75dB plus Mute with 1.25dB
steps.Thisamplifierhasshortcircuitprotectionand
is intendedto drivea SCARTconnectordirectlyvia
AC couplingand meetsthe standardSCARTdrive
requirements. These outputs feature high imped-
ance mode for parallelconnection.
S2 OUT L, S2 OUT R, S3 OUT L, S3 OUT R
These audio outputs are sourced directly from the
audio MUX, and as a result do not include any
volume control function. They will output a 1V
RMS
signal biased at 4.8V. They are short circuit pro-
tected. These outputs feature high impedance
mode for parallel connection and meet SCART
drive requirement.
S2 RTN L, S2 RTN R, S3 RTN L, S3 RTN R
These pins allow auxiliaryaudio signals to be con-
nected to the audio processor and hence makes
use of the on-chip volume control. For additional
details please refer to the audio switching table.
STV0056AF
5/27
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