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參數(shù)資料
| 型號： | STV0056A |
| 廠商： | 意法半導體 |
| 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)： | 4/26頁 |
| 文件大?。?/td> | 247K |
| 代理商： | STV0056A |
A 12V
Double bonded main power pin for the audio/FM
section of the chip. The two bond connectionsare
to the ESD and to power the circuit and on chip
regulators/references.
A GND L
This ground pin is double bonded :
1) to channelLEFT : RF section& VCO,
2) to both AGC amplifiers, channel LEFT and
RIGHT audio filter section.
A GND R
This ground pin is double bonded :
1) to the volume control, noise reduction system,
ESD + Mux + V
REF
2) to channel right : RF section& VCO
BASEBAND AUDIO PROCESSING
PK OUT L, PK OUT R, PK OUT
The noise reduction control loop peak detector
output requires a capacitorto groundfrom this pin,
and a resistor to V
REF
pin to give some accurate
decaytimeconstant.Anonchip5k
±
25 %resistor
and external capacitorgive the attack time.
PK INL, PK IN R or PK IN
Each ofthesepinsisan inputto acontrollooppeak
detector and is connected to the output of the
offchipcontrol loop bandpass filter.
LEVELL, LEVELR
Respectivelythe audio left and right signals of the
FM demodulatorsare output to level L 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 hasa current output which is variable depend-
ing on the inputsignal amplitude as defined bythe
control loop of the noise reduction. The output
current is then dumped into an off-chip capacitor
which togetherwith the accuratecurrent reference
define themin/max rolloff frequencies.Aresistor in
serieswith a capacitoris connectedto groundfrom
these two pins.
J17 L, J17R
The externalJ17 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.
ToperformJ17de-emphasiswith the STV0042,an
externalcircuit is required.
U75 L, U75 R
External deemphasis networks for channels left
andright.Foreachchannelacapacitorand resistor
in parallel of 75
μ
s time constant are connected
betweenhereandV
REF
to provide75
μ
s de-empha-
sis. Internallyselectable is an internal resistor that
can beprogrammedtobeadded inparallelthereby
convertingthe networkto approx 50
μ
s de-empha-
sis (see control blockmap). The value of the inter-
nal resistors is 54k
±
30 %. The amplifier for this
filter is voltageinput, currentoutput ; with
±
500mV
input the output willbe
±
55
μ
A.
VOL L, VOL R
The main audio output from the volume control
amplifier the signalto getoutput signals as 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 drive aSCARTconnectordirectlyvia
AC coupling and meets the standardSCART drive
requirements. These outputs feature high imped-
ance mode for parallelconnection.
S2 OUT L, S2 OUTR, 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
driverequirement.
S2 RTNL, S2 RTN R, S3 RTN L, S3 RTN R
These pins allow auxiliary audiosignalsto be con-
nected to the audio processor and hence makes
use of the on-chip volume control. For additional
details please refer to theaudio switching table.
PIN DESCRIPTION
(continued)
STV0056A
4/26
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相關代理商/技術參數(shù) |
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| STV0056AF | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:SATELLITE SOUND AND VIDEO PROCESSOR |
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| STV0117A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Encoder Circuit |
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