參數(shù)資料
型號(hào)： STV0056AF
廠商： 意法半導(dǎo)體
英文描述： Satellite Sound and Video Processor(衛(wèi)星探測(cè)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(cè)和視頻處理器）
文件頁數(shù)： 4/27頁
文件大?。?/td> 224K
代理商： STV0056AF
PIN DESCRIPTION
1 - Sound Detection
FMIN
This is the input to the two FM demodulators. It
feeds two AGC amplifiers with a bandwidth of at
least 5-10MHz. There is one amplifier for each
channelboth withthe sameinput.TheAGCampli-
fiers havea 0dB to +40dBrange.
Z
IN
= 5k
, Min input = 2mV
PP
per subcarrier.
Max input = 500mV
PP
(max when all inputs are
addedtogether,when their phasescoincide).
AGC L, AGC R
AGC amplifiers peak detector capacitor connec-
tions.The outputcurrent hasan attack/decayratio
of 1:32. That is the ramp up current is approxi-
mately 5
μ
A and decay current is approximately
160
μ
A. 11V gives maximum gain. These pins are
also driven by a circuit monitoring the voltage on
AMPLKL and AMPLK R respectively.
AMPLK L, AMPLK R
The outputs of amplitude detectors LEFT and
RIGHT.Each requiresa capacitorand a resistorto
GND. The voltage across this is used to decide
whetherthereis a signalbeing receivedby the FM
detector. The level detector output drives a bit in
the detectorI
2
C bus control block.
AMPLK L and AMPLK R drive also respectively
AGCLand AGCR. For instancewhen the voltage
on AMPLK L is > (V
REF
+ 1 V
BE
) it sinks current to
V
REF
from pin AGCLto reducethe AGCgain.
DET L, DETR
Respectivelythe outputsof the FMphasedetector
leftand right.
This is for the connectionof an external loop filter
for the PLL. The output is a push-pull current
source.
CPUMPL, CPUMPR
The output from the frequency synthesizer is a
push-pullcurrentsourcewhichrequiresa capacitor
to groundto derivea voltagetopull the VCOto the
target frequency.The output is
±
100
μ
A to achieve
lockand
±
2
μ
Aduringlocktoprovideatrackingtime
constant of approximately10Hz.
V
REF
This isthe audioprocessorvoltagereferenceused
through out the FM/audio section of the chip. As
such it is essential that it is well decoupled to
ground to reduce as far as possible the risk of
crosstalk and noise injection. This voltage is de-
rived directlyfrom the bandgapreferenceof 2.4V.
The V
REF
output can sink up to 500
μ
A in normal
operationand 100
μ
Awhen in stand-by.
I
REF
Thisis abufferedV
REF
outputto an off-chipresistor
to produce an accurate current reference, within
the chip, for the biasing of amplifiers with current
outputs into filters. It is also required for the Noise
reduction circuit to provide accurate roll-off fre-
quencies. This pin should not be decoupled as it
would inject current noise. The target current is
50
μ
A
±
2% thus a 47.5k
±
1% is required.
A 12V
Double bonded main power pin for the audio/FM
section of the chip. The twobond connectionsare
to the ESD and to power the circuit and on chip
regulators/references.
A GND L
This groundpin 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 groundpin is double bonded :
1) to the volume control, noise reduction system,
ESD + Mux + V
REF
2) to channelright : RF section& VCO
STV0056AF
4/27
相關(guān)PDF資料
PDF描述
STV0056A Satellite Sound and Video Processor(衛(wèi)星探測(cè)和視頻處理器)
STV0297JT Universal digital cable demodulator
STV0297J Universal digital cable demodulator
STV0297J-TMM Universal digital cable demodulator
STV0299B QPSK/BPSK LINK IC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
STV0116 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Encoder Circuit
STV0116FN 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Encoder Circuit
STV0117 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Encoder Circuit
STV0117A 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Encoder Circuit
STV0118 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:PAL/NTSC HIGH PERFORMANCE DIGITAL ENCODER
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*