參數(shù)資料
型號： STV0056A
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)： 3/26頁
文件大?。?/td> 247K
代理商： STV0056A
Pin Number
45
46
47
48
49
50
51
52
53
54
55
56
Name
A 12V
AMPLK R
DET R
U75 R
CPUMP R
I
REF
PK OUT R
PK OUT L
LEVEL L
PK IN L
FC L
A GND R
Function
Audio 12V Supply
Amplitude Detector Capacitor Left
FM PLL Filter Right
Deemphasis Time Constant Right
FM PLL Charge Pump Capacitor Right
Current Reference Resistor
Noise Reduction Peak Detector Output Right
Noise Reduction Peak Detector Output Left
Noise Reduction Level Left
Noise Reduction Peak Detector Input
Audio Roll-off Left
Audio Ground
0
PIN ASSIGNMENT
(continued)
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
channel both with the same input. The AGC ampli-
fiers have a 0dB to +40dB range.
Z
IN
= 5k
, Min input = 2mV
PP
persubcarrier.
Max input = 500mV
PP
(max when all inputs are
added together,when theirphasescoincide).
AGC L, AGC R
AGC amplifiers peak detector capacitor connec-
tions. The output current has an 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. 11Vgives maximum gain. These pins are
also driven by a circuit monitoring the voltage on
AMPLK Land AMPLK R respectively.
AMPLKL, AMPLK R
The outputs of amplitude detectors LEFT and
RIGHT. Each requiresa capacitorand a resistorto
GND. The voltage across this is used to decide
whether thereis a signal beingreceived by 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
AGC Land AGCR. For instancewhen the voltage
on AMPLKL is > (V
REF
+ 1 V
BE
) it sinks current to
V
REF
frompin AGCLto reducethe AGC gain.
DET L, DET R
Respectivelythe outputsof the FM phasedetector
left and right.
This is for the connectionof an external loop filter
for the PLL. The output is a push-pull current
source.
CPUMP L, CPUMPR
The output from the frequency synthesizer is a
push-pullcurrent sourcewhich requiresacapacitor
to ground to derive a voltage to pull the VCOto the
target frequency.The output is
±
100
μ
A to achieve
lockand
±
2
μ
Aduringlock toprovideatrackingtime
constantof approximately10Hz.
V
REF
This is theaudio processorvoltagereferenceused
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-
riveddirectly from the bandgap reference of 2.4V.
The V
REF
output can sink up to 500
μ
A in normal
operationand 100
μ
Awhen in stand-by.
I
REF
ThisisabufferedV
REF
outputto anoff-chipresistor
to produce an accurate current reference, within
the chip, for the biasing of amplifiers with current
outputs into filters. It is alsorequired for the Noise
reduction circuit to provide accurate roll-off fre-
quencies. This pin should not be decoupledas it
would inject current noise. The target current is
50
μ
A
±
2% thusa 47.5k
±
1% is required.
PIN DESCRIPTION
STV0056A
3/26
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