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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)： | 6/27頁 |
| 文件大?。?/td> | 224K |
| 代理商： | STV0056AF |
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PIN DESCRIPTION
(continued)
3 - VideoProcessing
B-BAND IN
AC-coupled video input from a tuner.
Z
IN
> 10k
±
25%. This drives an on-chip video
amplifier. The other input of this amp is AC
groundedby being connectedto an internalV
REF
.
The video amplifier has selectable gain from 0dB
to 12.7dBin 63 steps and its output signal can be
selectednormal or inverted.
UNCLDEEM
Deemphasizedstillunclamped output.It isalso an
input of the video matrix.
VIDEEM1
Connected to an external de-emphasis network
(for instance625 lines PALde-emphasis).
VIDEEM2/ 22kHz
Connected to an external de-emphasis network
(forinstance525linesNTSCor othervideode-em-
phasis).Alternativelyaprecise22kHztonemaybe
outputby I
2
C bus control.
CLAMP IN
This pin clamps the most negative extreme of the
input(the synctips) to 2.7V
DC
(or appropriatevolt-
age). The video at the clamp input is only 1V
PP
.
This clamped video which is de-emphasised, fil-
tered and clamped (energy dispersal removed) is
normal, negative syncs, video. This signal drives
the Video Matrix input called Normal Video.
It hasa weak(1.0
μ
A
±
15 %) stablecurrentsource
pullingthe inputtowardsGND.Otherwisethe input
impedanceis very high at DC to 1kHz Z
IN
> 2M
.
Video bandwidth through this is -1dB at 5.5MHz.
The CLAMPinput DC restore voltageis then used
as a means for getting the correct DC voltage on
the SCART outputs.
S3 VID RTN
This input can be driven for instance by the de-
coder.This inputhas a DC restorationclampon its
input.Theclampsink currentis 1
μ
A
±
15%with the
bufferZ
IN
> 1M
.
S2 VID RTN, S1 VID RTN
Externalvideoinput1.0V
pp
ACcoupled75
source
impedance.This input has a DC restorationclamp
on its input. The clamp sink current is 1
μ
A
±
15%
withthe bufferZ
IN
> 1M
. This signalis an inputto
the Video Matrix.
S1 VID OUT, S2 VID OUT
Video drivers for SCART 1 and SCART 2. An
externalemitter follower bufferis required to drive
a 150
load. The average DC voltage to be 1.5V
on the O/P. Thesignalis video2.0V
PP
5.5MHzBW
with sync tip = 1.2V. These pins get signals from
the Video Matrix. The signal selected from the
Video Matrix for output on this pin is controlled by
a control register. This output also feature a high
impedancemode for parallelconnection.
S3 VID OUT
This output can drive for instance a decoder.Also
it is able to pass 10MHz ; Z
OUT
< 75
. Video on
this pin will be 2V
PP
. The black level of the ouput
video signal can be adjustedthrough I
2
C buscon-
trol to easily interface with on-board Videocrypt
decoder. This output feature an high impedance
mode for parallelconnection.
V 12V
+ 12Vdoublebonded: ESD+guardringsandvideo
circuit power.
V GND
Doubledbonded.Clean VID INGND. Strategically
placed video power ground connection to reduce
video currents getting into the rest of the circuit.
4 - Control Block
GND 5V
The main power ground connectionfor the control
logic, registers, the I
2
C bus interface, synthesizer
& watchdogand XTLOSC.
V
DD
5V
Digital +5V power supply.
SCL
ThisistheI
2
C busclockline.Clock= DCto100kHz.
Requires external pull up eg. 10k
to 5V.
SDA
This isthe I
2
C bus dataline.Requiresexternalpull
up eg. 10k
to 5V.
I/O / 22kHz
Generalpurposeinput outputpin or 22kHz output.
XTL
Thispinallowsfor theon-chiposcillatorto beeither
used with a crystalto ground of 4MHzor 8MHz,or
to be driven by an external clock source. The
external source can be either 4MHz or 8MHz. A
programmablebitinthecontrolblockremovesa
÷
2
block when the 4MHz option is selected.
HA
Hardware addresswith internal 135
μ
Apull down.
Chip address is 06 when this pin is grouded and
chip addressis 46 when connectedto V
DD
.
STV0056AF
6/27
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