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Спецификация SAA4981T изготовлена «Philips» и имеет функцию, называемую «Monolithic integrated 16 : 9 compressor». |
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Детали детали
Номер произв | SAA4981T |
Описание | Monolithic integrated 16 : 9 compressor |
Производители | Philips |
логотип |
20 Pages
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INTEGRATED CIRCUITS
DATA SHEET
SAA4981
Monolithic integrated 16 : 9
compressor
Preliminary specification
Supersedes data of May 1994
File under Integrated Circuits, IC02
1995 Oct 05
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Philips Semiconductors
Monolithic integrated 16 : 9 compressor
Preliminary specification
SAA4981
FEATURES
• Fixed horizontal compression by a factor of 4⁄3 for most
video standards
• Three fixed screen positions (left, centre and right)
• 5 MHz bandwidth
• Bypass function
• Inputs for luminance and chrominance of side panels
• Standard video inputs and outputs (Y, (B−Y) and (R−Y))
• Horizontal and vertical sync signals are not processed
• Pre filters and post filters on chip.
GENERAL DESCRIPTION
The integrated 16 : 9 compressor is an IC which
compresses the active part of a video line by a factor of 4⁄3
from, for example, 52 µs to 39 µs. This is necessary to
display 4:3 video software on a 16 : 9 tube in the correct
proportion. The capacitively coupled video inputs are Y,
(B−Y) and (R−Y).
The synchronisation input HREF is a line frequency
reference signal. The bandwidth of the IC is up to 5 MHz
and the signal delay is realized with SC Line Memories
(Switched Capacitors Line Memories). The output of the
16 : 9 compressor also has the format Y, (B−Y) and (R−Y)
and provides the following two possibilities:
1. Bypass function (the input signal is not compressed)
2. Compressed video by a factor of 4⁄3 with three different
fixed screen positions (left, centre and right). The
luminance and chrominance of the side panels are
determined by the external signals YSIDE, BYSIDE
and RYSIDE.
The horizontal compression is a time discrete and
amplitude continuous signal processing. This provides pre
and post filters which are realized on-chip. The internal
clock generation is achieved with a 54 MHz horizontal PLL
which is synchronized to the positive edge of the HREF
signal. The function of the IC is controlled by the three
control signals CTRL1, CTRL2 and CTRL3.
QUICK REFERENCE DATA
Voltages for video signals are peak-to-peak values for 75% colour bars. All voltages are referenced to
VEEA = VEED = 0 V.
SYMBOL
PARAMETER
MIN.
TYP.
MAX.
VCCA
VCCD
ViY(p-p)
ViU(p-p)
ViV(p-p)
ViHREF
VoY(p-p)
VoU(p-p)
VoV(p-p)
analog supply voltage
4.75 5.0
5.5
digital supply voltage
4.75 5.0
5.5
Y input voltage (peak-to-peak value)
− 0.32 0.45
(B−Y) input voltage (peak-to-peak value)
− 1.33 1.9
(R−Y) input voltage (peak-to-peak value) − 1.05 1.5
input HREF top pulse
3.0 −
6.5
YOUT output voltage (peak-to-peak value)
−
0.32 0.5
(B−Y)OUT output voltage (peak-to-peak value) −
1.33 2.1
(R−Y)OUT output voltage (peak-to-peak value) −
1.05 1.7
UNIT
V
V
V
V
V
V
V
V
V
ORDERING INFORMATION
TYPE NUMBER
SAA4981
SAA4981T
NAME
DIP24
SO24
PACKAGE
DESCRIPTION
plastic dual in-line package; 24 leads (600 mil)
plastic small outline package; 24 leads; body width 7.5 mm
VERSION
SOT101-1
SOT137-1
1995 Oct 05
2
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VCCA
20
23
YIN CLAMP
5 MHz
LOW-PASS FILTER
(B-Y)IN
22
CLAMP
5 MHz
LOW-PASS FILTER
(R-Y)IN
21
CLAMP
5 MHz
LOW-PASS FILTER
VEEA
19
VCCD
8
SC LINE MEMORY
SC LINE MEMORY
VEED
7
MUX
SC LINE
MEMORIES
SUB
4
6.7 MHz
LOW-PASS FILTER
SAA4981
SC LINE MEMORY
SC LINE MEMORY
MUX
SC LINE
MEMORIES
6.7 MHz
LOW-PASS FILTER
SC LINE MEMORY
SC LINE MEMORY
MUX
SC LINE
MEMORIES
6.7 MHz
LOW-PASS FILTER
MUX Y
18
YOUT
C1 C2 C3
MUX BY
17
(B-Y)OUT
C1 C2 C3
MUX RY
16
(R-Y)OUT
HREF
6
HORIZONTAL
SEPARATION
54 MHz
PLL
CONTROLLER
C1
C2
C3
12 9 10 11
TEST
CTRL2
CTRL1
CTRL3
3
CLAMP REFERENCE
1 2 3 24 5
CLMY
CLMRY
CLAOUT
CLMBY
BGREF
C1 C2 C3
3
15 14 13
BYSIDE
YSIDE
RYSIDE
MHA277
Fig.1 Block diagram.
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Номер в каталоге | Описание | Производители |
SAA4981 | Monolithic integrated 16 : 9 compressor | Philips |
SAA4981 | Monolithic integrated 16 : 9 compressor | Philips |
SAA4981T | Monolithic integrated 16 : 9 compressor | Philips |
SAA4981T | Monolithic integrated 16 : 9 compressor | Philips |
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