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ML6426CS-2 Datasheet(PDF) 6 Page - Micro Linear Corporation

Part # ML6426CS-2
Description  High Bandwidth Triple Video Filters with Buffered Outputs for RGB or YUV
PDF  17 Pages
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Manufacturer  MICRO-LINEAR [Micro Linear Corporation]
Direct Link  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML6426CS-2 Datasheet(HTML) 6 Page - Micro Linear Corporation

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ML6426
6
November, 1999
FUNCTIONAL DESCRIPTION
The ML6426 is a triple monolithic continuous time video
filter designed for reconstructing video signals from an
YUV/RGB video D/A source. The ML6426 is intended for
use in AC coupled input and output applications.
The filters approximate a 4th-order Butterworth
characteristic with an optimization toward low overshoot
and flat group delay. All outputs are capable of driving
2VP-P into AC coupled 150W video loads, with up to 35pF
of load capacitance. All outputs are capable of driving a
75
W load at 1VP-P.
All channels are clamped during sync to establish the
appropriate output voltage swing range (DC restore). Thus
the input coupling capacitors do not behave according to
the conventional RC time constant. In most applications,
the ML6426's input coupling capacitors are only 0.1µF.
Figure 1. Typical Application Schematic
An external CMOS compatible HSYNC pulse is required
which is Active High on the SYNC IN Pin. See Figure 2.
During sync, the feedback clamp sources/sinks current to
restore the DC level. The net result is that the average
input current is zero. Any change in the input coupling
capacitors' value will linearly affect the clamp response
times.
Each channel is essentially tilt-free. Each input is
clamped by a feedback amp which responds to the output
during sync.
The ML6426 is robust and stable under all stated load and
input conditions. Bypassing both VCC pins directly to
ground ensures this performance.
RIN
5V
5V
R
G
0.1µF
220µF 75Ω
GIN
0.1µF
220µF 75Ω
B
220µF 75Ω
BIN
SYNC IN
0.1µF
RINA/YINA
2
RINB/YINB
BINA/VINA
8
BINB/VINB
9
A/B MUX
GINA/UINA
6
GINB/UINB
7
ROUT/YOUT
13
GOUT/UOUT
11
BOUT/VOUT
10
4th-ORDER
FILTER A
4th-ORDER
FILTER B
4th-ORDER
FILTER C
MUX
MUX
MUX
×2
×2
×2
TRANSCONDUCTANCE
ERROR AMP
TRANSCONDUCTANCE
ERROR AMP
TRANSCONDUCTANCE
ERROR AMP
1
SYNCIN
16
GNDO
14
DISABLE
15
VCCO
12
VCC
4
GND
3
5
+
–
+
–
+
–
0.5V
0.5V
0.5V
ACTIVE HIGH
Figure 2. SYNC IN Pulse Width
VIL = 1.0V
50% x VSYNC IN
VIH = 2.5V
PWMIN = 2µS



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