The ML6415 is a dual Y/C 4th-order Butterworth lowpass
video fi lter optimized for minimum overshoot and fl at
group delay. The device also contains a summing circuit
to generate fi ltered composite video, an audio trap and
group delay compensation circuit to notch-out audio, pro-
viding an area for the addition of the FM audio carrier(s)
and mimic the group delay distortion introduced at the
transmitter. The group delay predistortion compensates
for the nominal TV receiver IF fi lter distortion.
In a typical application, the Y and C input signals from
DACs are AC coupled into the fi lter. Both channels have
DC restore circuitry to clamp the DC input levels during
video sync. The Y and C channels use a separate feedback
clamp. The clamp pulse is derived from the Y channel.
The outputs are AC coupled. The Y, C, CV, and modulator
outputs can drive 2Vp-p into a 150
load (1Vp-p 75
coax load). The Y, C, CV, and notch channels have a gain
of approximately 2 (6dB) with 1Vp-p input levels.
June, 2000
DATASHEET
GENERAL DESCRIPTION
FEATURES
APPLICATIONS
n 7.1MHz Y and C fi lters, with CV out
n 14dB notch at 4.5MHz for sound trap
n 42dB stopband attenuation at 27MHz on Y, C, and CV
n Better than 1dB fl atness to 4.5 MHz on Y, C, and CV
n RF Modulator output differential group delay between
3.0MHz and 3.58MHz is typically -170ns.
n No external frequency select components or clocks
n 9ns group delay fl atness on Y, C, and CV output
n 5% overshoot on Y, C, and CV output edges
n AC coupled inputs and outputs
n 0.4% differential gain on Y, C and CV channels, 0.4
differential phase on Y, C and CV channels
n 0.8% total harmonic distortion on all channels
n DC restore with low tilt
ML6415 S-Video Filter with Summed Composite
Output, Sound Trap, and Group Delay Compensation
n Cable Set-top Boxes
n Satellite Set-top Boxes
n DVD Players
Datasheet
June, 2000
2
ML6415
General Description..........................................................................................................................................1
Features ............................................................................................................................................................1
Applications ......................................................................................................................................................1
Warranty Information.......................................................................................................................................2
Simplifi ed Block Diagram .................................................................................................................................3
Pin Confi guration..............................................................................................................................................4
Pin Descriptions................................................................................................................................................4
Functional Description......................................................................................................................................5
Typical Applications Diagram ...........................................................................................................................6
Electrical Characteristics...................................................................................................................................7
Electrical Tables ................................................................................................................................................7
Physical Dimensions .........................................................................................................................................9
Order Information ............................................................................................................................................9
Micro Linear 2000.
is a registered trademark of Micro Linear Corporation. All other trademarks are the
property of their respective owners.
Products described herein may be covered by one or more of the following U.S. patents: 4,897,611; 4,964,026; 5,027,116;
5,281,862; 5,283,483; 5,418,502; 5,508,570; 5,510,727; 5,523,940; 5,546,017; 5,559,470; 5,565,761; 5,592,128;
5,594,376; 5,652,479; 5,661,427; 5,663,874; 5,672,959; 5,689,167; 5,714,897; 5,717,798; 5,742,151; 5,747,977;
5,754,012; 5,757,174; 5,767,653; 5,777,514; 5,793,168; 5,798,635; 5,804,950; 5,808,455; 5,811,999; 5,818,207;
5,818,669; 5,825,165; 5,825,223; 5,838,723; 5.844,378; 5,844,941. Japan: 2,598,946; 2,619,299; 2,704,176; 2,821,714.
Other patents are pending.
Micro Linear makes no representations or warranties with respect to the accuracy, utility, or completeness of the contents
of this publication and reserves the right to make changes to specifi cations and product descriptions at any time without
notice. No license, express or implied, by estoppel or otherwise, to any patents or other intellectual property rights is
granted by this document. The circuits contained in this document are offered as possible applications only. Particular
uses or applications may invalidate some of the specifi cations and/or product descriptions contained herein. The customer
is urged to perform its own engineering review before deciding on a particular application. Micro Linear assumes
no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of Micro Linear
products including liability or warranties relating to merchantability, fi tness for a particular purpose, or infringement of
any intellectual property right. Micro Linear products are not designed for use in medical, life saving, or life sustaining
applications.
WARRANTY
TABLE OF CONTENTS
June, 2000
Datasheet
5
ML6415
INTRODUCTION
This product is a dual monolithic continuous time video
fi lter designed for reconstructing the luminance and chro-
minance signals from an S-Video D/A source. Composite
video output is generated by summing the Y and C out-
puts. The chip is intended for use in applications with AC
coupled input and AC coupled outputs. (See Figure 1)
The reconstruction fi lters approximate a 4th-order But-
terworth characteristic with an optimization toward low
overshoot and fl at group delay. Y, C, and CV outputs are
capable of driving 2VP-P into AC coupled 150
video
loads, with up to 35pF of load capacitance at the output
pin.
All channels are clamped during sync to establish the
appropriate output voltage swing range. Thus the input
coupling capacitors do not behave according to the con-
ventional RC time constant. Clamping for all channels
settles to less than 10mv within 5ms of a change in video
input sources.
In most applications the input coupling capacitors are
0.1F. The Y and C input typically sinks 1A during active
video, which nominally tilts a horizontal line by about
2mV at the Y output. During sync, the clamp typically
sources 20A to restore the DC level. The net result is that
the average input current is zero.
Any change in the input coupling capacitor's value will
inversely alter the amount of tilt per line. Such a change
will also linearly affect the clamp response times.
This product is robust and stable under all stated load
and input conditions. Capacitive bypassing VCC directly to
ground ensures this performance.
LUMINANCE (Y) I/O
The luma input is driven by either a low impedance source
of 1Vp-p or the output of a 75
terminated line. The
input is required to be AC coupled via a 0.1F coupling
capacitor which allows for a settling time of 5ms. The
luma output is capable of driving an AC coupled 150
load at 2VP-P, or 1VP-P into a 75
load. Up to 35pF of
load capacitance (at the output pin) can be driven without
stability or slew issues. The output is AC coupled with a
400F or larger AC coupling capacitor.
FUNCTIONAL DESCRIPTION
CHROMINANCE (C) I/O
The chroma input is driven by a low impedance
source of 0.7Vp-p or the output of a 75
terminated
line. The input is required to be AC coupled via a
0.1F coupling capacitor which allows for a clamp
setting time of 5ms. The chroma output is capable
of driving an AC coupled 150
load at 2VP-P,
or 1VP-P into a 75
load. Up to 35pF of load
capacitance can be driven without stability or slew issues.
A 0.1F AC coupling capacitor is recommended at the
output. (This reduces the circuit cost as chroma does not
contain low frequency components.)
COMPOSITE VIDEO (CV) OUTPUT
The composite video output is capable of driving 2 loads
to 2VP-P. It is intended to drive a TV and a VCR. Either
the TV input or the VCR input can be shorted to ground
and the other output will still meet specifi cations. Up to
35pF of load capacitance (at the output pin) can be driven
without stability or slew issues.
RF MODULATOR OUTPUT
The RF modulator output is capable of driving a 600
load
to 2VP-P, but is primarily intended to drive a modulator
load.
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