Page 1
ML6415 S-Video Filter with Summed Composite
Output, Sound Trap, and Group Delay Compensation
GENERAL DESCRIPTION FEATURES
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, providing 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 150Ω load (1Vp-p 75Ω
coax load). The Y, C, CV, and notch channels have a gain
of approximately 2 (6dB) with 1Vp-p input levels.
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, 0.4º
differential phase on Y, C and CV channels
n 0.8% total harmonic distortion on all channels
n DC restore with low tilt
APPLICATIONS
n Cable Set-top Boxes
n Satellite Set-top Boxes
n DVD Players
June, 2000DATASHEET
Page 2
ML6415
TABLE OF CONTENTS
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
WARRANTY
© 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.
Datasheet June, 20002
Page 3
SIMPLIFIED BLOCK DIAGRAM
SYNC STRIP,
REFERENCE,
AND TIMING
ML6415
VCC
7
YIN
CIN
1
4
4TH – ORDER
FILTER
gM
1V
gM
4TH – ORDER
FILTER
1V
+
Σ
+
×2
×2
3
GND
×2
NOTCH,
GROUP
DELAY
6
2
5
YOUT
CVOUT
RF MOD
COUT
June, 2000 Datasheet 3
Page 4
PIN CONFIGURATION
YIN
RF MOD
GND
CIN
ML6415
-Pin SOIC S0
1
2
3
4
TOP VIEW
7
6
5
ML6415
YOUT
VCC
CVOUT
COUT
PIN DESCRIPTIONS
PIN # Signal Name Description
1 YIN Luminance input
2 RF MOD Output to RF modulator driver
3 GND Ground
4 CIN Chrominance input
5 COUT Chrominance output
6 CVOUT Composite video output
7 VCC 5V supply
8 YOUT Luminance output
Datasheet June, 20004
Page 5
FUNCTIONAL DESCRIPTION
INTRODUCTION
ML6415
This product is a dual monolithic continuous time video
fi lter designed for reconstructing the luminance and chrominance signals from an S-Video D/A source. Composite
video output is generated by summing the Y and C outputs. 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 Butterworth 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 150Ω 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 conventional 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
0.1µF. The Y and C input typically sinks 1µA during active
video, which nominally tilts a horizontal line by about
2mV at the Y output. During sync, the clamp typically
sources 20µA 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.
CHROMINANCE (C) I/O
The chroma input is driven by a low impedance
source of 0.7Vp-p or the output of a 75Ω terminated
line. The input is required to be AC coupled via a
0.1µF coupling capacitor which allows for a clamp
setting time of 5ms. The chroma output is capable
of driving an AC coupled 150Ω load at 2VP-P,
or 1VP-P into a 75Ω load. Up to 35pF of load
capacitance can be driven without stability or slew issues.
A 0.1µF 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 600Ω load
to 2VP-P, but is primarily intended to drive a modulator
load.
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 75Ω terminated line. The
input is required to be AC coupled via a 0.1µF coupling
capacitor which allows for a settling time of 5ms. The
luma output is capable of driving an AC coupled 150Ω
load at 2VP-P, or 1VP-P into a 75Ω 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
400µF or larger AC coupling capacitor.
June, 2000 Datasheet 5
Page 6
TYPICAL APPLICATIONS DIAGRAM
4.5MHz fM SOUND
NOTCH
YIN
ENCODER
CIN
5.0V
0.1 F
0.1 F
1
4
AND GROUP
DELAY
PROTECTION
4th-ORDER
FILTER
+
Σ
+
4th-ORDER
FILTER
37
2
6
5
0.1 F
+
Σ
400 F
VIDEO MODULATOR
75Ω
400 F
75Ω
400 F
75Ω
75Ω
VIDEO CABLES
ML6415
TO CHANNEL 3 OR 4
YOUT
75Ω
CVOUT TO TV
75Ω
CVOUT TO VCR
Ω
75
COUT
75Ω
1F0.1 F
Figure 1. Coupled S-Video, Composite Video Line Driver, Sound Trap, and Group Delay Pre-distortion
Datasheet June, 20006
Page 7
ELECTRICAL CHARACTERISTICS
ML6415
ABSOLUTE MAXIMUM RATINGS
Absolute maximum ratings are those values beyond which
the device could be permanently damaged. Absolute
OPERATING CONDITIONS
Temperature Range ....................................... 0°C to 70°C
VCC Range................................................... 4.5V to 5.5V
maximum ratings are stress ratings only and functional
device operation is not implied.
DC Supply Voltage ....................................... –0.3V to 7V
Analog & Digital I/O..............GND – 0.3V to VCC + 0.3V
Output Current (Continuous)
CV Channel .........................................................60mA
C and Y Channels ................................................30mA
Junction Temperature ............................................. 150°C
Storage Temperature Range......................–65°C to 150°C
Lead Temperature (Soldering, 10s).......................... 260°C
Thermal Resistance (θJA) ....................................115°C/W
ELECTRICAL TABLES
Unless otherwise specifi ed, VCC = 5.0V ±10%, All inputs AC coupled with 100nF, TA = Operating Temperature Range
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
ICC Supply Current No Load 60 75 mA
VCC Supply Range 4.5 5.0 5.5 V
AV Low Frequency Gain (Y, C) VIN = 100mVP-P at 400KHz 5.75 6.0 6.25 dB
AV Low Frequency Gain (modulator) VIN = 100mVP-P at 400KHz 6.1 6.7 7.3 dB
Low Frequency Gain (CV) VIN = 100mVP-P at 400KHz 5.4 5.75 6.25 dB
C DC Output Level (During Sync) Sync Present on Y 1.6 2.0 2.4 V
Y Sync Output Level Sync Present on Y 0.75 1.0 1.25 V
Y+C Sync Output Level Sync Present on Y 0.75 1.0 1.25 V
Notch Output Level Sync Present on Y 0.65 1.0 1.35 V
tCLAMP Clamp Response Time (Y Channel) Settled to Within 10mV 5 ms
f1dB –1.0dB Bandwidth (Flatness) (Y, C, and CV) 4.0 4.5 MHz
fC –3dB Bandwidth (Flatness) (Y, C, and CV) 7.1 MHz
0.8fC 0.8 x fC Attenuation (Y, C) 1.5 dB
fSB Stopband Rejection (Y, C, and CV) fIN = 27MHz to 100MHz worst case -37 –42 dB
Vi Input Signal Dynamic Range (All Channels) AC Coupled 1.4 VP-P
OS Peak Overshoot (Y, C, and CV) 2VP-P Output Pulse (loaded) 4.3 %
ISC Output Short Circuit Current (All Channels) VOUT C, Y, CV, or notch to GND
(Note 1) 40 80 mA
CL Output Shunt Capacitance Drive (All Channels) All Outputs 35 pF
dG Differential Gain Y, C, and CV Outputs 0.4 %
dP Differential Phase Y, C, and CV Outputs 0.4 º
THD Output Distortion (All Channels) VOUT = 1.8VP-P, 0.8 %
Y/C Out at 3.58MHz
XTALK Crosstalk From C Input of 0.5VP-P –55 dB
at 3.58MHz to Y Output
From Y Input of 0.4VP-P at 3.58MHz, –58 dB
to C Output
PSRR PSRR (All Channels) 0.5VP-P (100kHz) at VCC –40 dB
June, 2000 Datasheet 7
Page 8
ML6415
ELECTRICAL TABLES (CONTINUED)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
tpd Group Delay (Y, C, CV) 100kHz 70 ns
SNR Y, C Channel NTC-7 weighting 4.2 MHz lowpass -75 dB
CV Channel NTC-7 weighting 4.2 MHz lowpass -69 dB
Mod Channel NTC-7 weighting 4.2 MHz lowpass -60 dB
∆tpd Group Delay Deviation from Flatness
(Y, C, and CV) to 3.58MHz (NTSC) 9 ns
tSKEW Skew Between Y & C Outputs at 1MHz 0 ns
Tpd Group Delay RF Modulator Output f = 3.58MHz (referenced to 3MHz) -130 –170 -230 ns
dG Differential Gain Modulator Channel 1.5 %
dP Differential Phase Modulator Channel 1.0 º
pK Gain Peaking (Note 2) Modulator Channel at 2.0MHz 0.5 0.75 dB
MCF Modulator Channel Flatness (Note 2) at 3.75MHz -0.5 +0.75 dB
AV Notch Attenuation (Note 2) From 4.37MHz to 4.63MHz 14 dB
PSRRmt Supply Sensitivity Modulator
Channel Flatness VCC=4.5V to 5.5V at 3.8MHz 0.12 dB/V
TCm Modulator Channel Flatness
Temperature Sensitivity VCC=5V 3.8MHz -0.04 dB/ºC
Note 1: Sustained short circuit protection limited to 10 seconds
Note 2: Referenced to 300KHz
Datasheet June, 20008
Page 9
PHYSICAL DIMENSIONS
ML6415
Package S0
-Pin SOIC
0.1 9 - 0.199
(4. 0 - 5.06)
0.017 - 0.027
(0.43 - 0.69)
(4 PLACES)
0.055 - 0.061
(1.40 - 1.55)
PIN 1 ID
1
0.050 BSC
(1.27 BSC)
0.012 - 0.020
(0.30 - 0.51)
SEATING PLANE
0.14 - 0.15
(3.76 - 4.01)
0.059 - 0.069
(1.49 - 1.75)
0.22 - 0.244
(5.79 - 6.20)
0.004 - 0.010
(0.10 - 0.26)
0º - º
0.015 - 0.035
(0.3 - 0. 9)
0.006 - 0.010
(0.15 - 0.26)
ORDERING INFORMATION
PART NUMBER TEMPERATURE RANGE PACKAGE
ML6415CS 0º to 70º 8 Pin SOIC (S08)
Micro Linear Corporation
2092 Concourse Drive
San Jose, CA 95131
Tel: (408) 433-5200
Fax: (408) 432-0295
www.microlinear.com
DS6415-01
June, 2000 Datasheet 9
Loading...