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ML6416
S-Video Filter with Summed Composite Output, Sound Trap, and Group Delay Compensation
Features
* * * * * * * * * * * 7.1MHz Y and C filters, with CV out 14dB notch at 4.5MHz for sound trap 42dB stopband attenuation at 27MHz on Y, C, and CV Better than 1dB flatness to 4.5 MHz on Y, C, and CV RF Modulator output differential group delay between 400kHz and 3.58MHz is typically -170ns. No external frequency select components or clocks 9ns group delay flatness on Y, C, and CV output AC coupled inputs and outputs 0.4% differential gain on Y, C and CV channels, 0.4 differential phase on Y, C and CV channels 0.8% total harmonic distortion on all channels DC restore with low tilt
General Description
The ML6416 is a dual Y/C 4th-order Butterworth lowpass video filter optimized for minimum overshoot and flat group delay. The device also contains a summing circuit to generate filtered 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 filter distortion. In a typical application, the Y and C input signals from DACs are AC coupled into the filter. 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.
Applications
* Cable Set-top Boxes * Satellite Set-top Boxes * DVD Players
Block Diagram
VCC 7
SYNC STRIP, REFERENCE, AND TIMING
4TH - ORDER FILTER
YIN
1
x2
8
YOUT
gM 1V
+
+ gM 1V
x2
6
CVOUT
NOTCH, GROUP DELAY x2
2
RF MOD
CIN
4
4TH - ORDER FILTER
5
COUT
3 GND
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ML6416
PRODUCT SPECIFICATION
Pin Configuration
ML6416 8-Pin SOIC (S08)
YIN RF MOD GND CIN 1 2 3 4 8 7 6 5 YOUT VCC CVOUT COUT
TOP VIEW
Pin Descriptions
Pin # 1 2 3 4 5 6 7 8 Signal Name YIN RF MOD GND CIN COUT CVOUT VCC YOUT Luminance input Output to RF modulator driver Ground Chrominance input Chrominance output Composite video output 5V supply Luminance output Description
Functional Description
Introduction
This product is a dual monolithic continuous time video filter 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 filters approximate a 4th-order Butterworth characteristic with an optimization toward low overshoot and flat 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 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 0.1F. 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 220F or larger AC coupling capacitor.
2
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PRODUCT SPECIFICATION
ML6416
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 specifications. 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.
Typical Applications Diagram
4.5MHz FM SOUND
+ NOTCH AND GROUP DELAY PROTECTION
0.1F YIN
2
220F
VIDEO MODULATOR
VIDEO CABLES
TO CHANNEL 3 OR 4
1
4th-ORDER FILTER +
8
75
YOUT 75 220F 75 TO TV 75
ENCODER
+ 4 4th-ORDER FILTER
6
0.1F CIN
220F 5
75 CVOUT TO VCR 75
0.1F
75 COUT 75
7
5.0V 0.1F 1F
3
Figure 1. Coupled S-Video, Composite Video Line Driver, Sound Trap, and Group Delay Pre-distortion
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ML6416
PRODUCT SPECIFICATION
Absolute Maximum Ratings
Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. Parameter DC Supply Voltage Analog & Digital I/O Output Current (Continuous) CV Channel C and Y Channels Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 10s) Thermal Resistance (JA) -65 Min. -0.3 GND - 0.3 Max. 7 VCC + 0.3 60 30 150 150 260 115 Units V V mA mA C C C C/W
Operating Conditions
Parameter Temperature Range VCC Range Min. 0 4.5 Max. 70 5.5 Units C V
Electrical Characteristics
Unless otherwise specified, VCC = 5.0V 10%, All inputs AC coupled with 100nF, TA = Operating Temperature Range
Symbol ICC VCC AVYC AVCV
Parameter Supply Current Supply Range Low Frequency Gain (YOUT, COUT) at 400KHz at 400KHz at 400KHz Low Frequency Gain (CVOUT) COUT Output Level (During Sync) YOUT Output Level (During Sync) CVOUT Output Level (During Sync)
Conditions
Min. Typ. Max. Units 60 4.5 5.75 6.1 5.55 1.6 0.75 0.75 0.65 5.0 6.0 6.7 5.9 2.0 1.0 1.0 1.0 5 4.2 6.7 4.5 7.1 -42 1.4 40 80 85 5.5 6.25 7.3 6.25 2.4 1.25 1.25 1.35 9 mA V dB dB dB V V V V ms MHz MHz dB VP-P mA
AVRFMOD Low Frequency Gain (RFMOD)
Sync Present on YIN Sync Present on YIN Sync Present on YIN Settled to Within 10mV, 0.1F cap on YIN and CIN No Peaking Cap (Note 1)
RFMOD Output Level (During Sync) Sync Present on YIN tCLAMP f1dB fC fSB Vi ISC Clamp Response Time (Y Channel) -1.0dB Bandwidth (Flatness) (YOUT, COUT, and CVOUT) -3dB Bandwidth (Flatness) (YOUT, COUT, and CVOUT) Stopband Rejection (YOUT, COUT, and CVOUT) Input Signal Dynamic Range (All Channels) Output Short Circuit Current (All Channels) fIN = 27MHz AC Coupled COUT, YOUT, CVOUT, RFMOD to GND (Note 2)
-37 1.2
4
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PRODUCT SPECIFICATION
ML6416
Electrical Characteristics
Symbol CL dG dP THD XTALK Parameter
(continued)
Unless otherwise specified, VCC = 5.0V 10%, All inputs AC coupled with 100nF, TA = Operating Temperature Range
Conditions All Outputs YOUT, COUT, and CVOUT YOUT, COUT, and CVOUT VOUT = 1.8VP-P, Y/C Out at 3.58MHz From CIN of 0.5VP-P at 3.58MHz to YOUT From YIN Input of 0.4VP-P at 3.58MHz, to COUT
Min. Typ. Max. Units 35 0.4 0.4 0.8 -45 -50 -30 -65 -60 -55 30 -55 -58 -40 -75 -70 -65 70 9 0 0 95 35 104 110 1 1 1.0 pF % % dB dB dB dB dB dB ns ns ns ns % ns ns % % dB dB dB 5 -50 50 dB ns
Output Shunt Capacitance (All Channels) (Note 5) Differential Gain (Note 5) Differential Phase (Note 5) Output Distortion (All Channels) (Note 5) Crosstalk (Note 5)
PSRR SNR
PSRR (All Channels) (Note 5) Y, C Channel (Note 5) CV Channel (Note 5) RFMOD Channel (Note 5)
0.5VP-P (100KHz) at VCC NTC-7 weighting 4.2 MHz lowpass NTC-7 weighting 4.2 MHz lowpass NTC-7 weighting 4.2 MHz lowpass
tpd tpd tSKEW TCLDCV TCLGCV GDMOD
Propagation Delay (Y, C, CV) (Note 5) Group Delay Deviation from Flatness to 3.58MHz (NTSC) (Y, C, and CV) (Note 5) Skew Between YOUT and COUT (Note 5) Chroma-Luma Delay CVOUT Chroma-Luma Gain CVOUT Group Delay RFMOD at 1MHz
f = 3.58 MHz (referenced to 400kHz) -35 f = 3.58 MHz (referenced to 400kHz) 92
f = 3.58MHz (referenced to 400kHz) -205 -170 -135 f = 3.58MHz (referenced to 400kHz) -185 -150 -115 f = 3.58MHz (referenced to 400kHz) RFMOD Channel RFMOD Channel RFMOD Channel at 2.0MHz -0.5 14 From 4.425MHz to 4.63MHz At 4.2MHz f = 200kHz to f = 3MHz 95 100 1.5 1.0 0.5 105 4 1.5 0.75
TCLDMOD Chroma-Luminance Delay RFMOD TCLGMOD Chroma-Luminance Gain RFMOD dGRFMOD Differential Gain dPRFMOD Differential Phase pK MCF AV AV TPASS Gain Peaking (Note 3) Notch Attenuation (Note 3) Notch Attenuation (Note 3) Passband Group Delay, RFMOD (Note 4)
Modulator Channel Flatness (Note 3) at 3.75MHz
-0.1 +0.75
Notes 1. Peaking capacitor increases CV output at 4.2MHz nominally by 0.7dB 2. Sustained short circuit protection limited to 10 seconds 3. Referenced to 400kHz 4. Group Delay is tested down to 400kHz but guaranteed by design to 200kHz. 5. Guaranteed by characterization
REV. 1.0.6 8/26/02
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ML6416
PRODUCT SPECIFICATION
Mechanical Dimensions Inches (millimeters)
Package: S08 8-Pin SOIC
0.189 - 0.199 (4.80 - 5.06) 8
PIN 1 ID
0.148 - 0.158 0.228 - 0.244 (3.76 - 4.01) (5.79 - 6.20)
1 0.017 - 0.027 (0.43 - 0.69) (4 PLACES) 0.050 BSC (1.27 BSC) 0.059 - 0.069 (1.49 - 1.75) 0 - 8
0.055 - 0.061 (1.40 - 1.55)
0.012 - 0.020 (0.30 - 0.51) SEATING PLANE
0.004 - 0.010 (0.10 - 0.26)
0.015 - 0.035 (0.38 - 0.89)
0.006 - 0.010 (0.15 - 0.26)
6
REV. 1.0.6 8/26/02
ML6416
PRODUCT SPECIFICATION
Ordering Information
Part Number ML6416CS Temperature Range 0 to 70 Package 8 Pin SOIC (S08)
DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user.
www.fairchildsemi.com 8/26/02 0.0m 001 Stock#DS30006416 2001 Fairchild Semiconductor Corporation
2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.

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