FMS6406 Precision S-Video Filter with Summed Composite Output, Sound Trap, and Group Delay Compensation Features Description ■ 7.6MHz 5th-order Y,C filters with composite summer The FMS6406 is a dual Y/C 5th-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. The audio trap removes video information in the spectral location of the subsequent RF audio carrier. The group delay circuit predistorts the signal to compensate for the inherent receiver IF filter’s group delay distortion. ■ 14dB notch at 4.425MHz to 4.6MHz for sound trap ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ capable of handling stereo 50dB stopband attenuation at 27MHz on Y, C, and CV outputs Better than 0.5dB flatness to 4.2MHz on Y, C, and CV outputs Equalizer and notch filter for driving RF modulator with group delay of -180ns No external frequency selection components or clocks < 5ns group delay on Y, C, and CV outputs AC coupled inputs AC or DC coupled outputs Capable of PAL frequency for Y, C, CV Continuous Time Low Pass Filters <1.4% differential gain with 0.7° differential phase on Y, C, and CV channels Integrated DC restore circuitry with low tilt In a typical application, the Y and C input signals from DACs are AC-coupled into the filters. Both channels have DC-restore circuitry to clamp the DC-input levels during video sync. The Y and C channels use separate feedback clamps. The clamp pulse is derived from the Y channel. All outputs are capable of driving 2Vpp, AC or DC-coupled, into either a single or dual video load. A single video load consists of a series 75W impedance matching resistor connected to a terminated 75W line, this presents a total of 150W of loading to the part. A dual load would be two of these in parallel which would present a total of 75W to the part. The gain of the Y, C and CV signals is 6dB with 1Vpp input levels. All video channels are clamped during sync to establish the appropriate output voltage reference levels. Applications ■ Cable set-top boxes ■ Satellite set-top boxes ■ DVD players Block Diagram VCC 7 Sync Strip Reference and Timing YIN 1 6dB gM 250mV Σ Notch Group Delay 250mV CIN 4 YOUT 6 CV OUT 2 EQ_NOTCH 5 COUT + + gM 8 6dB 3 GND Ordering Information Part Number FMS6406CS FMS6406CSX © 2006 Fairchild Semiconductor Corporation FMS6406 Rev. 4.0.4 Package Pb-Free Operating Temp Range Packaging Method SOIC-8 SOIC-8 Yes Yes 0°C to +70°C 0°C to +70°C Tube Tape and Reel www.fairchildsemi.com FMS6406 Precision S-Video Filter with Summed Composite Output, Sound Trap, and Group Delay Compensation August 2006 YIN 1 EQ_NOTCH 2 GND 3 CIN 4 FMS6406 8-pin SOIC © 2006 Fairchild Semiconductor Corporation FMS6406 Rev. 4.0.4 8 YOUT 7 VCC 6 CVOUT 5 COUT Pin Assignments Pin# Pin Type Description 1 YIN Input Luminance (Luma) Input: In a typical system, this pin is connected to the Luma or composite video output pin from the external video encoder. 2 EQ_NOTCH Output 3 GND Input Ground 4 CIN Input Chrominance (Chroma) Input: In a typical system, this pin is connected to the Chroma output pin from the external video encoder. 5 COUT Output Filtered Chrominance Video Output from the CIN channel. 6 CVOUT Output Composite Video Output: This pin is the sum of YOUT and COUT. 7 VCC Input 8 YOUT Output Composite video output to RF modulator/driver. +5V supply. Filtered Luminance Video Output from the YIN channel. www.fairchildsemi.com FMS6406 Precision S-Video Filter with Summed Composite Output, Sound Trap, and Group Delay Compensation FMS6406 Pin Configuration The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table defines the conditions for actual device operation. Min. Max. Unit VCC Parameter -0.3 6 V Analog and Digital I/O -0.3 VCC + 0.3 V 100 mA Output Channel - Any One Channel (Do Not Exceed) Notes: Functional operation under any of these conditions is NOT implied. Performance and reliability are guaranteed only if operating conditions are not exceeded. Reliability Information Parameter Min. Typ. Junction Temperature Storage Temperature Range -65 Lead Temperature (Soldering, 10s) Thermal Resistance (qJA), JEDEC Standard Multi-layer Test Boards, Still Air Max. Unit 150 °C +150 °C 300 °C 115 °C/W Recommended Operating Conditions Parameter Min Operating Temperature Range +4.75 GND FMS6406 Rev. 4.0.4 Max Unit 70 °C +5.0 +5.25 V 0 VCC Range © 2006 Fairchild Semiconductor Corporation Typ 0 V www.fairchildsemi.com FMS6406 Precision S-Video Filter with Summed Composite Output, Sound Trap, and Group Delay Compensation Absolute Maximum Ratings Tc = 25°C, Vi = 1Vpp, VCC = 5V, all inputs AC-coupled with 0.1μF, all outputs are AC-coupled with 220μF into 150Ω, referenced to 400kHz; unless otherwise noted. Symbol Parameter Conditions ICC Supply Current1 VCC no load 50 80 110 mA AVYCCV Low Frequency Gain (YOUT, COUT, CVOUT) at 400kHz 5.8 6.0 6.2 dB AVEQ Low Frequency Gain (EQ_NOTCH)1 at 400kHz 5.7 6.0 6.4 dB Csync COUT Output Level (during Sync) 1 Sync present on YIN (after 6dB gain) 1.0 1.1 1.3 V Ysync YOUT Output Level (during Sync)1 Sync present on YIN (after 6dB gain) 0.35 0.5 V CVsync CVOUT Output Level (during Sync) Sync present on YIN (after 6dB gain) 0.35 0.5 V EQsync EQ_NOTCH Output Level (during Sync)1 Sync present on YIN (after 6dB gain) 0.35 0.5 V Settled to within 10mV 1 1 Min Typ Max Units TCLAMP Clamp Response Time (Y Channel) fFLAT Gain Flatness to 4.2MHz2 (YOUT, COUT, CVOUT) fC -3dB Bandwidth1 fSB Stopband Attenuation (YOUT, COUT, CVOUT) Vi Input Signal Dynamic Range All Channels/AC coupled 1.4 Vpp ISC Output Short Circuit Current4 (Any One Channel) Y, C, CV, EQ_NOTCH to GND 85 mA dG Differential Gain2 Y, C, CV 1.4 3 dq Differential Phase Y, C, CV 0.7 1.5 THD Output Distortion (All Channels) VOUT = 1.8Vpp at 3.58MHz 0.3 % XTALK Crosstalk (Channel-to-Channel) at 3.58MHz -50 dB PSRR PSRR (All Channels) DC 50 dB SNR SNR Y, C Channel NTC-7 weighting 4.2MHz lowpass 70 75 dB NTC-7 weighting 4.2MHz lowpass 70 75 dB NTC-7 weighting 4.2MHz lowpass 65 70 dB 112 ns 1 2 2 SNR CV Channel2 SNR EQ_NOTCH Channel 2 5 ms -0.5 0 0.5 dB Y, C, CV Channels 6.7 7.6 MHz at 27MHz 40 50 dB % ° tpd Propagation Delay (Y, C, CV) at 400kHz GD Group Delay (Y, C, CV) at 3.58MHz (NTSC) -5 0 5 ns tSKEW Skew Between YOUT and COUT2 at 1MHz -2 0 2 ns tCLGCV Chroma-Luma Gain CVOUT1 f = 3.58MHz (ref to YIN at 400kHz) 98 100 102 % tCLDCV Chroma-Luma Delay CVOUT1 f = 3.58MHz (ref to YIN at 400kHz) -10 0 10 ns GDEQ Group Delay EQ_NOTCH1 f = 3.58MHz (ref to YIN at 400kHz) -195 -180 -165 ns tCLGEQ Chroma-Luma Gain EQ_NOTCH1 f = 3.58MHz (ref to YIN at 400kHz) 95 100 105 % tCLDEQ Chroma-Luma Delay EQ_NOTCH f = 3.58MHz (ref to YIN at 400kHz) -195 -180 -165 ns dGEQ Differential Gain2 0.3 1 % dqEQ Differential Phase 0.3 0.75 % MCF Modulator Channel Flatness1,3 EQ_NOTCH from 400kHz to 3.75MHz -0.5 0 0.5 dB AVPK Gain Peaking1 EQ_NOTCH from >3.75MHz to 4.2MHz -0.5 0 0.5 dB Atten1 Notch Attenuation 11 EQ_NOTCH at 4.425MHz 14 dB Atten2 Notch Attenuation 2 1 EQ_NOTCH at 4.5MHz 20 dB Atten3 Notch Attenuation 31 EQ_NOTCH at 4.6MHz 14 dB tPASS Passband Group Delay, EQ_NOTCH f = 400kHz to f = 3MHz -35 2 1 EQ_NOTCH Channel EQ_NOTCH Channel 2 1 35 ns Notes: 1. 100% tested at 25°C. 2. Guaranteed by characterization. 3. Tested down to 400kHz, but guaranteed by design to 200kHz. 4. Sustained short circuit protection limited to 10 seconds. © 2006 Fairchild Semiconductor Corporation FMS6406 Rev. 4.0.4 www.fairchildsemi.com FMS6406 Precision S-Video Filter with Summed Composite Output, Sound Trap, and Group Delay Compensation Electrical Characteristics Tc = 25°C, Vi = 1Vpp, VCC = 5V, all inputs AC-coupled with 0.1μF, all outputs are AC-coupled with 220μF into 150Ω, referenced to 400kHz; unless otherwise noted. 10 140 120 12 0 Delay (ns) Gain (dB) -20 -30 -40 -50 Mkr Frequency Ref 400kHz 1 2 3 Gain 6dB 6.53MHz 3 -1dB BW 7.87MHz 27MHz -60 400kHz 5 10 15 1 = 8.2MHz (111.35ns) 20 25 0 400kHz 30 10 Delay (ns) Mkr Frequency Ref 400kHz 1 2 3 Gain 6dB 6.68MHz 3 -1dB BW 7.87MHz 27MHz -60 400kHz 5 10 15 80 60 40 -3dB BW -44.41dB 20 1 = 8.2MHz (111.16ns) fSB = Gain(ref) – Gain(3) = 50.41dB 20 25 0 400kHz 30 5 10 Frequency (MHz) 20 25 30 Figure 4. Group Delay vs. Frequency COUT 10 140 0 120 12 1 100 Delay (ns) -10 Gain (dB) 15 Frequency (MHz) Figure 3. Frequency Response COUT -20 Mkr Frequency Gain Ref 400kHz 6dB 1 2 3 6.53MHz 3 -1dB BW 7.72MHz 27MHz -60 400kHz 5 10 15 60 20 1 = 8.2MHz (112.84ns) 20 25 0 400kHz 30 Frequency (MHz) 5 10 15 20 25 30 Frequency (MHz) Figure 5. Frequency Response CVOUT © 2006 Fairchild Semiconductor Corporation 80 40 -3dB BW -43.49dB fSB = Gain(ref) – Gain(3) = 49.49dB FMS6406 Rev. 4.0.4 30 1 100 -20 -50 25 120 12 -10 -40 20 140 0 -30 15 Figure 2. Group Delay vs. Frequency YOUT 10 Gain (dB) 5 Frequency (MHz) Figure 1. Frequency Response YOUT -50 60 20 Frequency (MHz) -40 80 40 -3dB BW -44.66dB fSB = Gain(ref) – Gain(3) = 50.66dB -30 1 100 -10 Figure 6. Group Delay vs. Frequency CVOUT www.fairchildsemi.com FMS6406 Precision S-Video Filter with Summed Composite Output, Sound Trap, and Group Delay Compensation Typical Performance Characteristics 1500 10 5 0 -5 -10 -15 1 -20 -25 -30 -35 -40 -45 -50 1 = 4.425MHz (-16.00dB) -55 400kHz 5 10 15 1000 1 500 Delay (ns) Gain (dB) Tc = 25°C, Vi = 1Vpp, VCC = 5V, HD/N_SD = 0, RSOURCE = 37.5Ω, all inputs AC-coupled with 0.1μF, all outputs are AC-coupled with 220μF into 150Ω, referenced to 400kHz; unless otherwise noted. 0 -500 -1000 -1500 -2000 20 25 1 = 4.425MHz (198.47ns) -2500 400kHz 30 5 10 Frequency (MHz) Figure 7. Modulator vs. Frequency Response 0.2 NTSC 0.1 0 -0.1 30 NTSC 0.1 0 -0.2 Min = -0.19 Max = 0.16 ppMax = 0.34 -0.3 1st 2nd Min = -0.17 Max = 0.07 ppMax = 0.25 -0.3 3rd 4th 5th 6th 1st Figure 9. Differential Gain, MODOUT 2nd 3rd 4th 5th 6th Figure 10. Differential Phase, MODOUT -60 200 -65 150 -70 100 Delay (ns) Noise (dB) 25 -0.1 -0.2 -75 -80 -85 Group Delay @ 3.58MHz = -178ns 50 0 -50 -90 -100 -95 -150 -200 -100 0 1 2 3 4 5 0 Frequency (MHz) © 2006 Fairchild Semiconductor Corporation 1.0 2.0 3.0 4.0 4.6 Frequency (MHz) Figure 11. Noise vs. Freq. Modulator Channel FMS6406 Rev. 4.0.4 20 Figure 8. Delay Modulator Output Differential Phase (deg) Differential Gain (%) 0.2 15 Frequency (MHz) Figure 12. Group Delay vs. Frequency www.fairchildsemi.com FMS6406 Precision S-Video Filter with Summed Composite Output, Sound Trap, and Group Delay Compensation Typical Performance Characteristics Tc = 25°C, Vi = 1Vpp, VCC = 5V, HD/N_SD = 0, RSOURCE = 37.5Ω, all inputs AC-coupled with 0.1μF, all outputs are AC-coupled with 220μF into 150Ω, referenced to 400kHz; unless otherwise noted. 1.5 Differential Gain (%) 0.8 Min = -0.00 Max = 1.17 ppMax = 1.16 NTSC Differential Phase (deg) 2.0 1.0 0.5 0 -0.5 2nd 3rd 4th 5th 0.25 NTSC Differential Phase (deg) Differential Gain (%) 0.4 0.2 0 Min = -0.00 Max = 0.88 ppMax = 0.87 1st 2nd 3rd 4th 0.10 0.05 0 Min = -0.04 Max = 0.21 ppMax = 0.25 -0.10 4th 5th 6th 1st 1.5 2nd 3rd 4th 5th 6th Figure 16. Differential Phase, COUT 0.5 Min = -0.00 Max = 1.42 ppMax = 1.40 NTSC 6th NTSC -0.05 3rd 5th 0.15 Differential Phase (deg) Differential Gain (%) 2nd 0.20 Figure 15. Differential Gain, COUT 1.0 0.5 0 -0.5 0.4 0.3 NTSC Min = -0.00 Max = 0.46 ppMax = 0.46 0.2 0.1 0 -0.1 1st 2nd 3rd 4th 5th 6th 1st Figure 17. Differential Gain, CVOUT © 2006 Fairchild Semiconductor Corporation FMS6406 Rev. 4.0.4 0 Figure 14. Differential Phase, VOUT 0.8 2.0 0.2 1st 1.0 -0.4 0.4 6th Figure 13. Differential Gain, VOUT -0.2 0.6 -0.2 1st 1.2 Min = -0.01 Max = 0.59 ppMax = 0.60 NTSC 2nd 3rd 4th 5th 6th Figure 18. Differential Phase, CVOUT www.fairchildsemi.com FMS6406 Precision S-Video Filter with Summed Composite Output, Sound Trap, and Group Delay Compensation Typical Performance Characteristics -60 -50 -65 -55 -70 -60 -65 -75 Noise (dB) Noise (dB) Tc = 25°C, Vi = 1Vpp, VCC = 5V, HD/N_SD = 0, RSOURCE = 37.5Ω, all inputs AC-coupled with 0.1μF, all outputs are AC-coupled with 220μF into 150Ω, referenced to 400kHz; unless otherwise noted. -80 -85 -90 -95 -90 -100 -95 -100 -105 -110 -105 0 1.0 2.0 3.0 Frequency (MHz) 4.0 5.0 0 1.0 2.0 3.0 4.0 5.0 Frequency (MHz) Figure 19. Noise vs. Frequency YOUT Noise (dB) -70 -75 -80 -85 Figure 20. Noise vs. Frequency COUT -50 -55 -60 -65 -70 -75 -80 -85 -90 -95 -100 -105 -110 0 1.0 2.0 3.0 4.0 5.0 Frequency (MHz) Figure 21. Noise vs. Frequency CVOUT © 2006 Fairchild Semiconductor Corporation FMS6406 Rev. 4.0.4 www.fairchildsemi.com FMS6406 Precision S-Video Filter with Summed Composite Output, Sound Trap, and Group Delay Compensation Typical Performance Characteristics FMS6406 Precision S-Video Filter with Summed Composite Output, Sound Trap, and Group Delay Compensation Typical Application Diagrams 4.5MHz FM Sound FMS6406 Notch and Group Delay YIN 1 2 + Video Modulator 8 5th-Order Filter + YOUT 6 To TV + CIN 4 5 5th-Order Filter 7 To Channel 3 or 4 CVOUT to VCR 3 5V COUT Figure 22. AC-Coupled Application Diagram 4.5MHz FM Sound FMS6406 Notch and Group Delay YIN 1 2 + Video Modulator 8 5th-Order Filter + YOUT 6 To TV + CIN 4 5 5th-Order Filter 7 To Channel 3 or 4 CVOUT to VCR 3 5V COUT Figure 23. DC-Coupled Application Diagram © 2006 Fairchild Semiconductor Corporation FMS6406 Rev. 4.0.4 www.fairchildsemi.com Chrominance (C) I/O Introduction The chrominance input can be driven in the same manner as the luminance input but is typically only a 0.7Vpp signal. This product is a two channel 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 designed to have AC coupled inputs and will work equally well with either AC or DC coupled outputs. The reconstruction filters provide a 5th-order Butterworth response with group delay equalization. This provides a maximally flat response in terms of delay and amplitude. Each of the four outputs is capable of driving 2Vpp into a 75Ω load. The composite video output driver is same as the other outputs. When driving a dual load either output will still function if the other output connection is inadvertently shorted providing these loads are AC-coupled. This output is designed to drive a 600Ω load to 2Vpp, which will meet its primary intention of driving a modulator load. Layout Considerations General layout and supply bypassing play major roles in high-frequency performance and thermal characteristics. The FMS6406DEMO is a 4-layer board with a full power and ground plane. Following this layout configuration will provide the optimum performance and thermal characteristics. For optimum results, follow the steps below as a basis for high frequency layout: In most applications the input coupling capacitors are 0.1μF. The Y and C inputs typically sink 1μA of current during active video, which normally tilts a horizontal line by 2mV at the Y output. During sync, the clamp restores this leakage current by sourcing an average of 20μA over the clamp interval. Any change in the coupling capacitor values will affect the amount of tilt per line. Any reduction in tilt will come with an increase in settling time. ■ Include 1µF and 0.1µF ceramic bypass capacitors ■ Place the 1µF capacitor within 0.75 inches of the power pin Luminance (Y) I/O ■ Place the 0.1µF capacitor within 0.1 inches of the power pin The typical luma input is driven by either a low impedance source of 1Vpp or the output of a 75Ω terminated line driven by the output of a current DAC. In either case, the input must be capacitively coupled to allow the syncdetect and DC restore circuitry to operate properly. ■ For multi-layer boards, use a large ground plane to help dissipate heat ■ For 2-layer boards, use a ground plane that extends beyond the device by at least 0.5” All outputs are capable of driving 2Vpp, AC or DC-coupled, into either a single or dual video load. A single video load consists of a series 75Ω impedance matching resistor connected to a terminated 75Ω line, this presents a total of 150Ω of loading to the part. A dual load would be two of these in parallel which would present a total of 75Ω to the part. The gain of the Y, C and CV signals is 6dB with 1Vpp input levels. Even when two loads are present the driver will produce a full 2Vpp signal at its output pin. FMS6406 Rev. 4.0.4 Composite Video (CV) Output Equalizer/Notch (EQ_NOTCH) Output All channels are clamped during the sync interval to set the appropriate minimum output DC level. With this operation the effective input time constant is greatly reduced, which allows for the use of small low cost coupling capacitors. The net effect is that the input will settle to 10mV in 5ms for any DC shifts present in the input video signal. © 2006 Fairchild Semiconductor Corporation Since the chrominance signal doesn’t contain any DC content, the output signal can be AC coupled using as small as a 0.1μF capacitor if DC-coupling is not desired. ■ Minimize all trace lengths to reduce series inductances 10 www.fairchildsemi.com FMS6406 Precision S-Video Filter with Summed Composite Output, Sound Trap, and Group Delay Compensation Functional Description FMS6406 Precision S-Video Filter with Summed Composite Output, Sound Trap, and Group Delay Compensation Mechanical Dimensions 8-Lead Outline Package (SOIC) © 2006 Fairchild Semiconductor Corporation FMS6406 Rev. 4.0.4 11 www.fairchildsemi.com The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. 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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. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD’S WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS. 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 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, or (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 significant injury to the user. 2. A critical component is 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. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Product Status Definition Advance Information Formative or In Design This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. P re l i m i n a r y First Production This datasheet contains preliminary data, and supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. No Identification Needed Full Production This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. Obsolete Not In Production This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only. Rev. I19 www.fairchildsemi.com 12 ©2006 Fairchild Semiconductor Corporation FMS6406 Precision S-Video Filter with Summed Composite Output, Sound Trap, and Group Delay Compensation TRADEMARKS