FMS6406CS

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This literature is subject to all applicable copyright laws and is not for resale in any manner. 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 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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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 ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein. 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