FMS6646 Six Channel, SD/HD (1080p) Video Filter Driver Features Description Three Selectable 8/75MHz (SD/HD 1080p) Filters The FMS6646 Low Cost Video Filter (LCVF) is intended to replace passive LC filters and drivers with a low-cost integrated device. Six Butterworth filters provide improved image quality compared to typical passive solutions. The combination of low-power StandardDefinition (SD) and High-Definition (HD 1080p) filters greatly simplifies DVD video output circuitry. Three channels offer fixed SD filters, while the other three are selectable between SD and HD filters. Low-Power Three Fixed 8MHz (SD) Filters Transparent Input Clamping Single Video Load Drive (2VPP, 150Ω, AV = 6dB) AC- or DC-Coupled Inputs AC- or DC-Coupled Outputs DC-Coupled Outputs Eliminate AC-Coupling Capacitors The FMS6646 offers a fixed gain of 6dB. The FMS6646 may be directly driven by a DC-coupled DAC output or an AC-coupled signal. Internal diode clamps and bias circuitry may be used if AC-coupled inputs are required (see the Applications Information section for details). Robust Output ESD Protection: 9kV HBM Applications The outputs can drive AC- or DC-coupled single (150Ω) video loads. DC-coupling the outputs removes the need for output coupling capacitors. The input DC levels are offset approximately +280mV at the output. Cable and Satellite Set-Top Boxes DVD Players HDTV Personal Video Recorders (PVR) Video On Demand (VOD) Ordering Information Part Number Operating Temperature Range Gain Setting FMS6646MTC20X -40°C to +85°C 6dB Eco Status RoHS Package Packing Method TSSOP-20 2500 / Reel For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html Figure 1. Block Diagram © 2009 Fairchild Semiconductor Corporation FMS6646 • Rev. 1.0.1 www.fairchildsemi.com FMS6646 — Six Channel, 6th-Order SD/HD 1080p Video Filter Driver July 2009 SD IN1 1 20 SD OUT1 SD IN2 2 19 SD OUT2 SD IN3 3 18 SD OUT3 17 GND FMS6646 20L TSSOP N/C 4 VCC 5 16 GND FcSEL 6 15 N/C SD/HD IN1 7 14 SD/HD OUT1 SD/HD IN2 8 13 SD/HD OUT2 SD/HD IN3 9 12 SD/HD OUT3 N/C 10 11 N/C Figure 2. Pin Configuration Pin Definitions Pin# Name Type Description 1 SD IN1 Input SD video input, channel 1 2 SD IN2 Input SD video input, channel 2 3 SD IN3 Input SD video input, channel 3 4 N/C Input No Connection 5 VCC Input +3.3V supply 6 FcSEL Input Selects filter corner frequency for pins 7, 8, and 9: “0” = SD, “1” = PS 7 SD/HD IN1 Input Selectable SD or PS video input, channel 1 8 SD/HD IN2 Input Selectable SD or PS video input, channel 2 9 SD/HD IN3 Input Selectable SD or PS video input, channel 3 10 N/C Input No Connection 11 N/C Input No Connection 12 SD/HD OUT3 Output Filtered SD or PS video output, channel 3 13 SD/HD OUT2 Output Filtered SD or PS video output, channel 2 14 SD/HD OUT1 Output Filtered SD or PS video output, channel 1 15 N/C Input No Connection 16 GND Input Must be tied to ground Must be tied to ground 17 GND Input 18 SD OUT3 Output Filtered SD video output, channel 3 19 SD OUT2 Output Filtered SD video output, channel 2 20 SD OUT1 Output Filtered SD video output, channel 1 © 2009 Fairchild Semiconductor Corporation FMS6646 • Rev.1.0.1 FMS6646 — Low-Cost, Six-Channel Video Filter Driver for SD/HD 1080p Pin Configuration www.fairchildsemi.com 2 Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol Parameter Min. Max. Unit V VCC DC Supply Voltage -0.3 6.0 VIO Analog and Digital I/O -0.3 VCC+0.3 V IOUT Output Current, Any One Channel, Do Not Exceed 50 mA Reliability Information Symbol TJ TSTG Parameter Min. Typ. Junction Temperature Storage Temperature Range -65 TL Reflow Temperature ΘJA Thermal Resistance, JEDEC Standard Multi-Layer Test Boards, Still Air Max. Unit +150 °C +150 °C +260 °C 74 °C/W Electrostatic Discharge Information Symbol ESD Parameter Max. Human Body Model, JESD22-A114 9 Charged Device Model, JESD22-C101 2 Unit kV Recommended Operating Conditions The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. Symbol Parameter TA Operating Temperature Range VCC Supply Voltage Range Min. Typ. -40 3.135 3.30 Max. Unit +85 °C 5.25 V FMS6646 — Low-Cost, Six-Channel Video Filter Driver for SD/HD 1080p Absolute Maximum Ratings DC Electrical Characteristics Unless otherwise noted, TA=25°C, VCC=3.3V, RSOURCE=37.5Ω, inputs AC coupled with 0.1µF, all outputs AC coupled with 220µF into 150Ω loads, referenced to 400kHz. Symbol Parameter (1) ICC Supply Current VIN Video Input Voltage Range VIL Digital Input Low VIH (1) Digital Input High (1) Conditions Min. Typ. Max. Units No Load 80 95 mA Referenced to GND if DC Coupled 1.4 VPP FcSEL 0 0.8 V FcSEL 2.4 VCC V Note: 1. 100% tested at 25°C. © 2009 Fairchild Semiconductor Corporation FMS6646 • Rev.1.0.1 www.fairchildsemi.com 3 Unless otherwise noted, TA=25°C, VIN=1VPP, VCC=3.3V, RSOURCE=37.5Ω, all inputs AC coupled with 0.1µF, all outputs AC coupled with 220µF into 150Ω loads, referenced to 400kHz. Symbol Parameter Conditions AVSD Channel Gain (2) All SD Channels f01dBSD -0.1dB Flatness All SD Channels f1dBSD (2) fcSD fSBSD -1dB Flatness -3dB Bandwidth (2) Attenuation (Stopband Reject) (2) Min. Typ. Max. Units 5.8 6.0 6.2 dB 5.5 MHz All SD Channels 5.5 7.15 MHz All SD Channels 6.5 8.0 MHz All SD Channels at f=27MHz 50 60 dB DG Differential Gain All SD Channels 0.5 % DP Differential Phase All SD Channels 0.3 ° Total Harmonic Distortion, Output VOUT=1.4VPP, 3.58MHz 0.25 % Crosstalk (ch-to-ch) 1MHz -70 dB NTC-7 weighting, 100kHz to 4.2MHz 72 dB THD XTALKSD (3) SNR Signal-to-Noise Ratio tpdSD Propagation Delay Delay from input to output, 4.5MHz 90 ns CLGSD Chroma Luma Gain f=3.58MHz (refer to SDIN at 400kHz) 100 % CLDSD Chroma Luma Delay f=3.58MHz (refer to SDIN at 400kHz) 6 ns Notes: 2. 100% tested at 25°C. 3. SNR=20 • log (714mV / rms noise). High-Definition (1080p) Electrical Characteristics FMS6646 — Low-Cost, Six-Channel Video Filter Driver for SD/HD 1080p Standard-Definition (480i) Electrical Characteristics Unless otherwise noted, TA=25°C, VIN=1VPP, VCC=3.3V, RSOURCE=37.5Ω, all inputs AC coupled with 0.1µF, all outputs AC coupled with 220µF into 150Ω loads, referenced to 400kHz. Symbol Parameter AVHD Channel Gain f1dBHD -1dB Bandwidth (4) fcHD -3dB Bandwidth (4) fsbHD THD XTALKHD Conditions (4) Attenuation Stopband Reject (4) Min. Typ. Max. Units All HD Channels 5.8 6.0 6.2 All HD Channels 55 65 MHz All HD Channels 70 75 MHz All HD Channels, f=148MHz 15 dB 20 dB Total Harmonic Distortion, Output All HD Channels, VOUT=1.4VPP, 22MHz 0.2 % Crosstalk (ch-to-ch) 1MHz -72 dB Unweighted; 100kHz to 70MHz 70 dB Delay from input to output 6 ns SNR Signal-to-Noise Ratio tpdHD Propagation Delay (5) Notes: 4. 100% tested at 25°C. 5. SNR=20 • log (714mV / rms noise). © 2009 Fairchild Semiconductor Corporation FMS6646 • Rev.1.0.1 www.fairchildsemi.com 4 Figure 3. FMS6646 SD Frequency Response 0.5 0.0 Attenuation (dB) -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 -3.5 8. 1 7. 7 7. 3 6. 9 6. 5 6. 1 5. 7 5. 3 4. 9 4. 5 4. 1 3. 7 3. 3 2. 9 2. 5 2. 1 1. 7 1. 3 0. 9 0. 5 0. 1 -4.0 Frequency (MHz) Figure 4. FMS6646 — Low-Cost, Six-Channel Video Filter Driver for SD/HD 1080p Typical Performance Characteristics FMS6646 SD Frequency Response (Flatness) 5 Attenuation (dB) 0 -5 -10 -15 -20 -25 8. 2 16 .3 24 .4 32 .5 40 .6 48 .7 56 .8 64 .9 73 .0 81 .1 89 .2 97 .2 10 5. 3 11 3. 4 12 1. 5 12 9. 6 13 7. 7 14 5. 8 15 3. 9 16 2. 0 17 0. 1 17 8. 2 0. 1 -30 Frequency (MHz) Figure 5. © 2009 Fairchild Semiconductor Corporation FMS6646 • Rev.1.0.1 FMS6646 HD Frequency Response www.fairchildsemi.com 5 Figure 6. © 2009 Fairchild Semiconductor Corporation FMS6646 • Rev.1.0.1 FMS6646 HD Frequency Response (Flatness) Figure 7. Differential Gain Figure 8. Differential Phase FMS6646 — Low-Cost, Six-Channel Video Filter Driver for SD/HD 1080p Typical Performance Characteristics (Continued) www.fairchildsemi.com 6 DVD Player or STB +5V 0.1 µF Y1 OUT 1 10.0 µF SD OUT1 SD IN1 20 C OUT SD OUT2 SD IN2 75 Ω 220µF 75 Ω 220µF Y1 75 Ω Video Cable s 19 C 75 Ω 3 SD OUT3 SD IN3 18 CV 75 Ω 4 16, 17 GND N/C Video SoC 220µF 75 Ω 2 CV OUT 75 Ω 5 Vcc G/Y2 OUT B/Pb OUT R/Pr OUT 7 14 SD/HD IN1 75 Ω 75 Ω Video Cable s Y2/G 75 Ω 8 13 SD/HD IN2 75 Ω 220µF 75 Ω 220µF Pb/B SD/HD OUT2 75 Ω 9 SD/HD IN3 N/C SD/HD OUT3 12 F cSEL AC-coupling caps are optional DAC load resistors Pr/R 75 Ω 6 15 Figure 9. Typical Application © 2009 Fairchild Semiconductor Corporation FMS6646 • Rev.1.0.1 220µF SD/HD OUT1 FMS6646 — Low-Cost, Six-Channel Video Filter Driver for SD/HD 1080p Typical Application www.fairchildsemi.com 7 Functional Description The FMS6646 Low-Cost Video Filter (LCVF) provides 6dB gain from input to output. In addition, the input is slightly offset to optimize the output driver performance. The offset is held to the minimum required value to decrease the standing DC current into the load. Typical voltage levels are shown in Figure 10. 0.65V YIN Driver YOUT 1.0 -> 1.02V 800k 0.65 -> 0.67V Figure 11. Input Clamp Circuit 0.3 -> 0.32V 0.0 -> 0.02V V IN For DC-coupled DAC drive with DC-coupled outputs, use the configuration shown in Figure 12. 2.28V 1.58V 0.88V 0.28V I/O Configurations V OUT Driven by: DC-Coupled DAC Outputs AC-Coupled and Clamped Y, CV, R, G, B 0V - 1.4V DVD or STB SoC DAC Output There is a 280mV offset from the DC input level to the DC output level. VOUT = 2 • VIN + 280mV. LCVF Clamp Inactive 75Ω 0.85V Figure 12. DC-Coupled Inputs and Outputs 0.5V If the DAC’s average DC output level causes the signal to exceed the range of 0V to 1.4V, it can be AC-coupled as shown in Figure 13. 0.15V V IN 1.98V 0V - 1.4V DVD or STB SoC DAC Output Driven by: AC-Coupled and Biased U, V, Pb, Pr, C 1.28V 0.58V V OUT 0.1μF LCVF Clamp Active 75Ω FMS6646 — Low-Cost, Six-Channel Video Filter Driver for SD/HD 1080p Applications Information Figure 10. Typical Voltage Levels Figure 13. AC-Coupled Inputs, DC-Coupled Outputs The FMS6646 provides an internal diode clamp to support AC-coupled input signals. If the input signal does not go below ground, the input clamp does not operate. This allows DAC out puts to directly drive the FMS6646 without an AC coupling capacitor. The worstcase sync tip compression due to the clamp does not exceed 7mV. The input level set by the clamp, combined with the internal DC offset, keeps the output within its acceptable range. When the input is ACcoupled, the diode clamp sets the sync tip (or lowest voltage) just below ground. When the FMS6646 is driven by an unknown external source or a SCART switch with its own clamping circuitry, the inputs should be AC-coupled as shown in Figure 14. 0V - 1.4V External video source must be AC coupled LCVF Clamp Active 75Ω 75Ω For symmetric signals like C, U, V, Cb, Cr, Pb, and Pr; the average DC bias is fairly constant and the inputs can be AC-coupled with the addition of a pull-up resistor to set the DC input voltage. DAC outputs can also drive these same signals without the AC coupling capacitor. A conceptual illustration of the input clamp circuit is shown in Figure 11. © 2009 Fairchild Semiconductor Corporation FMS6646 • Rev.1.0.1 0.1μF Figure 14. SCART Configuration with DC-Coupled Outputs www.fairchildsemi.com 8 Power Dissipation The FMS6646 output drive configuration must be considered when calculating overall power dissipation. Care must be taken not to exceed the maximum die junction temperature. The following example can be used to calculate the FMS6646’s power dissipation and internal temperature rise: TJ = TA + Pd • θJA External video source must be AC coupled 75Ω 0.1μF where Pd = PCH1 + PCH2 + PCHx and 7.5MΩ LCVF Bias Input 2 PCHx = VS • ICH - (VO /RL) 75Ω where VO = 2VIN + 0.280V ICH = (ICC / 6) + (VO/RL) 500mV +/-350mV VIN = RMS value of input signal ICC = 90mA , VS = 3.3V RL = channel load resistance Figure 15. Biased SCART with DC-Coupled Outputs The same circuits can be used with AC-coupled outputs if desired, as shown in Figure 16. 0V - 1.4V DVD or STB SoC DAC Output LCVF Clamp Inactive Board layout can affect thermal characteristics. Refer to the Layout Considerations section for more information. Output Considerations 220µF 75 The FMS6646 outputs will be DC offset from the input by 150mv therefore VOUT = 2*VIN DC+150mv. This offset is required to obtain optimal performance from the output driver and is held at the minimum value in order to decrease the standing DC current into the load. Since the FMS6646 has a 2x (6dB) gain, the output is typically connected via a 75Ω series back-matching resistor followed by the 75Ω video cable. Because of the inherent divide by two of this configuration, the blanking level at the load of the video signal is always less then 1V. When AC-coupling the output ensure that the coupling capacitor of choice will pass the lowest frequency content in the video signal and that line time distortion (video tilt) is kept as low as possible. Figure 16. DC-Coupled Inputs, AC-Coupled Outputs 0V - 1.4V 0.1μF DVD or STB SoC DAC Output LCVF Clamp Active 75Ω 220μF The selection of the coupling capacitor is a function of the subsequent circuit input impedance and the leakage current of the input being driven. In order to obtain the highest quality output video signal the series termination resistor must be placed as close to the device output pin as possible. This greatly reduces the parasitic capacitance and inductance effect on the FMS6646 output driver. Recommend distance from device pin to place series termination resistor should be no greater than 0.1 inches. Figure 17. -Coupled Inputs, AC-Coupled Outputs External video source must be AC coupled. 75W 7.5MW 0.1µF LCVF Clamp Active 75W FMS6646 — Low-Cost, Six-Channel Video Filter Driver for SD/HD 1080p The same method can be used for biased signals with the addition of a pull-up resistor to make sure the clamp never operates. The internal pull-down resistance is 800kΩ±20%, so the external resistance should be 7.5MΩ to set the DC level to 500mV. If a pull-up resistance less than 7.5MΩ is desired, an external pulldown can be added such that the DC input level is set to 500mV. 220µF 500mV +/-350mV Figure 18. Biased SCART with AC-Coupled Outputs Note: 6. The video tilt or line time distortion is dominated by the AC-coupling capacitor. The value may need to be increased beyond 220μF to obtain satisfactory operation in some applications. © 2009 Fairchild Semiconductor Corporation FMS6646 • Rev.1.0.1 Figure 19. Distance from Device Pin to Series Termination Resistor www.fairchildsemi.com 9 The FMS6646DEMO is a four-layer board with a full power and ground plane. Following this layout configura-tion pro vides the optimum performance and thermal char-acteristics. For best results, follow the steps below as a basis for high-frequency layout: General layout and supply bypassing play major roles in high-frequency performance and thermal characteristics. Fairchild offers a demonstration board, FMS6646DEMO, to guide layout and aid device testing and characteriza-tion. Include 0.01μF and 0.1μF ceramic bypass capacitors. Place the 0.01μF capacitor within 0.75 inches of the power pin. Place the 0.1μF capacitor within 0.1 inches of the power pin. For multi-layer boards, use a large ground plane to help dissipate heat. For two-layer boards, use a ground plane that extends beyond the device by at least 0.5 inches. Minimize all trace lengths to reduce series inductances. © 2009 Fairchild Semiconductor Corporation FMS6646 • Rev.1.0.1 FMS6646 — Low-Cost, Six-Channel Video Filter Driver for SD/HD 1080p Layout Considerations www.fairchildsemi.com 10 FMS6646 — Low-Cost, Six-Channel Video Filter Driver for SD/HD 1080p Physical Dimensions Figure 20. 20-Lead Thin Shrink Small Outline Package (TSSOP) Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. © 2009 Fairchild Semiconductor Corporation FMS6646 • Rev.1.0.1 www.fairchildsemi.com 11 FMS6646 — Low-Cost, Six-Channel Video Filter Driver for SD/HD 1080p © 2009 Fairchild Semiconductor Corporation FMS6646 • Rev.1.0.1 www.fairchildsemi.com 12