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| FMS6144A -- Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver December 2009 FMS6144A Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver Features Four-Channel 6 -Order 8MHz (SD) Filter Drives Single, AC- or DC-Coupled Video Loads (150) Transparent Input Clamping Supply Range: 3.3V to 5.0V AC- or DC-Coupled Inputs and Outputs Robust 9kV ESD Protection Lead-Free TSSOP 14-Pin Package th Description The FMS6144A Low-Cost Video Filter (LCVF) is intended to replace passive LC filters and drivers with a th low-cost integrated device. Four 6 -order filters provide nd rd improved image quality compared to typical 2 and 3 order passive solutions. The FMS6144A 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 section for details). The outputs can drive AC- or DC-coupled single (150) or dual (75) video loads. DC coupling the outputs removes the need for large output coupling capacitors. The input DC levels are offset approximately +280mV at the output (see the Applications section for details). Applications Cable Set-Top Boxes Satellite Set-Top Boxes DVD Players HDTV Personal Video Recorders (PVR) Video On Demand (VOD) Related Applications Notes AN-8002 - FMS6418B 4:2:2 Application Note AN-6024 - FMS6xxx Product Series Understanding Analog Video Signal Clamps, Bias, DC Restore, and AC or DC coupling Methods AN-6041 - PCB Layout Considerations for Video Filter / Drivers Ordering Information Part Number FMS6144AMTC14X Operating Temperature Range -40C to +85C Eco Status RoHS Package 14-Lead TSSOP Packing Method 2500 per Reel For Fairchild's definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. (c) 2009 Fairchild Semiconductor Corporation FMS6144A * Rev. 1.0.1 www.fairchildsemi.com FMS6144A -- Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver Block Diagram IN1 Transparent Clamp 6d B OUT1 IN2 Transparent Clamp 6d B OUT2 IN3 Transparent Clamp 6d B OUT3 IN4 Transparent Clamp 6d B OUT4 Figure 1. Block Diagram Pin Configuration Figure 2. 14-Lead TSSOP (Top View) Pin Definitions Pin# 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Name IN1 IN2 IN3 IN4 GND NA NA NA NA Vcc OUT4 OUT3 OUT2 OUT1 Type Input Input Input Input Input NA NA NA NA Input Output Output Output Output Description Video Input Channel 1 Video Input Channel 2 Video Input Channel 3 Video Input Channel 4 Device Ground Connection No Connection No Connection No Connection No Connection Positive Power Supply Filtered Output Channel 4 Filtered Output Channel 3 Filtered Output Channel 2 Filtered Output Channel 1 (c) 2009 Fairchild Semiconductor Corporation FMS6144A * Rev. 1.0.1 www.fairchildsemi.com 2 FMS6144A -- Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver Absolute Maximum Ratings 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 VCC VIO VOUT Parameter DC Supply Voltage Analog and Digital I/O Maximum Output Current, Do Not Exceed Min. -0.3 -0.3 Max. 6.0 VCC+0.3 50 Unit V V mA Electrostatic Discharge Information Symbol ESD Parameter Human Body Model, JESD22-A114 Charged Device Model, JESD22-C101 Min 9 2 Unit kV Reliability Information Symbol TJ TSTG TL JA Parameter Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 10 Seconds) Thermal Resistance, JEDEC Standard, Multilayer Test Boards, Still Air Min. -65 Typ. Max. +150 +150 +300 Unit C C C C/W 90 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 TA VCC Parameter Operating Temperature Range Supply Voltage Range Min. -40 3.14 Typ. 3.30 Max. +85 5.25 Unit C V (c) 2009 Fairchild Semiconductor Corporation FMS6144A * Rev. 1.0.1 www.fairchildsemi.com 3 FMS6144A -- Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver DC Electrical Characteristics TA=25C, VCC=3.3V, RS=37.5, all inputs are AC-coupled with 0.1uF, and all outputs are AC coupled with 220F into 150 load; unless otherwise noted. Symbol Supply VCC ICC VIN PSRR Parameter Supply Voltage Range Quiescent Supply Current (1) Conditions VS Range VS=+3.3V, No Load VS=+5.0V, No Load Referenced to GND if DC Coupled DC (all Channels) Min. 3.14 Typ. 3.30 21 25 1.4 -65 Max. 5.25 24 29 Units V mA VPP dB Video Input Voltage Range Power Supply Rejection Ratio Note: 1. 100% tested at TA=25C AC Electrical Characteristics TA=25C, VCC=3.3V, RS=37.5, all inputs are AC-coupled with 0.1uF, and all outputs are AC coupled with 220F into 150 load, unless otherwise noted. Symbol AV BW 0.1dB BW -1.0dB BW 3.0dB Att27M DG DP THD Xtalk SNR Tpd CLG CLD Parameter Channel Gain (2) Conditions Active Video Input Range = 1VPP RSOURCE=75, RL=150 RSOURCE=75, RL=150 RSOURCE=75, RL=150 RSOURCE=75, f=27MHz Active Video Input Range = 1VPP f=1.00MHz; VOUT=1.4VPP f=1.00MHz; VOUT=1.4VPP NTC-7 Weighting: 100kHz to 4.2MHz Delay from Input to Output; 100KHz to 4.5MHz 400Khz to 3.58Mhz 400Khz to 3.58Mhz Min. 5.8 Typ. 6.0 5 7 8 Max. 6.2 Units dB MHz MHz MHz dB % % dB dB ns 0.1dB Bandwidth -1.0 dB Bandwidth -3.0 dB Bandwidth Normalized Stopband Attenuation(2) Differential Gain - NTSC/PAL Total Harmonic Distortion Crosstalk (Channel to Channel) Peak Signal to RMS Noise Propagation Delay Chroma-Luma Gain(2) Chroma-Luma Delay 45 60 0.6 0.6 0.2 -65 74 90 Differential Phase - NTSC/PAL Active Video Input Range = 1VPP 95 100 7.5 105 % ns Note: 2. 100% tested at TA=25C (c) 2009 Fairchild Semiconductor Corporation FMS6144A * Rev. 1.0.1 www.fairchildsemi.com 4 FMS6144A -- Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver Typical Performance Characteristics Unless otherwise noted, TA = 25C, VCC = 2.7V, RS = 37.5, and AC-coupled output into 150 load. Figure 3. Delay vs. Frequency Figure 4. Frequency Response (c) 2009 Fairchild Semiconductor Corporation FMS6144A * Rev. 1.0.1 www.fairchildsemi.com 5 FMS6144A -- Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver Typical Performance Characteristics Unless otherwise noted, TA = 25C, VCC = 2.7V, RS = 37.5, and AC-coupled output into 150 load. Figure 5. Frequency Response Flatness Figure 6. Noise vs. Frequency (c) 2009 Fairchild Semiconductor Corporation FMS6144A * Rev. 1.0.1 www.fairchildsemi.com 6 FMS6144A -- Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver Typical Performance Characteristics Unless otherwise noted, TA = 25C, VCC = 2.7V, RS = 37.5, and AC-coupled output into 150 load. Figure 9. Differential Gain Figure 10. Differential Phase Figure 11. (c) 2009 Fairchild Semiconductor Corporation FMS6144A * Rev. 1.0.1 Chroma / Luma Gain & Delay www.fairchildsemi.com 7 FMS6144A -- Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver Applications Information The following circuit may be used for direct DC-coupled drive by DACs with an output voltage range of 0V to 1.4VPP. V_DAC U4-4 BCM7401B0 75 75 75 75 75 75 Video DAC Interface R366 D17 562_1% VDAC0_RBIAS VDAC0_0 VDAC0_1 VDAC0_2 B16 VDAC_LUMA A17 VDAC_CHROMA A16 VDAC_COMP VCC 0.1uF R371 E17 562_1% VDAC1_RBIAS VDAC1_0 VDAC1_1 VDAC1_2 B18 VDAC_BLUE B17 VDAC_GREEN A18 VDAC_RED 0.01uF 75 Green 75 1 75 2 3 4 75 5 6 75 7 IN1 IN2 IN3 IN4 GND NC1 NC2 OUT1 OUT2 OUT3 OUT4 VCC NC4 NC3 14 75 13 12 75 11 10 75 9 8 220uF + 75 Blue 220uF + 75 Red 220uF + 75 CVBS 220uF + 75 Figure 12. Typical Application (c) 2009 Fairchild Semiconductor Corporation FMS6144A * Rev. 1.0.1 www.fairchildsemi.com 8 FMS6144A -- Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver Application Information Application Circuits The FMS6144A 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 13: 1.0 -> 1.02V 0.65 -> 0.67V 0.3 -> 0.32V 0.0 -> 0.02V 0.65 V 75 Video Cables LOAD2 (optional) 75 YIN Driver YOUT LOAD1 75 Video Cables 75 Figure 14. Input Clamp Circuit I/O Configurations V IN For a DC-coupled DAC drive with DC-coupled outputs, use the configurationin Figure 15. Driven by: DC-Coupled DAC Outputs AC-Coupled and Clamped Y, CV, R, G, B 2.28V 1.58V 0.88V 0.28V V OUT 0V - 1.4V DVD or STB SoC DAC Output LCVF Clamp Inactive 75W There is a 280mV offset from the DC input level to the DC output level. V OUT = 2 * V IN + 280mV. Figure 15. DC-Coupled Inputs and Outputs 0.85V 0.5V 0.15V V IN 0V - 1.4V Alternatively, 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 follows: 1.98V 1.28V 0.58V V OUT Driven by: AC-Coupled and Biased U, V, Pb, Pr, C DVD or STB SoC DAC Output 0.1 LCVF Clamp Active 75 Figure 13. Typical Voltage Levels The FMS6144A 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 outputs to directly drive the FMS6144A without an AC-coupling capacitor. When the input is AC coupled, the diode clamp sets the sync tip (or lowest voltage) just below ground. The worst-case sync tip compression due to the clamp cannot exceed 7mV. The input level set by the clamp, combined with the internal DC offset, keeps the output within its acceptable range. For symmetric signals like Chroma, U, V, 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 14. Figure 16. AC-Coupled Inputs, DC-Coupled Outputs When FMS6144A is driven by an unknown external source or a SCART switch with its own clamping circuitry, the inputs should be AC coupled like Figure 17. 0V - 1.4V External video source must be AC coupled 0.1 LCVF Clamp Active 75 75 Figure 17. SCART with DC-Coupled Outputs (c) 2009 Fairchild Semiconductor Corporation FMS6144A * Rev. 1.0.1 www.fairchildsemi.com 9 FMS6144A -- Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver 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 800k 20%, so the external resistance should be 7.5M to set the DC level to 500mV. External video source must be AC coupled 7.5M NOTE: The video tilt or line time distortion is dominated by the AC-coupling capacitor. The value may need to be increased beyond 220F to obtain satisfactory operation in some applications. Power Dissipation 0.1 LCVF Bias Input 75 75 500mV +/-350mV The 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 power dissipation and internal temperature rise. TJ = TA + PD * JA where: PD = PCH1 + PCH2 + PCH3 and PCHX = VCC * ICH - (VO /RL) where: VO = 2VIN + 0.280V ICH = (ICC/3) + (VO/RL) VIN = RMS value of input signal ICC = 19mA VCC = 3.3V. RL = channel load resistance Board layout can also affect thermal characteristics. Refer to the Layout Considerations section for details. 2 (1) (2) (3) (4) (5) Figure 18. Biased SCART with DC-Coupled Outputs The same circuits can be used with AC-coupled outputs if desired. 0V - 1.4V DVD or STB SoC DAC Output 0.1 LCVF Clamp Active 75 220 Figure 19. DC-Coupled Inputs, AC-Coupled Outputs 0V - 1.4V DVD or STB SoC DAC Output 0.1 LCVF Clamp Active 75 220 The FMS6144A is specified to operate with output currents typically less than 50mA, more than sufficient for a dual (75) video load. Internal amplifiers are current limited to a maximum of 100mA and should withstand brief-duration short-circuit conditions. This capability is not guaranteed. Figure 20. AC-Coupled Inputs and Outputs External video source must be AC coupled 0V - 1.4V 0.1 LCVF Clamp Active 75 220 75 Figure 21. Biased SCART with AC-Coupled Outputs (c) 2009 Fairchild Semiconductor Corporation FMS6144A * Rev. 1.0.1 www.fairchildsemi.com 10 FMS6144A -- Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver Layout Considerations General layout and supply bypassing play a major role in high-frequency performance and thermal characteristics. Fairchild offers a four-layer board with full power and ground planes board to guide layout and aid device evaluation. The demo board is a four-layer board with full power and ground planes. Following this layout configuration provides optimum performance and thermal characteristics for the device. For best results, follow the steps and recommended routing rules below. The selection of the coupling capacitor is a function of the subsequent circuit input impedance and the leakage current of the input being driven. 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 output driver. The distance from the device pin to the series termination resistor should be no greater than 0.1 inches. Recommended Routing / Layout Rules Do not run analog and digital signals in parallel. Use separate analog and digital power planes to supply power. Traces should run on top of the ground plane at all times. No trace should run over ground/power splits. Avoid routing at 90-degree angles. Minimize clock and video data trace length differences. Include 10F and 0.1F ceramic power supply bypass capacitors. Place the 0.1F capacitor within 0.1 inches of the device power pin. Place the 10F capacitor within 0.75 inches of the device 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 body at least 0.5 inches on all sides. Include a metal paddle under the device on the top layer. Minimize all trace lengths to reduce series inductance. Thermal Considerations Since the interior of most systems, such as set-top boxes, TVs, and DVD players; are at +70C; consideration must be given to providing an adequate heat sink for the device package for maximum heat dissipation. When designing a system board, determine how much power each device dissipates. Ensure that devices of high power are not placed in the same location, such as directly above (top plane) or below (bottom plane) each other, on the PCB. PCB Thermal Layout Considerations Understand the system power requirements and environmental conditions. Maximize thermal performance of the PCB. Consider using 70m of copper for high-power designs. Make the PCB as thin as possible by reducing FR4 thickness. Use vias in power pad to tie adjacent layers together. Remember that baseline temperature is a function of board area, not copper thickness. Modeling techniques provide a first-order approximation. Output Considerations The outputs are DC offset from the input by 150mV therefore VOUT = 2 * VIN DC + 150mV. This offset is required for optimal performance from the output driver and is held at the minimum value to decrease the standing DC current into the load. Since the FMS6144A has a 2x (6dB) gain, the output is typically connected via a 75 series back-matching resistor followed by the 75 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 than 1V. When AC-coupling the output, ensure that the coupling capacitor passes the lowest frequency content in the video signal and that line time distortion (video tilt) is kept as low as possible. (c) 2009 Fairchild Semiconductor Corporation FMS6144A * Rev. 1.0.1 www.fairchildsemi.com 11 FMS6144A -- Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver Physical Dimensions 0.43 TYP 0.65 1.65 0.45 6.10 12.00TOP R0.09 min & BOTTOM A. CONFORMS TO JEDEC REGISTRATION MO-153, VARIATION AB, REF NOTE 6 B. DIMENSIONS ARE IN MILLIMETERS C. DIMENSIONS ARE EXCLUSIVE OF BURRS, MOLD FLASH, AND TIE BAR EXTRUSIONS D. DIMENSIONING AND TOLERANCES PER ANSI Y14.5M, 1982 E. LANDPATTERN STANDARD: SOP65P640X110-14M F. DRAWING FILE NAME: MTC14REV6 Figure 22. 14-Lead TSSOP 1.00 R0.09min 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/. (c) 2009 Fairchild Semiconductor Corporation FMS6144A * Rev. 1.0.1 www.fairchildsemi.com 12 FMS6144A -- Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver (c) 2009 Fairchild Semiconductor Corporation FMS6144A * Rev. 1.0.1 www.fairchildsemi.com 13 |
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