FMS6144A Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver Features Description th Four-Channel 6 -Order 8MHz (SD) Filter Drives Single, AC- or DC-Coupled Video Loads (150Ω) 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 Applications 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 (150Ω) or dual (75Ω) 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). 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 Operating Temperature Range FMS6144AMTC14X -40°C to +85°C Eco Status RoHS Package Packing Method 14-Lead TSSOP 2500 per Reel For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. © 2009 Fairchild Semiconductor Corporation FMS6144A • Rev. 1.0.1 www.fairchildsemi.com FMS6144A — Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver December 2009 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) FMS6144A — Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver Block Diagram Pin Definitions Pin# Name Type Description 1 IN1 Input Video Input Channel 1 2 IN2 Input Video Input Channel 2 3 IN3 Input Video Input Channel 3 4 IN4 Input Video Input Channel 4 5 GND Input 6 NA NA No Connection 7 NA NA No Connection 8 NA NA No Connection Device Ground Connection 9 NA NA 10 Vcc Input 11 OUT4 Output Filtered Output Channel 4 12 OUT3 Output Filtered Output Channel 3 13 OUT2 Output Filtered Output Channel 2 14 OUT1 Output Filtered Output Channel 1 © 2009 Fairchild Semiconductor Corporation FMS6144A • Rev. 1.0.1 No Connection Positive Power Supply 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 50 mA VOUT Maximum Output Current, Do Not Exceed Electrostatic Discharge Information Symbol ESD Parameter Min Human Body Model, JESD22-A114 9 Charged Device Model, JESD22-C101 2 Unit kV Reliability Information Symbol TJ TSTG Parameter Min. Typ. Junction Temperature Storage Temperature Range -65 TL Lead Temperature (Soldering, 10 Seconds) ΘJA Thermal Resistance, JEDEC Standard, Multilayer Test Boards, Still Air Max. Unit +150 °C +150 °C +300 °C 90 °C/W FMS6144A — Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver Absolute Maximum Ratings 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 Min. TA Operating Temperature Range -40 VCC Supply Voltage Range 3.14 © 2009 Fairchild Semiconductor Corporation FMS6144A • Rev. 1.0.1 Typ. 3.30 Max. Unit +85 °C 5.25 V www.fairchildsemi.com 3 TA=25°C, VCC=3.3V, RS=37.5Ω, all inputs are AC-coupled with 0.1uF, and all outputs are AC coupled with 220µF into 150Ω load; unless otherwise noted. Symbol Parameter Conditions Min. Typ. Max. Units 3.14 V Supply VCC Supply Voltage Range VS Range (1) 3.30 5.25 VS=+3.3V, No Load 21 24 VS=+5.0V, No Load 25 29 mA ICC Quiescent Supply Current VIN Video Input Voltage Range Referenced to GND if DC Coupled 1.4 VPP Power Supply Rejection Ratio DC (all Channels) -65 dB PSRR Note: 1. 100% tested at TA=25°C AC Electrical Characteristics TA=25°C, VCC=3.3V, RS=37.5Ω, all inputs are AC-coupled with 0.1uF, and all outputs are AC coupled with 220µF into 150Ω load, unless otherwise noted. Symbol AV Parameter Channel Gain (2) Conditions Active Video Input Range = 1VPP Min. Typ. Max. Units 5.8 6.0 6.2 dB BW 0.1dB ±0.1dB Bandwidth RSOURCE=75Ω, RL=150Ω 5 MHz BW -1.0dB -1.0 dB Bandwidth RSOURCE=75Ω, RL=150Ω 7 MHz BW 3.0dB -3.0 dB Bandwidth RSOURCE=75Ω, RL=150Ω 8 MHz Normalized Stopband Attenuation(2) RSOURCE=75Ω, f=27MHz 60 dB Differential Gain - NTSC/PAL Active Video Input Range = 1VPP 0.6 % Att27M DG DP 45 Differential Phase - NTSC/PAL Active Video Input Range = 1VPP 0.6 ° THD Total Harmonic Distortion f=1.00MHz; VOUT=1.4VPP 0.2 % Xtalk Crosstalk (Channel to Channel) f=1.00MHz; VOUT=1.4VPP -65 dB SNR Peak Signal to RMS Noise NTC-7 Weighting: 100kHz to 4.2MHz 74 dB Propagation Delay Delay from Input to Output; 100KHz to 4.5MHz 90 ns Tpd CLG Chroma-Luma Gain(2) 400Khz to 3.58Mhz CLD Chroma-Luma Delay 400Khz to 3.58Mhz 95 100 7.5 105 FMS6144A — Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver DC Electrical Characteristics % ns Note: 2. 100% tested at TA=25°C © 2009 Fairchild Semiconductor Corporation FMS6144A • Rev. 1.0.1 www.fairchildsemi.com 4 Unless otherwise noted, TA = 25°C, VCC = 2.7V, RS = 37.5Ω, and AC-coupled output into 150Ω load. © 2009 Fairchild Semiconductor Corporation FMS6144A • Rev. 1.0.1 Figure 3. Delay vs. Frequency Figure 4. Frequency Response FMS6144A — Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver Typical Performance Characteristics www.fairchildsemi.com 5 Unless otherwise noted, TA = 25°C, VCC = 2.7V, RS = 37.5Ω, and AC-coupled output into 150Ω load. Figure 5. Frequency Response Flatness Figure 6. © 2009 Fairchild Semiconductor Corporation FMS6144A • Rev. 1.0.1 FMS6144A — Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver Typical Performance Characteristics Noise vs. Frequency www.fairchildsemi.com 6 Unless otherwise noted, TA = 25°C, VCC = 2.7V, RS = 37.5Ω, and AC-coupled output into 150Ω load. Figure 9. Differential Gain Figure 10. Differential Phase Figure 11. © 2009 Fairchild Semiconductor Corporation FMS6144A • Rev. 1.0.1 FMS6144A — Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver Typical Performance Characteristics Chroma / Luma Gain & Delay www.fairchildsemi.com 7 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 VDAC0_RBIAS VDAC0_0 VDAC0_1 VDAC0_2 VDAC1_RBIAS VDAC1_0 VDAC1_1 VDAC1_2 562_1% B16 VDAC_LUMA A17 VDAC_CHROMA A16 VDAC_COMP VCC 0.1uF R371 E17 562_1% 0.01uF B18 VDAC_BLUE B17 VDAC_GREEN A18 VDAC_RED Green + 75 75 1 IN1 OUT1 220uF 75 14 Blue 75 2 3 IN2 IN3 OUT2 OUT3 13 + 75 220uF 12 75 75 75 5 IN4 OUT4 GND VCC NC1 NC4 NC2 NC3 Red 11 + 4 10 220uF 75 75 75 Figure 12. © 2009 Fairchild Semiconductor Corporation FMS6144A • Rev. 1.0.1 9 CVBS + 6 7 Typical Application 8 220uF 75 FMS6144A — Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver Applications Information www.fairchildsemi.com 8 75Ω 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: Video Cables LOAD2 (optional) 75Ω 0.65 V YIN Driver 1.0 -> 1.02V YOUT LOAD1 75Ω Video Cables 75Ω Figure 14. Input Clamp Circuit 0.65 -> 0.67V I/O Configurations 0.3 -> 0.32V 0.0 -> 0.02V 2.28V 1.58V 0.88V 0.28V For a DC-coupled DAC drive with DC-coupled outputs, use the configurationin Figure 15. V IN 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 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 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: 0.5V 0.15V V IN 0V - 1.4V 1.98V DVD or STB SoC DAC Output Driven by: AC-Coupled and Biased U, V, Pb, Pr, C 1.28V 0.58V V OUT 0.1μ LCVF Clamp Active 75Ω FMS6144A — Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver Application Information 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. 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 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. © 2009 Fairchild Semiconductor Corporation FMS6144A • Rev. 1.0.1 0.1μ LCVF Clamp Active 75Ω 75Ω Figure 17. SCART with DC-Coupled Outputs www.fairchildsemi.com 9 External video source must be AC coupled 75Ω NOTE: 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. Power Dissipation 0.1μ 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. 7.5MΩ LCVF Bias Input 75Ω 500mV +/-350mV TJ = TA + PD • θJA (1) where: PD = PCH1 + PCH2 + PCH3 Figure 18. Biased SCART with DC-Coupled Outputs (2) and The same circuits can be used with AC-coupled outputs if desired. 2 PCHX = VCC • ICH - (VO /RL) (3) where: 0V - 1.4V 0.1μ DVD or STB SoC DAC Output LCVF Clamp Active 220μ 75Ω VO = 2VIN + 0.280V (4) ICH = (ICC/3) + (VO/RL) (5) VIN = RMS value of input signal ICC = 19mA VCC = 3.3V. RL = channel load resistance Figure 19. DC-Coupled Inputs, AC-Coupled Outputs Board layout can also affect thermal characteristics. Refer to the Layout Considerations section for details. 0V - 1.4V 0.1μ DVD or STB SoC DAC Output LCVF Clamp Active The FMS6144A is specified to operate with output currents typically less than 50mA, more than sufficient for a dual (75Ω) 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. 220μ 75Ω 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 800kΩ ±20%, so the external resistance should be 7.5MΩ to set the DC level to 500mV. Figure 20. AC-Coupled Inputs and Outputs External video source must be AC coupled 0V - 1.4V 0.1μ LCVF Clamp Active 75Ω 220μ 75Ω Figure 21. Biased SCART with AC-Coupled Outputs © 2009 Fairchild Semiconductor Corporation FMS6144A • Rev. 1.0.1 www.fairchildsemi.com 10 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. 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. Recommended Routing / Layout Rules Do not run analog and digital signals in parallel. Traces should run on top of the ground plane at all times. No trace should run over ground/power splits. Include 10μF and 0.1μF ceramic power supply bypass capacitors. Place the 0.1μF capacitor within 0.1 inches of the device power pin. Place the 10μF 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. Use separate analog and digital power planes to supply power. Avoid routing at 90-degree angles. Minimize clock and video data trace length differences. Thermal Considerations Since the interior of most systems, such as set-top boxes, TVs, and DVD players; are at +70ºC; 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 Minimize all trace lengths to reduce series inductance. 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 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 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. © 2009 Fairchild Semiconductor Corporation FMS6144A • Rev. 1.0.1 Understand the system power requirements and environmental conditions. Maximize thermal performance of the PCB. 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. FMS6144A — Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver Layout Considerations Consider using 70μm of copper for high-power designs. www.fairchildsemi.com 11 0.65 0.43 TYP 1.65 6.10 0.45 12.00°TOP & BOTTOM R0.09 min 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. 1.00 FMS6144A — Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver Physical Dimensions R0.09min 14-Lead 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 FMS6144A • Rev. 1.0.1 www.fairchildsemi.com 12 FMS6144A — Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver © 2009 Fairchild Semiconductor Corporation FMS6144A • Rev. 1.0.1 www.fairchildsemi.com 13