FMS6143

FMS6143 Low-Cost Three-Channel 4th-Order Standard Defi nition Video Filter DriverDecember 2006FMS6143Low-Cost Three-Channel 4th-OrderStandard Defi nition Video Filter DriverFeatures■Three 4th-order 8MHz (SD) fi lters■Drives single, AC- or DC-coupled, video loads (2Vpp, 150Ω)■Drives dual, AC- or DC-coupled, video loads (2Vpp, 75Ω)■Transparent input clamping■AC- or DC-coupled inputs■AC- or DC-coupled outputs■DC-coupled outputs eliminate AC-coupling capacitors■5V only■Robust 8kV ESD protection■Lead-free SOIC-8 package DescriptionThe FMS6143 Low-Cost Video Filter (LCVF) is intended to replace passive LC fi lters and drivers with a low-cost integrated device. Three 4th-order fi lters provide improved image quality compared to typical 2nd or 3rd-order passive solutions.The FMS6143 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 APPLICATIONS section for details).The outputs can drive AC- or DC-coupled single (150Ω) or dual (75Ω) loads. DC-coupling the outputs removes the need for 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)Functional Block DiagramIN1Transparent Clamp6dBOUT1IN2Transparent Clamp6dBOUT2IN3Transparent Clamp6dBOUT38MHz, 4th-orderOrdering InformationPart NumberFMS6143CSFMS6143CSXPackageSOIC-8SOIC-8Pb-FreeYesYesOperating Temperture Range-40°C to +85°C-40°C to +85°CPackaging MethodTubeTape and Reel© 2006 Fairchild Semiconductor Corporation FMS6143 Rev. 4.0.4

www.fairchildsemi.comFMS6143 Low-Cost Three-Channel 4th-Order Standard Defi nition Video Filter DriverPin Confi gurationIN1IN2IN312348OUT1OUT2OUT3GNDFMS61438-pinSOIC765VCCPin AssignmentsPin #12345678NameIN1IN2IN3VCCGNDOUT3OUT2OUT1TypeInputInputInputInputOutputOutputOutputOutputVideo input, Channel 1Video input, Channel 2 Video input, Channel 3+5V supply, do not fl oatDescriptionMust be tied to ground, do not fl oatFiltered output, Channel 3 Filtered output, Channel 2Filtered output, Channel 1© 2006 Fairchild Semiconductor Corporation FMS6143 Rev. 4.0.4

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FMS6143 Low-Cost Three-Channel 4th-Order Standard Defi nition Video Filter DriverAbsolute Maximum RatingsThe “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 defi ned in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table defi nes the conditions for actual device operation. SymbolVCCDC Supply VoltageParameterAnalog and Digital I/OOutput Channel - Any One Channel (Do Not Exceed)Min.-0.3-0.3Max.6.0VCC + 0.350UnitVVmANotes:1. Functional operation under any of these conditions is NOT implied. Performance and reliability are guaranteed only if operating conditions are not exceeded.Reliability InformationSymbolsTJTSTGTLθJAParameterJunction TemperatureStorage Temperature RangeLead Temperature (Soldering, 10s)Thermal Resistance, JEDEC Standard Multi-layerTest Boards, Still AirMin.-65Typ.Max.150+150300Unit°C°C°C°C/W115Recommended Operating ConditionsSymbolsTAVCCVCC RangeParameterOperating Temperature RangeMin.-40+4.75Typ.+5.00Max.+85+5.25Unit°CV© 2006 Fairchild Semiconductor Corporation FMS6143 Rev. 4.0.4

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FMS6143 Low-Cost Three-Channel 4th-Order Standard Defi nition Video Filter DriverDC Electrical CharacteristicsTA = 25°C, VCC = 5V, RSOURCE = 37.5Ω; all inputs are AC-coupled with 0.1μF; all outputs are AC-coupled with 220μF into 150Ω loads; unless otherwise noted.Symbol Parameter ICCVIN Supply Current(1) Video Input Voltage Range Power Supply Rejection Conditions FMS6143 (No Load) Referenced to GND if DC-coupled DC (All Channels)Min.Typ.Max.Units191.4-5027mAVppdB PSRRAC Electrical CharacteristicsTA = 25°C, VIN = 1Vpp, VCC = 5V, RSOURCE = 37.5Ω; all inputs are AC-coupled with 0.1μF; all outputs are AC-coupled with 220μF into 150Ω loads; unless otherwise noted.Symbol Parameter AV f1dBfcfSBdGdfTHD Channel Gain(1) -1dB Bandwidth(1) -3dB Bandwidth Attenuation (Stopband Reject) Differential Gain Differential Phase Conditions All Channels All Channels All Channels All Channels at f = 27MHz All Channels All ChannelsMin.Typ.Max.Units5..56.06.57.7480.30.60.4-6075596.6dBMHzMHzdB%°%dBdBns Output Distortion (All Channels) VOUT = 1.8Vpp, 1MHz Crosstalk (Channel-to-Channel) at 1MHz Signal-to-Noise Ratio Propagation Delay All Channels, NTC-7 Weighting: 100kHz to 4.2MHz Delay from Input-to-Output, 4.5MHz XTALK SNR tpdNotes:1. 100% tested at 25°C.© 2006 Fairchild Semiconductor Corporation FMS6143 Rev. 4.0.4

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FMS6143 Low-Cost Three-Channel 4th-Order Standard Defi nition Video Filter DriverTypical Performance CharacteristicsTA = 25°C, VCC = 5V, RSOURCE = 37.5Ω; all inputs AC-coupled with 0.1μF; all outputs are AC-coupled with 220μF into 150Ω loads; unless otherwise noted.50-5-10-15-20-25-30-35-40-45-50-60213020101Normalized Gain (dB)Delay (ns)0-10-20-30-40-50 Mkr Frequency Ref 400kHz 1 6.53MHz 2 7.72MHz 3 27MHz Gain6dB -1dB BW-3dB BW-47.13dB3-60301 = 8.2MHz (12.63ns)400kHz5101520200kHz51015202530Frequency (MHz)Frequency (MHz)Figure 1. Frequency Response-60-70-80Figure 2. Group Delay vs. Frequency0.2NTSCDifferential Gain (%)0.10-0.1-0.2-0.3Noise (dB)-90-100-110-120-130400kHz123456Min = -0.20Max = 0.13ppMax = 0.331st2nd3rd4th5th6thFrequency (MHz)Figure 3. Noise vs. FrequencyFigure 4. Differential Gain1.0NTSCDifferential Phase (deg)0.80.60.40.20-0.2-0.41st2nd3rd4th5th6thMin = 0.00Max = 0.59ppMax = 0.59Figure 5. Differential Phase© 2006 Fairchild Semiconductor Corporation FMS6143 Rev. 4.0.4

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FMS6143 Low-Cost Three-Channel 4th-Order Standard Defi nition Video Filter DriverTypical Application DiagramsThe following circuit may be used for direct DC-coupled drive by DACs with an output voltage range of 0V to 1.4V. AC-coupled or DC-coupled outputs may be used with AC-coupled outputs, offering slightly lower power dissipation.DVD Player or STB+5V0.1μF1.0μF220μF75Ω Video Cables75Ω271ROUTIN1OUT1875ΩR75Ω220μF75ΩGGOUTIN2OUT2VideoSoCBOUT3IN3FMS61438L SOICOUT3675Ω220μF75ΩB4VCCGND5DAC Load Resistorsper SoC specsAC-Coupling Caps are OptionalFigure 6. Typical Application Diagram© 2006 Fairchild Semiconductor Corporation FMS6143 Rev. 4.0.4

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FMS6143 Low-Cost Three-Channel 4th-Order Standard Defi nition Video Filter DriverApplication InformationApplication CircuitsThe FMS6143 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 the diagram below: 1.0 -> 1.02V0.65 -> 0.67V0.3 -> 0.32V0.0 -> 0.02VVIN0.65VYIN75Ω Video CablesLOAD2(optional)75Ω DriverYOUTLOAD175Ω Video Cables75Ω Figure 8. Input Clamp CircuitI/O Confi gurationsFor a DC-coupled DAC drive with DC-coupled outputs, use this confi guration: 0V - 1.4V2.28V1.58V0.88V0.28VVOUTDriven by: DC-Coupled DAC OutputsAC-Coupled and ClampedY, CV, R, G, BDVD or STBSoCDACOutputLCVFClampInactive75ΩThere is a 280mV offset from the DC input level to theDC output level. VOUT = 2 * VIN + 280mV. Figure 9. DC-Coupled Inputs and Outputs0.85V0.5V0.15VVINDriven by: AC-Coupled and Biased U, V, Pb, Pr, CVOUTAlternatively, 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:0V - 1.4V LCVFClampActive75Ω1.98V1.28V0.58VDVD or STBSoCDACOutput0.1μFigure 7. Typical Voltage Levels The FMS6143 provides an internal diode clamp to sup-port 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 FMS6143 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 can not 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 8:Figure 10. AC-Coupled Inputs, DC-Coupled OutputsWhen the FMS6143 is driven by an unknown external source or a SCART switch with its own clamping circuitry, the inputs should be AC coupled like this:0V - 1.4VExternal video source must be AC coupled0.1μLCVFClampActive75Ω75ΩFigure 11. SCART with DC-Coupled Outputs© 2006 Fairchild Semiconductor Corporation FMS6143 Rev. 4.0.4

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FMS6143 Low-Cost Three-Channel 4th-Order Standard Defi nition Video Filter DriverThe 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:External video source must be AC coupledExternal video source must be AC coupled0V - 1.4V0.1μLCVFClampActive75Ω220μ75Ω0.1μ7.5MΩLCVFBiasInput75ΩFigure 15. Biased SCART with AC-Coupled OutputsNOTE: The video tilt or line time distortion is dominated by the AC-coupling capacitor. The value may need to be incre-ased beyond 220μF to obtain satisfactory operation in some applications.75Ω500mV +/-350mVFigure 12. Biased SCART with DC-Coupled OutputsThe same circuits can be used with AC-coupled outputs if desired. 0V - 1.4V0.1μ220μPower DissipationThe FMS6143 output drive confi guration 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 FMS6146’s power dissipation and internal temperature rise.Tj = TA + Pd • θJA where: Pd = PCH1 + PCH2 + PCH3 and PCHx = VCC • ICH - (VO2/RL) where: VO = 2VIN + 0.280V ICH = (ICC/3) + (VO/RL) DVD or STBSoCDACOutputLCVFClampActive75ΩEQ. 1EQ. 2EQ. 3EQ. 4EQ. 5VIN = RMS value of input signalFigure 13. DC-Coupled Inputs, AC-Coupled Outputs0V - 1.4VICC = 19mAVCC = 5VRL = channel load resistance220μDVD or STBSoCDACOutput0.1μLCVFClampActive75ΩBoard layout can also affect thermal characteristics. Refer to the Layout Considerations section for details.The FMS6143 is specifi ed to operate with output currents typically less than 50mA, more than suffi cient for a dual (75Ω) video load. Internal amplifi ers are current limited to a maximum of 100mA and should withstand brief-duration short-circuit conditions. This capability is not guaranteed.Figure 14. AC-Coupled Inputs and OutputsLayout ConsiderationsGeneral layout and supply bypassing play major roles in high-frequency performance and thermal characteristics. Fairchild offers a demonstration board, FMS6143DEMO, to use as a guide for layout and to aid in device testing and characterization. The FMS6143DEMO is a four-layer board with full power and ground planes. Following this layout confi guration provides the optimum performance and thermal characteristics. For optimum results, follow the guidelines below as a basis for high-frequency layout:© 2006 Fairchild Semiconductor Corporation FMS6143 Rev. 4.0.4

Include 1μF and 0.1μF ceramic bypass capacitors.■ Place the 1μF 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.www.fairchildsemi.com8

FMS6143 Low-Cost Three-Channel 4th-Order Standard Defi nition Video Filter DriverMechanical DimensionsDimensions are in millimeters unless otherwise noted.Figure 16. SOIC-8 Package© 2006 Fairchild Semiconductor Corporation FMS6143 Rev. 4.0.4

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FMS6143 Low-Cost Three-Channel 4th-Order Standard Defi nition Video Filter Driver© 2006 Fairchild Semiconductor Corporation

FMS6143 Rev. 4.0.4

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