FMS6141

FMS6141 — Low-Cost, Single-Channel 4th-Order Standard Definition Video Filter Driver November 2006 FMS6141 Low-Cost, Single-Channel 4th-Order Standard Definition Video Filter Driver Features Single 4th-Order 8MHz (SD) Filter Drives Single, AC- or DC-coupled, Video Loads (2Vpp, 150Ω) Drives Dual, AC- or DC-coupled, Video Loads (2Vpp, 75 Ω) Transparent Input Clamping AC- or DC-Coupled Input AC- or DC-Coupled Output DC-Coupled Output Eliminates AC-Coupling Capacitors Single Supply Robust 10kV ESD Protection Lead-Free Packages: SOIC-8 or SC70-5 Description The FMS6141 Low-Cost Video Filter is intended to replace passive LC filters and drivers with a low-cost integrated device. The 4th-order filter provides improved image quality compared to typical 2nd or 3rd-order passive solutions. The FMS6141 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 an AC-coupled input is required (see Application Information for details). The FMS6141’s output can drive an AC- or DC-coupled single (150 Ω) or dual (75 Ω) load. DC-coupling the output removes the need for output coupling capacitors. The input DC level is offset approximately +280mV at the output (see Application Information for details). Related Applications Notes AN-6041 PCB Layout Considerations for Video Filter / Drivers AN-6024 FMS6xxx Product Series Understanding Analog Video Signal Clamps, Bias, DC-Restore, and AC or DC Coupling Methods Applications Cable Set-Top Boxes Satellite Set-Top Boxes DVD Players HDTVs Personal Video Recorders (PVR) Video On Demand (VOD) Functional Block Diagram VIDEOIN Transparent Clamp 2X VIDEOOUT 8MHz, 4th-order Figure 1. FMS6141 Block Diagram © 2006 Fairchild Semiconductor Corporation FMS6141 Rev. 1.0.0 www.fairchildsemi.com FMS6141 — Low-Cost, Single-Channel 4th-Order Standard Definition Video Filter Driver Ordering Information Part Number FMS6141CS FMS6141CSX FMS6141S5X Package SOIC-8 SOIC-8 SC70-5 Pb-Free Yes Yes Yes Operating Temperature Range -40°C to +85°C -40°C to +85°C -40°C to +85°C Packing Method Tube Tape and Reel Tape and Reel Pin Configurations VIN 1 N/C GND N/C 2 3 4 FMS6141 SOIC-8 8 7 6 5 VOUT VCC N/C N/C GND GND 1 2 FMS6141 SC70-5 4 VOUT 5 VCC VIN 3 Figure 2. FMS6141 SOIC-8 Figure 3. FMS6141 SC70 Pin Definitions Pin # 1 2 3 4 5 6 7 8 Name VIN N/C GND N/C N/C N/C VCC VOUT Description Video input No connect Must be connected to ground No connect No connect No connect +5V supply, do not float Filtered video output Table 2. SC70 Pin Definitions Pin# 1 2 3 4 5 Name GND GND VIN VOUT VCC Description Must be connected to ground Must be connected to ground Video input Filtered video output +5V supply, do not float Table 1. SOIC Pin Definitions © 2006 Fairchild Semiconductor Corporation FMS6141 Rev. 1.0.0 www.fairchildsemi.com 2 FMS6141 — Low-Cost, Single-Channel 4th-Order Standard Definition Video Filter Driver Absolute Maximum Ratings The “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 defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table defines the conditions for actual device operation. Parameter DC Supply Voltage Analog and Digital I/O Output Current, Do Not Exceed Min. -0.3 -0.3 Max. 6.0 VCC +0.3 50 Unit V V mA Recommended Operating Conditions Parameter Operating Temperature Range VCC Range Min. -40 4.75 Typ. 5.0 Max. 85 5.25 Unit °C V ESD Information Package Human Body Model (HBM) Charge Device Model (CDM) SOIC-8 8 2 SC70-5 10 2 Unit kV kV Reliability Information Symbol TJ TSTG TL ΘJA Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 10s) Thermal Resistance (JEDEC Standard Multi-Layer Test Boards, Still Air) SOIC-8 SC70-5 115 332 -65 Parameter Min. Typ. Max. 150 150 300 Unit °C °C °C °C/W °C/W © 2006 Fairchild Semiconductor Corporation FMS6141 Rev. 1.0.0 www.fairchildsemi.com 3 FMS6141 — Low-Cost, Single-Channel 4th-Order Standard Definition Video Filter Driver DC Specifications TA = 25°C, VCC = 5.0V, RS = 37.5Ω; input is AC coupled with 0.1µF; output is AC coupled with 220µF into a 150Ω load; unless otherwise noted. Symbol ICC VIN PSRR Parameter Supply Current (1) Conditions No load Referenced to GND if DCcoupled DC Min. Typ. 7 1.4 40 Max. 12 Unit mA Vpp dB Video Input Voltage Range Power Supply Rejection Ratio Note: 1. 100% tested at 25°C. AC Electrical Specifications TA = 25°C, VCC = 5.0V, RS = 37.5Ω; input is AC coupled with 0.1µF; output is AC coupled with 220µF into a 150Ω load; unless otherwise noted. Symbol AV f1dB fC fSB dG dφ THD SNR tpd Parameter Channel Gain (1) (1) Conditions Min. 5.6 4.0 Typ. 6.0 6.5 7.7 42 0.4 0.4 Max. 6.4 Unit dB MHz MHz dB % ° % dB ns -1dB Bandwidth -3dB Bandwidth Attenuation (Stopband Reject) Differential Gain Differential Phase Output Distortion (all channels) Signal-to-Noise Ratio Propagation Delay f = 27MHz VOUT = 1.8Vpp, 1MHz NTC-7 weighting; 100kHz to 4.2MHz Delay from input to output, 4.5MHz 0.4 75 55 Note: 1. 100% tested at 25°C. © 2006 Fairchild Semiconductor Corporation FMS6141 Rev. 1.0.0 www.fairchildsemi.com 4 FMS6141 — Low-Cost, Single-Channel 4th-Order Standard Definition Video Filter Driver Application Information Input Considerations The FMS6141 Low-Cost Video Filter provides 6dB (2X) gain from input to output. The device provides an internal diode clamp to support AC-coupled input signals. In this configuration, a 0.1µF ceramic capacitor is used to AC couple the input signal. If the input signal does not go below ground, the clamp is inactive; but if the input signal goes below ground, the clamp circuitry sets the bottom of the sync tip (or lowest voltage) to just below ground. The input level set by the clamp, combined with the internal DC offset, keeps the output signal within an acceptable range. This clamp feature also allows the FMS6141’s input to be directly driven (DC-coupled) by a ground referenced DAC output. Figure 4 shows typical DC voltage levels for the input and output signals when driven by a DC-coupled DAC output or an AC-coupled and clamped Y, CV signal. 1.0 -> 1.02V 0.65 -> 0.67V 0.3 -> 0.32V 0.0 -> 0.02V Vin 2.28V 1.58V 0.88V 0.28V Vout Figure 4. Typical DC Voltage Levels Output Considerations The FMS6141’s output is DC offset from the input by 280mv; therefore VOUT = 2 • VIN+280mv. This offset is required to obtain optimal performance from the output driver and is held at the minimum value to decrease the standing DC current into the load. Since the FMS6141 has a 2x (6dB) gain, the output is typically connected via a 75Ω-series, back-matching resistor followed by the 75Ω video cable. Due to 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 of choice passes the lowest frequency content in the video signal and that line time distortion (video tilt) is kept as low as possible. The selection of the coupling capacitor is a function of the subsequent circuit’s 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’s output pin as possible. This greatly reduces parasitic capacitance and inductance effects on the FMS6141’s output driver. The distance from the device’s pin to the series termination resistor should be no greater than 0.1 inches, as shown in Figure 5. Figure 5. Resistor Placement © 2006 Fairchild Semiconductor Corporation FMS6141 Rev. 1.0.0 www.fairchildsemi.com 5 FMS6141 — Low-Cost, Single-Channel 4th-Order Standard Definition Video Filter Driver I/O Configurations Figure 6 shows a typical AC-coupled input configuration for driving the filter/driver. Using this configuration, a 0.1µF ceramic capacitor is used to AC couple the input signal. The coupling capacitor and the input termination resistor at the input of the filter/driver should be placed close to the input pin for optimal signal integrity. 0.1µF Input RTERM Clamp / Bias LPF Buf Termination & coupling close to device input Figure 6. Typical Input Configuration 75Ω 0.65V YOUT 75Ω Video Cables 75Ω LOAD2 (optional) 75Ω 75Ω LOAD1 YIN Driver 800 K ohms Figure 7. Conceptual Illustration — Input Clamp Circuit and Output Driver Connected to Drive Single or Dual Video Loads 0V - 1.4V DVD SoC RTERM LCVF Clamp Mode 75 Figure 8. DC-Coupled Input and DC-Coupled Output © 2006 Fairchild Semiconductor Corporation FMS6141 Rev. 1.0.0 www.fairchildsemi.com 6 FMS6141 — Low-Cost, Single-Channel 4th-Order Standard Definition Video Filter Driver 0.1µ DVD SoC RTERM 0V - 1.4V LCVF Clamp Mode 75 Figure 9. AC-Coupled Input and DC-Coupled Output 0V - 1.4V DVD SoC RTERM LCVF Clamp Mode 75 220µF Figure 10. DC-Coupled Input and AC-Coupled Output 0.1µ DVD SoC RTERM 0V - 1.4V LCVF Clamp Mode 75 220µF Figure 11. AC-Coupled Input and AC-Coupled Output © 2006 Fairchild Semiconductor Corporation FMS6141 Rev. 1.0.0 www.fairchildsemi.com 7 FMS6141 — Low-Cost, Single-Channel 4th-Order Standard Definition Video Filter Driver Layout Considerations General layout and supply bypassing play a major role in high-frequency performance and thermal characteristics. Fairchild offers a demonstration board for the FMS6141 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 the best results, follow the steps and recommended routing rules listed below. 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) and 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 70µm 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. 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 differences. and video data trace length Modeling techniques approximation. can provide a first-order 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 multilayer boards, use a large ground plane to help dissipate heat. For two-layer boards, use a ground plane that extends beyond the device body by 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. Power Dissipation Consider the FMS6141’s output drive configuration 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 FMS6141’s power dissipation and internal temperature rise. TJ = TA + PCHANNEL ΘJA where PCHANNEL = VCC • ICH + (VO2/RL) VO = 2VIN + 0.280V ICH = ICC + (VO/RL) VIN = RMS value of input signal ICC = 7mA VS = 5V RL = channel load resistance The FMS6141 is specified to operate with output currents typically less than 50mA, which is more than sufficient for a dual (75Ω) video load. The internal amplifiers of the FMS6141 are current limited to a maximum of 100mA and can withstand a brief-duration short-circuit condition, but this capability is not guaranteed. 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 © 2006 Fairchild Semiconductor Corporation FMS6141 Rev. 1.0.0 www.fairchildsemi.com 8 FMS6141 — Low-Cost, Single-Channel 4th-Order Standard Definition Video Filter Driver Physical Dimensions Dimensions are in millimeters unless otherwise noted. Figure 12. SOIC-8 Package © 2006 Fairchild Semiconductor Corporation FMS6141 Rev. 1.0.0 www.fairchildsemi.com 9 FMS6141 — Low-Cost, Single-Channel 4th-Order Standard Definition Video Filter Driver Physical Dimensions (Continued) Dimensions are in millimeters unless otherwise noted. Figure 13. SC70-5 Package © 2006 Fairchild Semiconductor Corporation FMS6141 Rev. 1.0.0 www.fairchildsemi.com 10 FMS6141 — Low-Cost, Single-Channel 4th-Order Standard Definition Video Filter Driver TRADEMARKS 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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FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD’S WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in 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 Advance Information Product Status Formative or In Design First Production Definition This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. This datasheet contains preliminary data; supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design. This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design. This datasheet contains specifications on a product that has been discontinued by Fairchild Semiconductor. The datasheet is printed for reference information only. Rev. I21 Preliminary No Identification Needed Full Production Obsolete Not In Production © 2006 Fairchild Semiconductor Corporation FMS6141 Rev. 1.0.0 www.fairchildsemi.com 11