FMS6143CSX

FMS6143 Low-Cost Three-Channel 4th-Order Standard Definition Video Filter Driver Features Description ■ Three 4th-order 8MHz (SD) filters The FMS6143 Low-Cost Video Filter (LCVF) is intended to replace passive LC filters and drivers with a low-cost integrated device. Three 4th-order filters provide improved image quality compared to typical 2nd or 3rd-order passive solutions. ■ 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 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 Related Application Notes ■ Personal Video Recorders (PVR) AN-8002 — FMS6418B 4:2:2 Application Note ■ Video On Demand (VOD) AN-6024 — FMS6xxx Product Series Understanding Analog Video Signal Clamps, Bias, DCRestore, and AC or DC Coupling Methods AN-6041 — PCB Layout Considerations for Video Filter / Drivers Functional Block Diagram IN1 Transparent Clamp 6dB OUT1 IN2 Transparent Clamp 6dB OUT2 IN3 Transparent Clamp 6dB OUT3 8MHz, 4th-order Figure 1. AC-Coupled Inputs and Outputs Ordering Information Part Number Operating Temperature Range FMS6143CSX -40 to +85°C Eco Status RoHS Package Packaging Method SOIC-8 Tape and Reel For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. © 2006 Fairchild Semiconductor Corporation FMS6143 • Rev. 4.0.8 www.fairchildsemi.com FMS6143 — Low-Cost Three-Channel 4th-Order Standard Definition Video Filter Driver August 2009 FMS6143 — Low-Cost Three-Channel 4th-Order Standard Definition Video Filter Driver Pin Configuration IN1 1 IN2 2 IN3 3 VCC 4 FMS6143 8-pin SOIC 8 OUT1 7 OUT2 6 OUT3 5 GND Figure 2. AC-Coupled Inputs and Outputs Pin Assignments Pin # Name Type 1 IN1 Input Video input, Channel 1 Description 2 IN2 Input Video input, Channel 2 3 IN3 Input Video input, Channel 3 4 VCC Input +5V supply, do not float 5 GND Output Must be tied to ground, do not float 6 OUT3 Output Filtered output, Channel 3 7 OUT2 Output Filtered output, Channel 2 8 OUT1 Output Filtered output, Channel 1 © 2006 Fairchild Semiconductor Corporation FMS6143 • Rev. 4.0.8 2 www.fairchildsemi.com 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. Symbol VCC Min. Max. Unit DC Supply Voltage Parameter -0.3 6.0 V Analog and Digital I/O -0.3 VCC + 0.3 V 50 mA Output Channel - Any One Channel (Do Not Exceed) Note: 1. Functional operation under any of these conditions is NOT implied. Performance and reliability are guaranteed only if operating conditions are not exceeded. Reliability Information Symbols TJ TSTG Parameter Min. Typ. Junction Temperature Storage Temperature Range -65 TL Lead Temperature (Soldering, 10s) θJA Thermal Resistance, JEDEC Standard Multi-layer Test Boards, Still Air Max. Unit 150 °C +150 °C +300 °C 115 °C/W Electrostatic Discharge Information Symbols ESD Parameter Max. Human Body Model, JESD22-A114 6.5 Charged Device Model, JESD22-C101 2.0 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. Symbols TA VCC Parameter Min. Operating Temperature Range -40 VCC Range 4.75 © 2006 Fairchild Semiconductor Corporation FMS6143 • Rev. 4.0.8 Typ. 5.00 Max. Unit +85 °C 5.25 V www.fairchildsemi.com 3 FMS6143 — Low-Cost Three-Channel 4th-Order Standard Definition Video Filter Driver Absolute Maximum Ratings TA = 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 ICC Supply Current VIN PSRR Conditions Min. Typ. Max. Units FMS6143 (No Load) 19 Video Input Voltage Range Referenced to GND if DC-coupled 1.4 Vpp Power Supply Rejection DC (All Channels) -50 dB (1) 27 mA AC Electrical Characteristics TA = 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 Conditions AV Channel Gain(1) All Channels 6.0 6.2 f1dB -1dB Bandwidth All Channels 5.6 6.5 MHz fc fSB -3dB Bandwidth All Channels 7.7 MHz Attenuation (Stopband Reject) All Channels at f = 27MHz 48 dB DG Differential Gain All Channels 0.3 % DP Differential Phase All Channels 0.6 ° THD Output Distortion (All Channels) VOUT = 1.8Vpp, 1MHz 0.4 % XTALK Crosstalk (Channel-to-Channel) at 1MHz -60 dB SNR Signal-to-Noise Ratio 75 dB 59 ns tpd (1) Propagation Delay All Channels, NTC-7 Weighting: 100kHz to 4.2MHz Delay from Input-to-Output, 4.5MHz Min. Typ. Max. Units 6.4 dB Note: 1. 100% tested at 25°C. © 2006 Fairchild Semiconductor Corporation FMS6143 • Rev. 4.0.8 www.fairchildsemi.com 4 FMS6143 — Low-Cost Three-Channel 4th-Order Standard Definition Video Filter Driver DC Electrical Characteristics 5 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 -60 30 2 20 1 Mkr Frequency Ref 400kHz Gain 6dB 1 2 6.53MHz 7.72MHz -1dB BW -3dB BW 3 27MHz -47.13dB 400kHz 1 10 Delay (ns) Normalized Gain (dB) TA = 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. 5 10 0 -10 -20 -30 -40 -50 3 20 15 25 -60 30 1 = 8.2MHz (12.63ns) 400kHz 5 10 Frequency (MHz) Figure 3. Frequency Response 20 25 30 Figure 4. Group Delay vs. Frequency 0.2 -60 Differential Gain (%) -70 -80 Noise (dB) 15 Frequency (MHz) -90 -100 -110 -120 NTSC 0.1 0 -0.1 -0.2 Min = -0.20 Max = 0.13 ppMax = 0.33 -0.3 -130 400kHz 1 2 4 3 5 6 1st 2nd 3rd 4th 5th 6th Frequency (MHz) Figure 5. Noise vs. Frequency Differential Phase (deg) 1.0 0.8 Figure 6. Differential Gain NTSC 0.6 0.4 0.2 0 -0.2 Min = 0.00 Max = 0.59 ppMax = 0.59 -0.4 1st 2nd 3rd 4th 5th 6th Figure 7. Differential Phase © 2006 Fairchild Semiconductor Corporation FMS6143 • Rev. 4.0.8 www.fairchildsemi.com 5 FMS6143 — Low-Cost Three-Channel 4th-Order Standard Definition Video Filter Driver Typical Performance Characteristics The 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 +5V 0.1 μF 1.0 μF 1 ROUT IN1 75Ω 220μF 8 220μF 7 75Ω 220μF 6 75Ω 75Ω Video Cables R OUT1 75Ω 2 Video SoC FMS6143 8L SOIC 3 IN3 BOUT G OUT2 IN2 GOUT 75Ω B OUT3 75Ω 4 5 GND VCC DAC Load Resistors per SoC specs AC-Coupling Caps are Optional Figure 8. Typical Application Diagram © 2006 Fairchild Semiconductor Corporation FMS6143 • Rev. 4.0.8 www.fairchildsemi.com 6 FMS6143 — Low-Cost Three-Channel 4th-Order Standard Definition Video Filter Driver Typical Application Diagrams 75Ω Video Cables LOAD2 (optional) Application Circuits 75Ω 0.65V The 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: YIN Driver LOAD1 YOUT 75Ω Video Cables 75Ω Figure 10. Input Clamp Circuit 1.0 -> 1.02V I/O Configurations 0.65 -> 0.67V For a DC-coupled DAC drive with DC-coupled outputs, use this configuration: 0.3 -> 0.32V 0.0 -> 0.02V VIN 0V - 1.4V 2.28V 1.58V 0.88V 0.28V VOUT DVD or STB SoC DAC Output Driven by: DC-Coupled DAC Outputs AC-Coupled and Clamped Y, CV, R, G, B LCVF Clamp Inactive 75Ω There is a 280mV offset from the DC input level to the DC output level. VOUT = 2 * VIN + 280mV. Figure 11. DC-Coupled Inputs and Outputs 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: 0.85V 0.5V 0.15V VIN 1.98V 0V - 1.4V Driven by: AC-Coupled and Biased U, V, Pb, Pr, C 1.28V 0.58V 0.1μ DVD or STB SoC DAC Output LCVF Clamp Active 75Ω VOUT Figure 9. Typical Voltage Levels Figure 12. AC-Coupled Inputs, DC-Coupled Outputs The FMS6143 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 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. When 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 - 1.4V 0.1μ 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 10: © 2006 Fairchild Semiconductor Corporation FMS6143 • Rev. 4.0.8 LCVF Clamp Active 75Ω 75Ω Figure 13. SCART with DC-Coupled Outputs www.fairchildsemi.com 7 FMS6143 — Low-Cost Three-Channel 4th-Order Standard Definition Video Filter Driver Application Information External video source must be AC coupled 75Ω External video source must be AC coupled LCVF Clamp Active 75Ω 220μ 75Ω 7.5MΩ 0.1μ LCVF Bias Input 75Ω Figure 17. Biased SCART with AC-Coupled Outputs 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. 500mV +/-350mV Power Dissipation Figure 14. Biased SCART with DC-Coupled Outputs The FMS6143 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. The same circuits can be used with AC-coupled outputs if desired. 0V - 1.4V DVD or STB SoC DAC Output 0V - 1.4V 0.1μ 0.1μ LCVF Clamp Active 75Ω 220μ TJ = TA + Pd • θJA (1) where: Pd = PCH1 + PCH2 + PCH3 and (2) PCHx = VCC • ICH - (VO /RL) (3) where: VO = 2VIN + 0.280V (4) ICH = (ICC/3) + (VO/RL) (5) 2 VIN = RMS value of input signal Figure 15. DC-Coupled Inputs, AC-Coupled Outputs ICC = 19mA VCC = 5V RL = channel load resistance 0V - 1.4V DVD or STB SoC DAC Output 0.1μ LCVF Clamp Active 75Ω Board layout can also affect thermal characteristics. Refer to the Layout Considerations section for details. 220μ The FMS6143 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. Figure 16. AC-Coupled Inputs and Outputs © 2006 Fairchild Semiconductor Corporation FMS6143 • Rev. 4.0.8 www.fairchildsemi.com 8 FMS6143 — Low-Cost Three-Channel 4th-Order Standard Definition 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: ■ Consider using 70μm of copper for high-power designs. General layout and supply bypassing play a major role in high-frequency performance and thermal characteristics. Fairchild offers a demonstration 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 the best results, follow the steps and recommended routing rules listed below. ■ 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 FMS6143 outputs are 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 to decrease the standing DC current into the load. Since the FMS6143 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. 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 10μF and 0.1μF ceramic power supply bypass capacitors. ■ Place the 0.1μF capacitor within 0.1 inches of the device power pin. 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 output pin as possible. This 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. ■ 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. ■ 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 +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. Figure 18. Distance from Device Pin to Series Termination Resistor PCB Thermal Layout Considerations ■ Understand the system power requirements and environmental conditions. ■ Maximize thermal performance of the PCB. © 2006 Fairchild Semiconductor Corporation FMS6143 • Rev. 4.0.8 www.fairchildsemi.com 9 FMS6143 — Low-Cost Three-Channel 4th-Order Standard Definition Video Filter Driver Layout Considerations 5.00 4.80 A 0.65 3.81 5 8 B 6.20 5.80 PIN ONE INDICATOR 1.75 4.00 3.80 1 5.60 4 1.27 (0.33) 0.25 M 1.27 C B A LAND PATTERN RECOMMENDATION 0.25 0.10 SEE DETAIL A 1.75 MAX 0.25 0.19 C 0.10 0.51 0.33 0.50 x 45° 0.25 R0.10 C OPTION A - BEVEL EDGE GAGE PLANE R0.10 OPTION B - NO BEVEL EDGE 0.36 NOTES: UNLESS OTHERWISE SPECIFIED 8° 0° 0.90 0.406 A) THIS PACKAGE CONFORMS TO JEDEC MS-012, VARIATION AA, ISSUE C, B) ALL DIMENSIONS ARE IN MILLIMETERS. C) DIMENSIONS DO NOT INCLUDE MOLD FLASH OR BURRS. D) LANDPATTERN STANDARD: SOIC127P600X175-8M. E) DRAWING FILENAME: M08AREV13 SEATING PLANE (1.04) DETAIL A SCALE: 2:1 Figure 19. SOIC-8 Package 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/. © 2006 Fairchild Semiconductor Corporation FMS6143 • Rev. 4.0.8 www.fairchildsemi.com 10 FMS6143 — Low-Cost Three-Channel 4th-Order Standard Definition Video Filter Driver Physical Dimensions FMS6143 — Low-Cost Three-Channel 4th-Order Standard Definition Video Filter Driver © 2006 Fairchild Semiconductor Corporation FMS6143 • Rev. 4.0.8 www.fairchildsemi.com 11