FMS6146 Low-Cost Six-Channel 4th-Order Standard Definition Video Filter Driver Features Description ■ Six 4th-Order 8MHz (SD) Filters The FMS6146 Low-Cost Video Filter (LCVF) is intended to replace passive LC filters and drivers with a low-cost integrated device. Six 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 The FMS6146 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) 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). ■ Lead-free TSSOP-14 Package Applications ■ Cable Set-Top Boxes ■ Satellite Set-Top Boxes ■ DVD Players ■ HDTV ■ Personal Video Recorders (PVR) ■ Video On Demand (VOD) Functional Block Diagram IN1 Transparent Clamp 6dB OUT1 IN2 Transparent Clamp 6dB OUT2 IN3 Transparent Clamp 6dB OUT3 IN4 Transparent Clamp 6dB OUT4 IN5 Transparent Clamp 6dB OUT5 IN6 Transparent Clamp 6dB OUT6 8MHz, 4th order Ordering Information Part Number Operating Temperature Range FMS6146MTC14X -40°C to +85°C Eco Status RoHS Package Packaging Method TSSOP-14 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 FMS6146 • Rev. 1.1.0 www.fairchildsemi.com FMS6146 — Low-Cost Six-Channel 4th-Order Standard Definition Video Filter Driver October 2009 IN1 1 IN2 2 IN3 3 VCC 14 OUT1 13 OUT2 12 OUT3 4 11 GND IN4 5 10 OUT4 IN5 6 9 OUT5 IN6 7 8 OUT6 FMS6146 14-pin TSSOP FMS6146 — Low-Cost Six-Channel 4th-Order Standard Definition Video Filter Driver Pin Configuration Pin Assignments Pin# Pin Name Type 1 IN1 Input Video input, Channel 1 2 IN2 Input Video input, Channel 2 3 IN3 Input Video input, Channel 3 4 VCC Input +5V supply, do not float 5 IN4 Input Video input, Channel 4 6 IN5 Input Video input, Channel 5 7 IN6 Input Video input, Channel 6 8 OUT6 Output Filtered video output, Channel 6 9 OUT5 Output Filtered video output, Channel 5 10 OUT4 Output Filtered video output, Channel 4 11 GND Output Must be tied to ground, do not float 12 OUT3 Output Filtered video output, Channel 3 13 OUT2 Output Filtered video output, Channel 2 14 OUT1 Output Filtered video output, Channel 1 © 2006 Fairchild Semiconductor Corporation FMS6146 • Rev. 1.1.0 Description 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. Min. Max. Unit DC Supply Voltage Parameter -0.3 6 V Analog and Digital I/O -0.3 VCC + 0.3 V 50 mA Output Channel - Any One Channel (Do Not Exceed) 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 Multi-layer Test Boards, Still Air Max. Unit +150 °C +150 °C +300 °C 90 °C/W Electrostatic Discharge Information Symbols ESD Parameter Max. Human Body Model, JESD22-A114 4 Charged Device Model, JESD22-C101 2 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. Parameter Min. Operating Temperature Range VCC Range © 2006 Fairchild Semiconductor Corporation FMS6146 • Rev. 1.1.0 Typ. -40 +4.75 +5.0 Max. Unit +85 °C +5.25 V www.fairchildsemi.com 3 FMS6146 — Low-Cost Six-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 ICC VIN PSRR Parameter Conditions Supply Current(1) FMS6146 (No Load) Min. Typ. Max. Units Video Input Voltage Range Referenced to GND if DC coupled 1.4 Vpp Power Supply Rejection DC (All Channels) -50 dB 35 55 mA Note: 1. 100% tested at 25°C. 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 AV Channel Gain(1) Conditions f1dB fc -1dB Bandwidth -3dB Bandwidth fSB Attenuation (Stopband Reject) (1) Min. Typ. Max. Units All Channels 6.0 6.2 All Channels All Channels 4.5 6.8 7.8 MHz MHz 48 dB All Channels at f = 27MHz 6.4 dB dG Differential Gain All Channels 0.3 % dφ 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 All Channels NTC-7 Weighting: 100kHz to 4.2MHz 75 dB Propagation Delay Delay from Input-to-Output, 4.5MHz 59 ns tpd Note: 1. 100% tested at 25°C. © 2006 Fairchild Semiconductor Corporation FMS6146 • Rev. 1.1.0 www.fairchildsemi.com 4 FMS6146 — Low-Cost Six-Channel 4th-Order Standard Definition Video Filter Driver DC Electrical Characteristics 5 0 -5 -10 -15 -20 -25 -30 Mkr -35 Ref -40 1 -45 2 -50 3 -55 400kHz 40 2 30 1 20 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. Frequency 400kHz Gain 6dB 6.83MHz 7.84MHz -1dB BW -3dB BW 27MHz -47.57dB 5 10 1 10 0 -10 -20 -30 -40 3 20 15 25 1 = 8.2MHz (16.02ns) -50 400kHz 30 5 10 Frequency (MHz) Figure 1. Frequency Response 20 25 30 Figure 2. Group Delay vs. Frequency 0.2 -70 0.1 Differential Gain (%) -60 -80 Noise (dB) 15 Frequency (MHz) -90 -100 -110 -120 0 -0.1 -0.2 -0.3 -0.4 -130 NTSC Min = -0.24 Max = 0.02 ppMax = 0.26 -0.5 400kHz 1 2 4 3 5 6 1st 2nd 3rd 4th 5th 6th Frequency (MHz) Figure 3. Noise vs. Frequency Differential Phase (deg) 1.0 Figure 4. Differential Gain NTSC 0.8 0.6 0.4 0.2 0 -0.2 Min = 0.00 Max = 0.64 ppMax = 0.64 -0.4 1st 2nd 3rd 4th 5th 6th Figure 5. Differential Phase © 2006 Fairchild Semiconductor Corporation FMS6146 • Rev. 1.1.0 www.fairchildsemi.com 5 FMS6146 — Low-Cost Six-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 14 220μF 13 75Ω 220μF 12 75Ω 75Ω Video Cables R OUT1 75Ω 2 IN2 GOUT FMS6146 14L TSSOP 3 IN3 BOUT G OUT2 75Ω B OUT3 75Ω Video SoC 4 11 VCC GND 5 YOUT IN4 75Ω 220μF 10 220μF 9 75Ω 220μF 8 75Ω 75Ω Video Cables Y OUT4 75Ω 6 IN5 COUT C OUT5 75Ω 7 CVOUT IN6 CV OUT6 75Ω DAC Load Resistors per SoC specs. AC-Coupling Caps are Optional. Figure 6. Typical Application Diagram © 2006 Fairchild Semiconductor Corporation FMS6146 • Rev. 1.1.0 www.fairchildsemi.com 6 FMS6146 — Low-Cost Six-Channel 4th-Order Standard Definition Video Filter Driver Typical Application Diagrams Application Circuits 75Ω The FMS6146 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: Video Cables LOAD2 (optional) 75Ω 0.65V YIN Driver 1.0 -> 1.02V LOAD1 YOUT 75Ω Video Cables 75Ω Figure 8. 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 configuration shown in Figure 9. VIN VOUT 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 75Ω There is a 280mV offset from the DC input level to the DC output level. VOUT = 2 * VIN + 280mV. 0.85V Figure 9. DC-Coupled Inputs and Outputs 0.5V 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 shown in Figure 10. 0.15V VIN 0V - 1.4V 1.98V Driven by: AC-Coupled and Biased U, V, Pb, Pr, C 1.28V 0.58V 0.1μ DVD or STB SoC DAC Output VOUT LCVF Clamp Active 75Ω Figure 7. Typical Voltage Levels The FMS6146 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 FMS6146 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 10. AC-Coupled Inputs, DC-Coupled Outputs When the FMS6146 is driven by an unknown external source or a SCART switch with its own clamping circuitry, the inputs should be AC coupled as shown in Figure 11. 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 8. LCVF Clamp Active 75Ω 75Ω Figure 11. SCART with DC-Coupled Outputs © 2006 Fairchild Semiconductor Corporation FMS6146 • Rev. 1.1.0 www.fairchildsemi.com 7 FMS6146 — Low-Cost Six-Channel 4th-Order Standard Definition Video Filter Driver Application Information External video source must be AC-Coupled 0V - 1.4V 0.1μ LCVF Clamp Active 75Ω 220μ 75Ω External video source must be AC-coupled 75Ω 7.5MΩ 0.1μ LCVF Bias Input 75Ω Figure 15. Biased SCART with AC-Coupled Outputs 500mV +/-350mV 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. Figure 12. Biased SCART with DC-Coupled Outputs Power Dissipation The FMS6146 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 FMS6146’s 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 0.1μ LCVF Clamp Active 75Ω 220μ Tj = TA + Pd • θJA EQ. 1 where: Pd = PCH1 + PCH2 + PCH3 and EQ. 2 PCHx = VCC • ICH - (VO /RL) EQ. 3 where: VO = 2VIN + 0.280V EQ. 4 ICH = (ICC/3) + (VO/RL) EQ. 5 2 VIN = RMS value of input signal Figure 13. DC-Coupled Inputs, AC-Coupled Outputs ICC = 35mA VCC = 5V 0V - 1.4V DVD or STB SoC DAC Output 0.1μ LCVF Clamp Active 75Ω RL = channel load resistance 220μ Board layout can also affect thermal characteristics. Refer to Layout Considerations for more information. The FMS6146 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 14. AC-Coupled Inputs and Outputs © 2006 Fairchild Semiconductor Corporation FMS6146 • Rev. 1.1.0 www.fairchildsemi.com 8 FMS6146 — Low-Cost Six-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 as shown in Figure 12. Output Considerations General layout and supply bypassing play major roles in high-frequency performance and thermal characteristics. Fairchild offers a demonstration board, FMS6146DEMO, to guide layout and aid device testing and characterization. The FMS6146DEMO is a four-layer board with full power and ground planes. Following this layout configuration provides the optimum performance and thermal characteristics. For optimum results, follow the guidelines below as a basis for high-frequency layout: The FMS6146 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 FMS6146 has a 2x (6dB) gain, the output is typically connected via a 75Ωseries 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. ■ Include 1μF and 0.1μF ceramic bypass capacitors. ■ Place the 1μF capacitor within 0.75 inches of the 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. 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. Figure 16. Distance from Device Pin to Series Termination Resistor © 2006 Fairchild Semiconductor Corporation FMS6146 • Rev. 1.1.0 www.fairchildsemi.com 9 FMS6146 — Low-Cost Six-Channel 4th-Order Standard Definition Video Filter Driver Layout Considerations 0 .6 5 0 .4 3 T Y P 1 .6 5 6 .1 0 0 .4 5 1 2 .00°T O P & BOTTOM R 0.09 m in A . C O N F O R M S T O JE D E C R E G IS T R A T IO N M O -15 3, V A R IA T IO N A B , R E F N O T E 6 B . D IM E N S IO N S A R E IN M ILL IM E T E R S C . D IM E N S IO N S A R E E X C LU S IV E O F B U R R S , M O LD F LA S H , A N D T IE B A R E X T R U S IO N S D . D IM E N S IO N IN G A N D T O L E R A N C E S P E R A N S I Y 1 4 .5 M , 1 9 8 2 E . LA N D P A T T E R N S T A N D A R D : S O P 6 5P 640X 110-14M F . D R A W IN G F ILE N A M E : M T C 14 R E V 6 1 .00 R 0 .0 9m in Figure 17. TSSOP-14 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 FMS6146 • Rev. 1.1.0 www.fairchildsemi.com 10 FMS6146 — Low-Cost Six-Channel 4th-Order Standard Definition Video Filter Driver Physical Dimensions FMS6146 — Low-Cost Six-Channel 4th-Order Standard Definition Video Filter Driver © 2006 Fairchild Semiconductor Corporation FMS6146 • Rev. 1.1.0 www.fairchildsemi.com 11