FMS6145_06

FMS6145 Low-Cost Five-Channel 4th-Order Standard Definition Video Filter Driver December 2006 FMS6145 Low-Cost Five-Channel 4th-Order Standard Definition Video Filter Driver Features ■ Five 4th-order 8MHz (SD) filters ■ 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 TSSOP-14 package Description The FMS6145 Low-Cost Video Filter (LCVF) is intended to replace passive LC filters and drivers with a low-cost integrated device. Five 4th-order filters provide improved image quality compared to typical 2nd or 3rd-order passive solutions. The FMS6145 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 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 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 8MHz, 4th order Ordering Information Part Number FMS6145MTC14 FMS6145MTC14X Package TSSOP-14 TSSOP-14 Pb-Free Yes Yes Operating Temperture Range -40°C to +85°C -40°C to +85°C Packaging Method Tube Tape and Reel © 2006 Fairchild Semiconductor Corporation FMS6145 Rev. 2.0.4 www.fairchildsemi.com FMS6145 Low-Cost Five-Channel 4th-Order Standard Definition Video Filter Driver Pin Configuration IN1 IN2 IN3 1 2 3 4 5 6 7 14 OUT1 OUT2 FMS6145 14-pin TSSOP 13 12 11 10 9 8 OUT3 GND VCC IN4 IN5 NC OUT4 OUT5 NC Pin Assignments Pin # 1 2 3 4 5 6 7, 8 9 10 11 12 13 14 Name IN1 IN2 IN3 VCC IN4 IN5 NC OUT5 OUT4 GND OUT3 OUT2 OUT1 Type Input Input Input Input Input Input Video input, channel 1 Video input, channel 2 Video input, channel 3 +5V supply, do not float Video input, channel 4 Video input, channel 5 No Connect Output Output Output Output Output Output Filtered video output, channel 5 Filtered video output, channel 4 Description Must be tied to ground, do not float Filtered video output, channel 3 Filtered video output, channel 2 Filtered video output, channel 1 © 2006 Fairchild Semiconductor Corporation FMS6145 Rev. 2.0.4 www.fairchildsemi.com 2 FMS6145 Low-Cost Five-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. Functional operation under any of these conditions is NOT implied. Performance and reliability are guaranteed only if recommended operating conditions are not exceeded. Parameter DC Supply Voltage Analog and Digital I/O Output Channel - Any One Channel (Do Not Exceed) Min. -0.3 -0.3 Max. 6 VCC + 0.3 50 Unit V V mA Reliability Information Symbol TJ TSTSG TL θJA Parameter Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 10s) Thermal Resistance, JEDEC Standard Multi-layer Test Boards, Still Air Min. -65 Typ. Max. 150 +150 300 Unit °C °C °C °C/W 90 Recommended Operating Conditions Symbol TA VCC VCC Range Parameter Operating Temperature Range Min. -40 +4.75 Typ. +5.0 Max. +85 +5.25 Unit °C V © 2006 Fairchild Semiconductor Corporation FMS6145 Rev. 2.0.4 www.fairchildsemi.com 3 FMS6145 Low-Cost Five-Channel 4th-Order Standard Definition Video Filter Driver DC Electrical Characteristics 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 Supply Current (1) Conditions FMS6145 (No Load) Referenced to GND if DC-coupled DC (All Channels) Min. Typ. Max. Units 30 1.4 -50 46 mA Vpp dB Video Input Voltage Range Power Supply Rejection Notes: 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 AV f1dB fc fSB dG dφ THD XTALK SNR tpd Parameter Channel Gain (1) (1) Conditions All Channels All Channels All Channels All Channels at f = 27MHz All Channels All Channels VOUT = 1.8Vpp, 1MHz at 1MHz All Channels, NTC-7 Weighting: 100kHz to 4.2MHz Delay from Input-to-Output, 4.5MHz Min. Typ. Max. Units 5.6 4.5 6.0 6.7 7.9 48 0.3 0.6 0.4 -60 75 59 6.6 dB MHz MHz dB % ° % dB dB ns -1dB Bandwidth -3dB Bandwidth Attenuation (Stopband Reject) Differential Gain Differential Phase Output Distortion (All Channels) Crosstalk (Channel-to-Channel) Signal-to-Noise Ratio Propagation Delay Notes: 1.100% tested at 25°C. © 2006 Fairchild Semiconductor Corporation FMS6145 Rev. 2.0.4 www.fairchildsemi.com 4 FMS6145 Low-Cost Five-Channel 4th-Order Standard Definition Video Filter Driver Typical Performance Characteristics 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 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 -55 2 1 50 40 30 20 Normalized Gain (dB) Delay (ns) 10 0 -10 -20 -30 -40 1 Mkr Frequency Ref 400kHz 1 6.68MHz 2 7.87MHz 3 27MHz Gain 6dB -1dB BW -3dB BW -48.66dB 3 1 = 8.2MHz (14.78ns) -50 30 400kHz 5 10 15 20 25 30 400kHz 5 10 15 20 25 Frequency (MHz) Frequency (MHz) Figure 1. Frequency Response -60 -70 Figure 2. Group Delay vs. Frequency 0.2 0.1 NTSC Differential Gain (%) -80 0 -0.1 -0.2 -0.3 -0.4 -0.5 Min = -0.31 Max = 0.03 ppMax = 0.34 Noise (dB) -90 -100 -110 -120 -130 400kHz 1 2 3 4 5 6 1st 2nd 3rd 4th 5th 6th Frequency (MHz) Figure 3. Noise vs. Frequency 1.0 Figure 4. Differential Gain Differential Phase (deg) 0.8 0.6 0.4 0.2 0 -0.2 -0.4 NTSC Min = 0.00 Max = 0.63 ppMax = 0.63 1st 2nd 3rd 4th 5th 6th Figure 5. Differential Phase © 2006 Fairchild Semiconductor Corporation FMS6145 Rev. 2.0.4 www.fairchildsemi.com 5 FMS6145 Low-Cost Five-Channel 4th-Order Standard Definition Video Filter Driver Typical Application Diagrams 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 0.1 μF 1.0 μF +5V 1 ROUT 2 IN1 OUT1 14 75Ω 220μF 75Ω Video Cables R 75Ω 13 GOUT IN2 OUT2 75Ω 220μF G 75Ω 3 BOUT IN3 FMS6145 14L TSSOP OUT3 12 75Ω 220μF B 75Ω Video SoC YOUT 4 VCC GND 11 5 IN4 OUT4 10 75Ω 220μF 75Ω Video Cables Y 75Ω 6 COUT IN5 OUT5 9 75Ω 220μF C 75Ω 7 NC NC 8 DAC load resistors AC coupling caps per SoC specifications. are optional. Figure 6. Typical Application Diagram © 2006 Fairchild Semiconductor Corporation FMS6145 Rev. 2.0.4 www.fairchildsemi.com 6 FMS6145 Low-Cost Five-Channel 4th-Order Standard Definition Video Filter Driver Application Information Application Circuits The FMS6145 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 -> 1.02V 0.65 -> 0.67V 0.3 -> 0.32V 0.0 -> 0.02V VIN 0V - 1.4V 0.65V 75Ω Video Cables LOAD2 (optional) 75Ω YIN Driver LOAD1 YOUT 75Ω Video Cables 75Ω Figure 8. Input Clamp Circuit I/O Configurations For a DC-coupled DAC drive with DC-coupled outputs, use the configuration in Figure 9. 2.28V 1.58V 0.88V 0.28V VOUT Driven by: DC-Coupled DAC Outputs AC-Coupled and Clamped Y, CV, R, G, B 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. Figure 9. DC-Coupled Inputs and Outputs 0.85V 0.5V 0.15V VIN 1.98V 1.28V 0.58V VOUT 0V - 1.4V 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. Driven by: AC-Coupled and Biased U, V, Pb, Pr, C DVD or STB SoC DAC Output 0.1μ LCVF Clamp Active 75Ω Figure 7. Typical Voltage Levels The FMS6145 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 FMS6145 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. 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 Outputs When the FMS6145 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 75Ω LCVF Clamp Active 75Ω Figure 11. SCART with DC-Coupled Outputs © 2006 Fairchild Semiconductor Corporation FMS6145 Rev. 2.0.4 www.fairchildsemi.com 7 FMS6145 Low-Cost Five-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. External video source must be AC coupled External video source must be AC coupled 0V - 1.4V 0.1μ LCVF Clamp Active 75Ω 220μ 75Ω 7.5MΩ 0.1μ LCVF Bias Input 75Ω Figure 15. 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. 75Ω 500mV +/-350mV Figure 12. Biased SCART with DC-Coupled Outputs The same circuits can be used with AC-coupled outputs if desired. 0V - 1.4V 0.1μ 220μ Power Dissipation The FMS6145 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. Tj = TA + Pd • qJA where: Pd = PCH1 + PCH2 + PCH3 and PCHx = VCC • ICH - (VO /RL) 2 DVD or STB SoC DAC Output LCVF Clamp Active 75Ω EQ. 1 EQ. 2 EQ. 3 EQ. 4 EQ. 5 where: VO = 2VIN + 0.280V ICH = (ICC/3) + (VO/RL) Figure 13. DC-Coupled Inputs, AC-Coupled Outputs 0V - 1.4V VIN = RMS value of input signal ICC = 30mA VCC = 5V RL = channel load resistance DVD or STB SoC DAC Output 0.1μ LCVF Clamp Active 75Ω 220μ Board layout can also affect thermal characteristics. Refer to the Layout Considerations section for details. The FMS6145 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 Layout Considerations General layout and supply bypassing play major roles in high-frequency performance and thermal characteristics. Fairchild offers a demonstration board, FMS6145DEMO, to guide layout and aid device testing and characterization. The FMS6145DEMO 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: ■ 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. © 2006 Fairchild Semiconductor Corporation FMS6145 Rev. 2.0.4 www.fairchildsemi.com 8 FMS6145 Low-Cost Five-Channel 4th-Order Standard Definition Video Filter Driver Mechanical Dimensions Dimensions are in millimeters unless otherwise noted. Figure 16. TSSOP-14 Package © 2006 Fairchild Semiconductor Corporation FMS6145 Rev. 2.0.4 www.fairchildsemi.com 9 FMS6145 Low-Cost Five-Channel 4th-Order Standard Definition Video Filter Driver © 2006 Fairchild Semiconductor Corporation FMS6145 Rev. 2.0.4 www.fairchildsemi.com 10