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Technical content
Features
7.6MHz 5th-Order Composite Video Filter 14dB Notch at 4.425MHz to 4.6MHz for Sound Trap Capable of Handling Stereo 50dB Stopband Attenuation at 27MHz on CV Output > 0.5dB Flatness to 4.2MHz on CV Output Equalizer and Notch Filter for Driving RF Modulator with Group Delay of -180ns No External Frequency Selection Components or Clocks < 5ns Group Delay on CV Output AC-Coupled Input AC- or DC-Coupled Output Capable of PAL Frequency for CV Continuous Time Low-Pass Filters <1.4% Differential Gain with 0.7° Differential Phase on CV Channel Integrated DC Restore Circuitry with Low Tilt
Applications
Cable Set-Top Boxes Satellite Set-Top Boxes DVD Players
Description
The FMS6404 is a single composite video 5th-order Butterworth low-pass video filter optimized for minimum overshoot and flat group dela y. The device contains an audio trap that removes video information in a spectral location of the subsequent RF audio carrier. The group delay compensation circuit pre-distorts the signal to compensate for the inhere nt receiver intermediate frequency (IF) filter’s group delay distortion. In a typical application, the composite video from the DAC is AC coupled into the filter. The CV input has DC- restore circuitry to clamp the DC input levels during video synchronization. The clamp pulse is derived from the CV channel. All outputs are capable of driving 2V PP, AC- or DC- coupled, into either a single or dual video load. A single video load consists of a series 75 Ω impedance matching resistor connected to a terminated 75 Ω line. This presents a total of 150 Ω of loading to the part. A dual load would be two of these in parallel, which presents a total of 75 Ω to the part. The gain of the CV signal is 6dB with 1V PP input levels. All video channels are clamped during synchronization to establish the appropriate output voltage reference levels. Related Resources AN-6024 – FMS6xxx Product Series Understanding Analog Video Signal Clamps, Bias, DC Restore, and AC or DC coupling Methods AN-6041 – PCB Layout Considerations for Video Filter / Drivers
Ordering Information
Temperature Range Package Packing Method FMS6404CSX -40°C to +70°C 8-Lead, Small-Outline Integrated Circuit (SOIC), JEDEC MS-012, .150" Narrow Body
2500 Units
Figure 1. Block Diagram Figure 2. Pin Assignments (Top View)
1 CV In Input Composite video input
2 EQ_Notch Output Composite video output to RF modulator
3 GND Power Device ground connection
4 NC NA No connection
5 NC NA No connection
6 NC NA No connection
7 Vcc Power Device power connection
8 CV Out Output Composite video output
© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com FMS6404 • Rev. 1.0.0 3 FMS6404 — Precision Composite Video Output with Sound Trap and Group Delay Compensation Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may dam age the device. The device may not function or be operable above the recommended operating conditions and st ressing 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. Symbol Parameter Min. Max. Unit VCC DC Supply Voltage -0.3 6.0 V VIO Analog and Digital I/O -0.3 V CC+0.3 V VOUT Maximum Output Current, Do Not Exceed 100 mA Electrostatic Discharge Information Symbol Parameter Min. Unit ESD Human Body Model, JESD22-A114 8 kV Charged Device Model, JESD22-C101 2 Reliability Information Symbol Parameter Min. Typ. Max. Unit TJ Junction Temperature +150 °C TSTG Storage Temperature Range -65 +150 °C TL Lead Temperature (Soldering, 10 Seconds) +300 °C JA Thermal Resistance, JEDEC Standard, Multilayer Test Board, Still Air 90 °C/W Recommended Operating Conditions The Recommended Operating Conditions table defines th e conditions for actual device operation. Recommended operating conditions are specified to en sure optimal performance to the datash eet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. Symbol Parameter Min. Typ. Max. Unit TA Operating Temperature Range 0 +70 °C VCC Supply Voltage Range 4.75 5.00 5.25 V TA=25°C, VCC=5.0V, RS=37.5Ω, all inputs are AC-coupled with 0.1µF, and all outputs are AC coupled with 220µF into 150Ω load; unless otherwise noted. Symbol Parameter Condition Min. Typ. Max. Unit VCC Supply Voltage Range V S Range 4.75 5.00 5.25 V ICC Quiescent Supply Current V S=+5.0V, No Load 50 70 90 mA VIN Video Input Voltage Range Referenced to GND if DC Coupled 1.4 V PP PSRR Power Supply Rejection Ratio DC -50 dB ISC Output Short Circuit Current CV, EQ_NOTCH to GND 85 mA
© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com FMS6404 • Rev. 1.0.0 4 FMS6404 — Precision Composite Video Output with Sound Trap and Group Delay Compensation TA=25°C, VCC=5.0V, RS=37.5Ω, all inputs are AC-coupled with 0.1µF, and all outputs are AC coupled with 220µF into 150Ω load, unless otherwise noted. Symbol Parameter Condition Min. Typ. Max. Unit AVCV Low Frequency Gain CV OUT at 400kHz 5.8 6.0 6.2 dB AVEQ Low Frequency Gain (EQ_NOTCH) at 400kHz 5.7 6.0 6.4 dB CVsync CVOUT Output Level (During Sync) Sync Present on CVIN (After 6dB Gain) 0.35 0.50 V EQsync EQ_NOTCH Output Level (During Sync) Sync Present on CVIN (After 6dB Gain) 0.35 0.50 V tCLAMP Clamp Response Time CVOUT Settled to within 10mV 5 ms fFLAT Gain Flatness to 4.2MHz CVOUT -0.5 0 0.5 dB fC -3dB Bandwidth CV OUT Channel 6.7 7.6 MHz fSB Stopband Attenuation CVOUT at 27MHz 40 50 dB dG Differential Gain CV OUT 1.4 3.0 % dq Differential Phase CV OUT 0.7 1.5 ° THD Output Distortion V OUT=1.4Vpp at 3.58MHz 0.3 % XTALK Crosstalk V OUT=1.4Vpp at 3.58MHz -50 dB SNR SNR CV OUT Channel NTC-7 Weighting 4.2MHz Low-Pass VIN=714mV, VOUT=1.428VPP/1.010Vrms 70 75 dB SNR EQ_NOTCH Channel NTC-7 Weighting 4.2MHz Low-Pass VIN =714mV VOUT=1.428Vpp/1.010Vrms 65 70 dB tpd Propagation Delay at 400kHz 112 ns GD Group Delay CV OUT at 3.58MHz (Reference to 400KHz) -5 0 5 ns tCLGCV Chroma-Luma Gain CV OUT f=3.58MHz (Reference to 400kHz) 98 100 102 % tCLDCV Chroma-Luma Delay CV OUT f=3.58MHz (Reference to 400kHz) -10 0 10 ns tGDEQ Group Delay EQ_NOTCH f=3.58MHz (Reference to 400kHz) -195 -180 -165 ns tCLGEQ Chroma-Luma Gain EQ_NOTCH f=3.58MHz (Reference to 400kHz) 95 100 105 % tCLDEQ Chroma-Luma Delay EQ_NOTCH f=3.58MHz (Reference to 400kHz) -195 -180 -165 ns dGEQ Differential Gain EQ_NOTCH Channel 0.3 1.0 % dqEQ Differential Phase EQ_NOTCH Channel 0.30 0.75 % MCF Modulator Channel Flatness EQ_NOTCH fr om 400kHz to 3.75MHz -0.5 0 0.5 dB AVPK Gain Peaking EQ_NOTCH from >3.75MHz to 4.2MHz -0.5 0 0.5 dB Atten1 Notch Attenuation 1 EQ _NOTCH at 4.425MHz 14 dB Atten2 Notch Attenuation 2 EQ _NOTCH at 4.5MHz 20 dB Atten3 Notch Attenuation 3 EQ _NOTCH at 4.6MHz 14 dB tPASS Passband Group Delay EQ_NOTCH f=400kHz to f=3MHz -35 35 ns
steps and recommended routing rules below. Do not run analog and digital signals in parallel. Traces must run on top of the ground plane. No trace should run over ground/power splits. Avoid routing at 90-degree angles. the device on the top layer. line time distortion (video tilt) is kept as low as possible. capacitance and inductance effect on the output driver. resistor should be no greater than 2.54mm (0.1in). Figure 14. Termination Resistor Placement (bottom plane) each other on the PCB. Maximize thermal performance of the PCB. of board area, not copper thickness.
Figure 15. 8-Lead, Small-Outline Integrated Ci rcuit (SOIC), JEDEC MS-012, .150" Narrow Body warranty therein, which covers Fairchild products. B) ALL DIMENSIONS ARE IN MILLIMETERS. D) LANDPATTERN STANDARD: SOIC127P600X175-8M.
1.75 MAX
0.25 CBA
© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com FMS6404 • Rev. 1.0.0 9 FMS6404 — Precision Composite Video Output with Sound Trap and Group Delay Compensation