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FMS6143A -- Low-Cost Three-Channel 6th-Order Standard Definition Video Filter Driver
December 2009
FMS6143A Low-Cost Three-Channel 6th-Order Standard Definition Video Filter Driver
Features
Three 6 -Order 8MHz (SD) Filter Drives Single AC- or DC-Coupled Video Loads (150) Transparent Input Clamping Single Supply: 3.3V AC- or DC-Coupled Inputs and Outputs DC-Coupled Output Eliminates AC-Coupling Capacitor Robust 8.5kV ESD Protection Supply Voltage Range: 3.3V to 5.0V Lead-Free SOIC-8 Package
th
Description
The FMS6143A Low-Cost Video Filter (LCVF) is intended to replace passive LC filters and drivers with a th low-cost integrated device. Three 6 -order filters nd provide improved image quality compared to typical 2 rd and 3 -order passive solutions. The FMS6143A 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 (150) or dual (75) video loads. DC coupling the outputs removes the need for large 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)
Related Applications Notes
AN-8002 - FMS6418B 4:2:2 Application Note 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
Part Number
FMS6143ACSX
Operating Temperature Range
-40C to +85C
Package
8-Lead, Small Outline Integrated Circuit (SOIC)
Eco Status
RoHS
Packing Method
Reel
Quantity
5000
For Fairchild's definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
(c) 2009 Fairchild Semiconductor Corporation FMS6143A * Rev. 1.0.0
www.fairchildsemi.com
FMS6143A -- Low-Cost Three-Channel 6th-Order Standard Definition Video Filter Driver
Block Diagram
IN1
Transparent Clamp
6d B
OUT1
IN2
Transparent Clamp
6d B
OUT2
IN3
Transparent Clamp
6d B
OUT3
th
Figure 1. Block Diagram
Pin Configuration
IN1 Fairchild IN2 FMS6143A IN3 8-Lead SOIC VCC
Figure 2. Pin Configuration
OUT1 OUT2 OUT3 GND
Pin Definitions
Pin #
1 2 3 4 5 6 7 8
Name
IN1 IN2 IN3 Vcc GND OUT3 OUT2 OUT1
Type
Input Input Input Input Input Output Output Output
Description
Video Input Channel 1 Video Input Channel 2 Video Input Channel 2 Positive Power Supply Device Ground Connection Filtered Output Channel 3 Filtered Output Channel 2 Filtered Output Channel 1
(c) 2009 Fairchild Semiconductor Corporation FMS6143A * Rev. 1.0.0
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FMS6143A -- Low-Cost Three-Channel 6th-Order Standard Definition Video Filter Driver
Absolute Maximum Ratings
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.
Symbol
VS VIO VOUT
Parameter
DC Supply Voltage Analog and Digital I/O Maximum Output Current, Do Not Exceed
Min.
-0.3 -0.3
Max.
6.0 VCC+0.3 50
Unit
V V mA
Electrostatic Discharge Information
Symbol
ESD
Parameter
Human Body Model, JESD22-A114 Charged Device Model, JESD22-C101
Min.
8.5 2.0
Unit
kV
Reliability Information
Symbol
TJ TSTG JA
Parameter
Junction Temperature Storage Temperature Range Thermal Resistance, JEDEC Standard, Multilayer Test Boards, Still Air
Min.
-65
Typ.
Max.
+150 +150
Unit
C C C/W
115
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.
Symbol
TA VCC
Parameter
Operating Temperature Range Supply Voltage Range
Min.
-40 3.14
Typ.
3.30
Max.
+85 5.25
Unit
C V
(c) 2009 Fairchild Semiconductor Corporation FMS6143A * Rev. 1.0.0
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FMS6143A -- Low-Cost Three-Channel 6th-Order Standard Definition Video Filter Driver
DC Electrical Characteristics
Unless otherwise noted; TA=25C, VCC=3.3V, RS=37.5; all inputs are AC coupled with 0.1F; and all outputs are AC coupled with 220F into 150 load.
Symbol
VS ICC VIN PSRR
Parameter
Supply Voltage Range Quiescent Supply Current
(1)
Conditions
VS Range VS=+3.3V, No Load VS=+5.0V, No Load Referenced to GND if DC Coupled DC (All Channels)
Min.
3.14
Typ.
3.30 15 19 1.4 -65
Max.
5.25 22 24
Units
V mA mA Vpp dB
Video Input Voltage Range Power Supply Rejection Ratio
Note: 1. 100% tested at TA=25C.
AC Electrical Characteristics
Unless otherwise noted; TA=25C, VCC=3.3V, RS=37.5; all inputs are AC coupled with 0.1F; and all outputs AC coupled with 220F into 150 load.
Symbol
AV BW 0.1dB BW -1.0dB BW 3.0dB Att27M DG DP THD Xtalk SNR tpd CLG CLD
Parameter
Channel Gain 0.1dB Bandwidth(2) -1.0 dB Bandwidth(2) -3.0 dB Bandwidth
(2)
Conditions
Active Video Input Range = 1VPP RSOURCE=75, RL=150 RSOURCE=75, RL=150 RSOURCE=75, RL=150 RSOURCE=75, f=27MHz Active Video Input Range = 1VPP f=1.00MHz; VOUT=1.4Vpp f=1.00MHz; VOUT=1.4Vpp NTC-7 Weighting: 100kHz to 4.43MHz Delay from Input to Output: 100KHz to 4.43MHz 400KHz to 3.58MHz and 4.43MHz 400KHz to 3.58MHz and 4.43MHz
Min.
5.8 6.5 7.5 45
Typ.
6.0 5.0 7.0 8.0 60 0.6 0.6 0.2 -65 74 90
Max.
6.2
Units
dB MHz MHz MHz dB % % dB dB ns
Normalized Stopband Attenuation(2) Differential Gain - NTSC/PAL Total Harmonic Distortion Crosstalk (Channel to Channel) Peak Signal to RMS Noise Propagation Delay Chroma-Luma Gain(2) Chroma-Luma Delay
Differential Phase - NTSC/PAL Active Video Input Range = 1VPP
95
100 5.0
105
% ns
Note: 2. 100% tested at TA=25C.
(c) 2009 Fairchild Semiconductor Corporation FMS6143A * Rev. 1.0.0
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FMS6143A -- Low-Cost Three-Channel 6th-Order Standard Definition Video Filter Driver
Typical Performance Characteristics
Unless otherwise noted, TA = 25C, VCC = 3.3V, RS = 37.5, and AC-coupled output into 150 load.
Figure 3.
Frequency Response
Figure 4.
Frequency Response Flatness
(c) 2009 Fairchild Semiconductor Corporation FMS6143A * Rev. 1.0.0
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FMS6143A -- Low-Cost Three-Channel 6th-Order Standard Definition Video Filter Driver
Typical Performance Characteristics
Unless otherwise noted, TA = 25C, VCC = 3.3V, RS = 37.5, and AC-coupled output into 150 load.
Figure 5.
Delay vs. Frequecny
Figure 6.
Noise vs. Frequecny
(c) 2009 Fairchild Semiconductor Corporation FMS6143A * Rev. 1.0.0
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FMS6143A -- Low-Cost Three-Channel 6th-Order Standard Definition Video Filter Driver
Typical Performance Characteristics
Unless otherwise noted, TA = 25C, VCC = 3.3V, RS = 37.5, and AC-coupled output into 150 load.
Figure 7.
Differential Gain
Figure 8.
Differential Phase
Figure 9.
(c) 2009 Fairchild Semiconductor Corporation FMS6143A * Rev. 1.0.0
Chroma / Luma Gain & Delay
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FMS6143A -- Low-Cost Three-Channel 6th-Order Standard Definition Video Filter Driver
Applications Information
DVD Player or STB
0.1 uF 1.0 uF 75 220uF 75 Video Cables 75
7
+5V
1 YOUT 2 Pb/COUT
IN1
OUT1
8
Y
75
220uF 75
Pb/C
Video SoC
Pr/CVOUT
IN2
3
OUT2
FAIRCHILD FMS6143 8L SOIC
IN3
OUT3
6
75
220uF 75
Pr/CV
4 VCC GND
5
DAC Load Resistors per SoC specs.
AC-Coupling Caps are Optional.
Figure 10.
Typical Application
(c) 2009 Fairchild Semiconductor Corporation FMS6143A * Rev. 1.0.0
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FMS6143A -- Low-Cost Three-Channel 6th-Order Standard Definition Video Filter Driver
Application Information
Application Circuits
The FMS6143A 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 Figure 11.
1.0 -> 1.02V 0.65 -> 0.67V 0.3 -> 0.32V 0.0 -> 0.02V
0.65 V
75
Video Cables
LOAD2 (optional)
75
YIN
Driver
YOUT
LOAD1
75
Video Cables
75
Figure 12. Input Clamp Circuit
I/O Configurations
V IN
For a DC-coupled DAC drive with DC-coupled outputs, use this configuration:
Driven by: DC-Coupled DAC Outputs AC-Coupled and Clamped Y, CV, R, G, B
2.28V 1.58V 0.88V 0.28V V OUT
0V - 1.4V
DVD or STB SoC DAC Output
LCVF Clamp Inactive
75W
There is a 280mV offset from the DC input level to the DC output level. V OUT = 2 * V IN + 280mV.
Figure 13. DC-Coupled Inputs and Outputs
0.85V 0.5V 0.15V V IN
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:
1.98V 1.28V 0.58V V OUT
Driven by: AC-Coupled and Biased U, V, Pb, Pr, C
DVD or STB SoC DAC Output
0.1
LCVF Clamp Active
75
Figure 11. Typical Voltage Levels The FMS6143A 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 FMS6143A 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 12. Figure 14. AC-Coupled Inputs, DC-Coupled Outputs When the FMS6143A 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 15.
0V - 1.4V
External video source must be AC coupled
0.1
LCVF Clamp Active
75
75
Figure 15. SCART with DC-Coupled Outputs
(c) 2009 Fairchild Semiconductor Corporation FMS6143A * Rev. 1.0.0
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FMS6143A -- Low-Cost Three-Channel 6th-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 800k 20%, so the external resistance should be 7.5M to set the DC level to 500mV:
External video source must be AC coupled
External video source must be AC coupled
0V - 1.4V 0.1
LCVF Clamp Active
75
220
75
0.1
7.5M
LCVF Bias Input
75
Figure 19. 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 220F to obtain satisfactory operation in some applications.
75
500mV +/-350mV
Figure 16. Biased SCART with DC-Coupled Outputs
Power Dissipation
The same circuits can be used with AC-coupled outputs if desired.
0V - 1.4V
DVD or STB SoC DAC Output
0.1
LCVF Clamp Active
75
220
The FMS6143A 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: TJ = TA + PD * JA where: PD = PCH1 + PCH2 + PCH3 and PCHX = VCC * ICH - (VO /RL) where: VO = 2VIN + 0.280V ICH = (ICC/3) + (VO/RL) VIN = RMS value of input signal ICC = 15mA VCC = 3.3V
2
(1) (2) (3) (4) (5)
Figure 17. DC-Coupled Inputs, AC-Coupled Outputs
0V - 1.4V
DVD or STB SoC DAC Output
0.1
LCVF Clamp Active
75
220
RL = channel load resistance. Board layout can also affect thermal characteristics. Refer to the Layout Considerations section for details. The FMS6143A is specified to operate with output currents typically less than 50mA, more than sufficient for a dual (75) 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 18. AC-Coupled Inputs and Outputs
(c) 2009 Fairchild Semiconductor Corporation FMS6143A * Rev. 1.0.0
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FMS6143A -- Low-Cost Three-Channel 6th-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 to guide layout and aide 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. quality output video signal, the series termination resistor must be placed as close to the device output pin as possible. This greatly 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.
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 10F and 0.1F ceramic power supply bypass capacitors. Place the 0.1F capacitor within 0.1 inches of the device power pin. Place the 10F 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. Figure 20. Termination Resistor Placement
Thermal Considerations
Since the interior of most systems; such as set-top boxes, TVs, and DVD players; are at TA=+70C; 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.
PCB Thermal Layout Considerations
Understand the system power requirements and environmental conditions. Maximize thermal performance of the PCB. Consider using 70m of copper for high-power designs. Make the PCB as thin as possible by reducing FR4 thickness. Use vias in the 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 FMS6143A outputs are DC offset from the input by 150mV; therefore, VOUT = 2 x 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 FMS6143A has a 2x (6dB) gain, the output is typically connected via a 75-series back-matching resistor followed by the 75 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 input impedance and the leakage current of the input being driven. To obtain the highest
(c) 2009 Fairchild Semiconductor Corporation FMS6143A * Rev. 1.0.0
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FMS6143A -- Low-Cost Three-Channel 6th-Order Standard Definition Video Filter Driver
Physical Dimensions
5.00 4.80 3.81
8 5
A
0.65
B
6.20 5.80
1.75 4.00 3.80 5.60
PIN ONE INDICATOR
1
4
1.27 0.25 0.25 0.10 CBA
(0.33)
1.27
LAND PATTERN RECOMMENDATION SEE DETAIL A
1.75 MAX 0.51 0.33 R0.10 R0.10
C
0.25 0.19 0.10 C
OPTION A - BEVEL EDGE
0.50 x 45 0.25
GAGE PLANE
0.36
OPTION B - NO BEVEL EDGE
NOTES: UNLESS OTHERWISE SPECIFIED 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
8 0
0.90 0.40
SEATING PLANE
(1.04)
DETAIL A
SCALE: 2:1
Figure 21.
8-Lead, Small Outline Integrated Circuit (SOIC)
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/.
(c) 2009 Fairchild Semiconductor Corporation FMS6143A * Rev. 1.0.0
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FMS6143A -- Low-Cost Three-Channel 6th-Order Standard Definition Video Filter Driver
(c) 2009 Fairchild Semiconductor Corporation FMS6143A * Rev. 1.0.0
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