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FMS6646 -- Six Channel, 6th-Order SD/HD 1080p Video Filter Driver
July 2009
FMS6646 Six Channel, SD/HD (1080p) Video Filter Driver
Features
Three Selectable 8/75MHz (SD/HD 1080p) Filters Three Fixed 8MHz (SD) Filters Transparent Input Clamping Single Video Load Drive (2VPP, 150, AV = 6dB) AC- or DC-Coupled Inputs AC- or DC-Coupled Outputs DC-Coupled Outputs Eliminate AC-Coupling Capacitors Low-Power Robust Output ESD Protection: 9kV HBM
Description
The FMS6646 Low Cost Video Filter (LCVF) is intended to replace passive LC filters and drivers with a low-cost integrated device. Six Butterworth filters provide improved image quality compared to typical passive solutions. The combination of low-power StandardDefinition (SD) and High-Definition (HD 1080p) filters greatly simplifies DVD video output circuitry. Three channels offer fixed SD filters, while the other three are selectable between SD and HD filters. The FMS6646 offers a fixed gain of 6dB. The FMS6646 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 Information section for details). The outputs can drive AC- or DC-coupled single (150) video loads. DC-coupling the outputs removes the need for output coupling capacitors. The input DC levels are offset approximately +280mV at the output.
Applications
Cable and Satellite Set-Top Boxes DVD Players HDTV Personal Video Recorders (PVR) Video On Demand (VOD)
Ordering Information
Part Number
FMS6646MTC20X
Operating Temperature Range
-40C to +85C
Gain Setting
6dB
Eco Status
RoHS
Package
TSSOP-20
Packing Method
2500 / Reel
For Fairchild's definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html
Figure 1. Block Diagram
(c) 2009 Fairchild Semiconductor Corporation FMS6646 * Rev. 1.0.1
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FMS6646 -- Low-Cost, Six-Channel Video Filter Driver for SD/HD 1080p
Pin Configuration
SD IN1 SD IN2 SD IN3 N/C VCC FcSEL SD/HD IN1 SD/HD IN2 SD/HD IN3 N/C
1 2 3 4 5 6 7 8 9 10
20 19
SD OUT1 SD OUT2 SD OUT3 GND GND N/C SD/HD OUT1 SD/HD OUT2 SD/HD OUT3 N/C
FMS6646
20L TSSOP
18 17 16 15 14 13 12 11
Figure 2. Pin Configuration
Pin Definitions
Pin#
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Name
SD IN1 SD IN2 SD IN3 N/C VCC FcSEL SD/HD IN1 SD/HD IN2 SD/HD IN3 N/C N/C SD/HD OUT3 SD/HD OUT2 SD/HD OUT1 N/C GND GND SD OUT3 SD OUT2 SD OUT1
Type
Input Input Input Input Input Input Input Input Input Input Input Output Output Output Input Input Input Output Output Output
Description
SD video input, channel 1 SD video input, channel 2 SD video input, channel 3 No Connection +3.3V supply Selects filter corner frequency for pins 7, 8, and 9: "0" = SD, "1" = PS Selectable SD or PS video input, channel 1 Selectable SD or PS video input, channel 2 Selectable SD or PS video input, channel 3 No Connection No Connection Filtered SD or PS video output, channel 3 Filtered SD or PS video output, channel 2 Filtered SD or PS video output, channel 1 No Connection Must be tied to ground Must be tied to ground Filtered SD video output, channel 3 Filtered SD video output, channel 2 Filtered SD video output, channel 1
(c) 2009 Fairchild Semiconductor Corporation FMS6646 * Rev.1.0.1
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FMS6646 -- Low-Cost, Six-Channel Video Filter Driver for SD/HD 1080p
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
VCC VIO IOUT DC Supply Voltage Analog and Digital I/O
Parameter
Min.
-0.3 -0.3
Max.
6.0 VCC+0.3 50
Unit
V V mA
Output Current, Any One Channel, Do Not Exceed
Reliability Information
Symbol
TJ TSTG TL JA Junction Temperature Storage Temperature Range Reflow Temperature Thermal Resistance, JEDEC Standard Multi-Layer Test Boards, Still Air 74 -65
Parameter
Min.
Typ.
Max.
+150 +150 +260
Unit
C C C C/W
Electrostatic Discharge Information
Symbol
ESD
Parameter
Human Body Model, JESD22-A114 Charged Device Model, JESD22-C101
Max.
9 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.
Symbol
TA VCC
Parameter
Operating Temperature Range Supply Voltage Range
Min.
-40 3.135
Typ.
3.30
Max.
+85 5.25
Unit
C V
DC Electrical Characteristics
Unless otherwise noted, TA=25C, VCC=3.3V, RSOURCE=37.5, inputs AC coupled with 0.1F, all outputs AC coupled with 220F into 150 loads, referenced to 400kHz.
Symbol
ICC VIN VIL VIH
Parameter
Supply Current
(1)
Conditions
No Load Referenced to GND if DC Coupled FcSEL FcSEL
Min.
Typ.
80 1.4
Max.
95
Units
mA VPP
Video Input Voltage Range Digital Input Low
(1) (1)
0 2.4
0.8 VCC
V V
Digital Input High
Note: 1. 100% tested at 25C.
(c) 2009 Fairchild Semiconductor Corporation FMS6646 * Rev.1.0.1
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FMS6646 -- Low-Cost, Six-Channel Video Filter Driver for SD/HD 1080p
Standard-Definition (480i) Electrical Characteristics
Unless otherwise noted, TA=25C, VIN=1VPP, VCC=3.3V, RSOURCE=37.5, all inputs AC coupled with 0.1F, all outputs AC coupled with 220F into 150 loads, referenced to 400kHz.
Symbol
AVSD f01dBSD f1dBSD fcSD fSBSD DG DP THD XTALKSD SNR tpdSD CLGSD CLDSD
Parameter
Channel Gain
(2)
Conditions
All SD Channels All SD Channels All SD Channels
Min.
5.8 5.5 6.5 50
Typ.
6.0 5.5 7.15 8.0 60 0.5 0.3 0.25 -70 72 90 100 6
Max.
6.2
Units
dB MHz MHz MHz dB % % dB dB ns % ns
-0.1dB Flatness -1dB Flatness
(2) (2) (2)
-3dB Bandwidth
All SD Channels All SD Channels at f=27MHz All SD Channels All SD Channels VOUT=1.4VPP, 3.58MHz 1MHz
(3)
Attenuation (Stopband Reject) Differential Gain Differential Phase
Total Harmonic Distortion, Output Crosstalk (ch-to-ch) Signal-to-Noise Ratio Propagation Delay Chroma Luma Gain Chroma Luma Delay
NTC-7 weighting, 100kHz to 4.2MHz Delay from input to output, 4.5MHz f=3.58MHz (refer to SDIN at 400kHz) f=3.58MHz (refer to SDIN at 400kHz)
Notes: 2. 100% tested at 25C. 3. SNR=20 * log (714mV / rms noise).
High-Definition (1080p) Electrical Characteristics
Unless otherwise noted, TA=25C, VIN=1VPP, VCC=3.3V, RSOURCE=37.5, all inputs AC coupled with 0.1F, all outputs AC coupled with 220F into 150 loads, referenced to 400kHz.
Symbol
AVHD f1dBHD fcHD fsbHD THD XTALKHD SNR tpdHD
Parameter
Channel Gain
(4) (4) (4) (4)
Conditions
All HD Channels All HD Channels All HD Channels All HD Channels, f=148MHz All HD Channels, VOUT=1.4VPP, 22MHz 1MHz Unweighted; 100kHz to 70MHz Delay from input to output
Min.
5.8 55 70 15
Typ.
6.0 65 75 20 0.2 -72 70 6
Max.
6.2
Units
dB MHz MHz dB % dB dB ns
-1dB Bandwidth -3dB Bandwidth
Attenuation Stopband Reject
Total Harmonic Distortion, Output Crosstalk (ch-to-ch) Signal-to-Noise Ratio Propagation Delay
(5)
Notes: 4. 100% tested at 25C. 5. SNR=20 * log (714mV / rms noise).
(c) 2009 Fairchild Semiconductor Corporation FMS6646 * Rev.1.0.1
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FMS6646 -- Low-Cost, Six-Channel Video Filter Driver for SD/HD 1080p
Typical Performance Characteristics
Figure 3.
0.5 0.0 -0.5
FMS6646 SD Frequency Response
Attenuation (dB)
-1.0 -1.5 -2.0 -2.5 -3.0 -3.5 -4.0
4. 1
3. 7
2. 5
2. 9
1. 3
1. 7
2. 1
3. 3
4. 5
Frequency (MHz)
Figure 4.
5 0
FMS6646 SD Frequency Response (Flatness)
Attenuation (dB)
-5 -10 -15 -20 -25 -30
(c) 2009 Fairchild Semiconductor Corporation FMS6646 * Rev.1.0.1
8. 2 16 .3 24 .4 32 .5 40 .6 48 .7 56 .8 64 .9 73 .0 81 .1 89 .2 97 .2 10 5. 3 11 3. 4 12 1. 5 12 9. 6 13 7. 7 14 5. 8 15 3. 9 16 2. 0 17 0. 1 17 8. 2
Frequency (MHz)
0. 1
Figure 5.
FMS6646 HD Frequency Response
8. 1
0. 1
5. 3
0. 9
5. 7
0. 5
4. 9
6. 1
6. 5
6. 9
7. 3
7. 7
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FMS6646 -- Low-Cost, Six-Channel Video Filter Driver for SD/HD 1080p
Typical Performance Characteristics (Continued)
Figure 6.
FMS6646 HD Frequency Response (Flatness)
Figure 7.
Differential Gain
Figure 8.
Differential Phase
(c) 2009 Fairchild Semiconductor Corporation FMS6646 * Rev.1.0.1
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FMS6646 -- Low-Cost, Six-Channel Video Filter Driver for SD/HD 1080p
Typical Application
DVD Player or STB
0.1 F 10.0 F
+5V
Y1 OUT
1
SD IN1
SD OUT1
20
75
220F
75 Video Cable s 75
Y1
2
C OUT
3
SD IN2
SD OUT2
19
75
220F 75
C
CV OUT
SD IN3
SD OUT3
18
75
220F 75
CV
4 N/C GND
16, 17
Video SoC
5 Vcc 75 220F 75 Video Cable s 75 8 SD/HD IN2 SD/HD OUT2 75 9 SD/HD IN3 N/C 15 SD/HD OUT3 12 F cSEL 6 75 220F 75 13 75 220F
G/Y2 OUT
7 SD/HD IN1 SD/HD OUT1
14
Y2/G
B/Pb OUT
Pb/B
R/Pr OUT
Pr/R
DAC load resistors
AC-coupling caps are optional
Figure 9. Typical Application
(c) 2009 Fairchild Semiconductor Corporation FMS6646 * Rev.1.0.1
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FMS6646 -- Low-Cost, Six-Channel Video Filter Driver for SD/HD 1080p
Applications Information
Functional Description
The FMS6646 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 10.
1.0 -> 1.02V
800k 0.65V
YIN
Driver
YOUT
0.65 -> 0.67V 0.3 -> 0.32V 0.0 -> 0.02V V IN
Figure 11. Input Clamp Circuit
I/O Configurations
For DC-coupled DAC drive with DC-coupled outputs, use the configuration shown in Figure 12.
Driven by: DC-Coupled DAC Outputs AC-Coupled and Clamped Y, CV, R, G, B
0V - 1.4V
2.28V 1.58V 0.88V 0.28V V OUT
There is a 280mV offset from the DC input level to the DC output level. VOUT = 2 * VIN + 280mV.
DVD or STB SoC DAC Output
LCVF Clamp Inactive
75
0.85V 0.5V 0.15V V IN 1.98V 1.28V 0.58V V OUT
Figure 12. DC-Coupled Inputs and Outputs 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 13.
0V - 1.4V
Driven by: AC-Coupled and Biased U, V, Pb, Pr, C
DVD or STB SoC DAC Output
0.1F
LCVF Clamp Active
75
Figure 10. Typical Voltage Levels The FMS6646 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 out puts to directly drive the FMS6646 without an AC coupling capacitor. The worstcase sync tip compression due to the clamp does 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 input is ACcoupled, the diode clamp sets the sync tip (or lowest voltage) just below ground. For symmetric signals like C, U, V, Cb, Cr, 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 11.
(c) 2009 Fairchild Semiconductor Corporation FMS6646 * Rev.1.0.1
Figure 13. AC-Coupled Inputs, DC-Coupled Outputs When the FMS6646 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 14.
0V - 1.4V
External video source must be AC coupled
0.1F
LCVF Clamp Active
75
75
Figure 14. SCART Configuration with DC-Coupled Outputs
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FMS6646 -- Low-Cost, Six-Channel Video Filter Driver for SD/HD 1080p
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 800k20%, so the external resistance should be 7.5M to set the DC level to 500mV. If a pull-up resistance less than 7.5M is desired, an external pulldown can be added such that the DC input level is set to 500mV.
External video source must be AC coupled
Power Dissipation
The FMS6646 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 FMS6646's power dissipation and internal temperature rise: TJ = TA + Pd * JA where Pd = PCH1 + PCH2 + PCHx and
0.1F
7.5M
LCVF Bias Input
75
PCHx = VS * ICH - (VO /RL) where VO = 2VIN + 0.280V ICH = (ICC / 6) + (VO/RL) VIN = RMS value of input signal ICC = 90mA , VS = 3.3V RL = channel load resistance Board layout can affect thermal characteristics. Refer to the Layout Considerations section for more information.
2
75
500mV +/-350mV
Figure 15. Biased SCART with DC-Coupled Outputs The same circuits can be used with AC-coupled outputs if desired, as shown in Figure 16.
0V - 1.4V
DVD or STB SoC DAC Output
LCVF Clamp Inactive
75
220F
Output Considerations
The FMS6646 outputs will be 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 in order to decrease the standing DC current into the load. Since the FMS6646 has a 2x (6dB) gain, the output is typically connected via a 75 series back-matching resistor followed by the 75 video cable. Because of the inherent divide by two of this configuration, the blanking level at the load of the video signal is always less then 1V. When AC-coupling the output ensure that the coupling capacitor of choice will pass 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. In order to obtain the highest 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 FMS6646 output driver. Recommend distance from device pin to place series termination resistor should be no greater than 0.1 inches.
Figure 16. DC-Coupled Inputs, AC-Coupled Outputs
0V - 1.4V
DVD or STB SoC DAC Output
0.1F
LCVF Clamp Active
75
220F
Figure 17. -Coupled Inputs, AC-Coupled Outputs
External video source must be AC coupled.
7.5MW 0.1F
LCVF Clamp Active
75W
220F
75W
500mV +/-350mV
Figure 18. Biased SCART with AC-Coupled Outputs
Note: 6. 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.
(c) 2009 Fairchild Semiconductor Corporation FMS6646 * Rev.1.0.1 9
Figure 19. Distance from Device Pin to Series Termination Resistor
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FMS6646 -- Low-Cost, Six-Channel Video Filter Driver for SD/HD 1080p
Layout Considerations
General layout and supply bypassing play major roles in high-frequency performance and thermal characteristics. Fairchild offers a demonstration board, FMS6646DEMO, to guide layout and aid device testing and characteriza-tion. The FMS6646DEMO is a four-layer board with a full power and ground plane. Following this layout configura-tion pro vides the optimum performance and thermal char-acteristics. For best results, follow the steps below as a basis for high-frequency layout:
Include 0.01F and 0.1F ceramic bypass capacitors. Place the 0.01F capacitor within 0.75 inches of the power pin. Place the 0.1F 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.
(c) 2009 Fairchild Semiconductor Corporation FMS6646 * Rev.1.0.1
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FMS6646 -- Low-Cost, Six-Channel Video Filter Driver for SD/HD 1080p
Physical Dimensions
Figure 20.
20-Lead Thin Shrink Small Outline Package (TSSOP)
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 FMS6646 * Rev.1.0.1
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FMS6646 -- Low-Cost, Six-Channel Video Filter Driver for SD/HD 1080p
(c) 2009 Fairchild Semiconductor Corporation FMS6646 * Rev.1.0.1
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