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FMS6363 Low Cost Three Channel 6th Order High Definition Video Filter Driver
December 2005
FMS6363 Low Cost Three Channel 6th Order High Definition Video Filter Driver
Features
Three sixth-order 30MHz (HD) 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 5V only
Description
The FMS6363 Low Cost Video Filter (LCVF) is intended to replace passive LC filters and drivers with a low-cost integrated device. Three 6th order filters provide improved image quality compared to typical lower order passive solutions. The FMS6363 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) loads. DC-coupling the outputs removes the need for output coupling capacitors. The input DC levels will be offset approximately +280mV at the output (see applications section for details).
Robust 8KV ESD protection Lead (Pb) Free package- SOIC-8
Applications
Cable and Satellite set top boxes DVD players HDTV Personal Video Recorders (PVR) Video On Demand (VOD)
Block Diagram
IN1
Transparent Clamp
6dB
OUT1
IN2
Transparent Clamp
6dB
OUT2
IN3
Transparent Clamp
6dB
OUT3
30MHz, 6th order
FMS6363 Rev. 1B
1
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FMS6363 Low Cost Three Channel 6th Order High Definition Video Filter Driver
Pin Configuration
Pin Assignments
Pin# Pin
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 3 +5V supply Ground Filtered output, channel 3 Filtered output, channel 2 Filtered output, channel 1
IN1 IN2 IN3 Vcc
1 2 3 4
FAIRCHILD FMS6363 SOIC-8
8 7 6 5
OUT1 OUT2 OUT3 GND
1 2 3 4 5 6 7 8
Absolute Maximum Ratings
Parameter
DC Supply Voltage Analog and Digital I/O Output Current, Any One Channel (Do Not Exceed)
Min.
-0.3 -0.3
Max.
6 Vcc + 0.3 50
Unit
V V mA
Reliability Information
Parameter
Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 10s) Thermal Resistance (ThetaJA), JEDEC Standard, Multi-Layer Test Boards, Still Air 112.7 -65
Min.
Typ.
Max.
150 150 300
Unit
C C C C/W
Recommended Operating Conditions
Parameter
Operating Temperature Range Supply Voltage Range Input Source Resistance (RSOURCE)
Min.
0 4.75
Typ.
5.0
Max.
70 5.25 300
Unit
C V
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2
FMS6363 Rev. 1B
FMS6363 Low Cost Three Channel 6th Order High Definition Video Filter Driver
DC Electrical Characteristics
Tc = 25C, Vcc = 5V, Rsource = 37.5, inputs AC coupled with 0.1uF, all outputs AC coupled with 220uF into 150 loads, referenced to 400kHz; unless otherwise noted. Symbol
ICC Vin
Parameter
Supply Current1 Video Input Voltage Range no load
Conditions
Referenced to GND, if DC-coupled
Min.
Typ.
22 1.4
Max
30
Units
mA Vpp
AC Electrical Characteristics
Tc = 25C, Vin = 1Vpp, Vcc = 5V, Rsource = 37.5, all inputs AC coupled with 0.1uF, all outputs AC coupled with 220uF into 150 loads, referenced to 400kHz; unless otherwise noted. Symbol
AV f1dB fc fSB1 fSB2 fSB3 THD1 THD2 THD3 XTALK SNR1 SNR2 tpd Crosstalk (ch-to-ch) Signal-to-Noise Ratio2 (all channels) Propagation Delay Output Distortion3 (all channels) Attenuation(stopband reject) -1dB
Parameter
Channel Gain1 Bandwidth1 All Channels All Channels All Channels
Conditions
Min.
5.4 23
Typ.
6.0 30 33 6.5 14.5
Max
6.6
Units
dB MHz MHz dB dB dB % % % dB dB ns
-3dB Bandwidth
All Channels at f = 37.125MHz All Channels at f = 44.25MHz All Channels at f = 74.25MHz1 VOUT = 1.4Vpp, 10MHz VOUT = 1.4Vpp, 15MHz VOUT = 1.4Vpp, 22MHz at 1MHz unweighted; 30MHz lowpass, 100kHz to 30MHz Delay from input to output 32
36 0.2 0.4 1.2 -60 65 20
Notes: 1. 100% tested at 25C 2. SNR = 20 * log (714mV/rms noise) 3. 1.4Vpp active video
FMS6363 Rev. 1B
3
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FMS6363 Low Cost Three Channel 6th Order High Definition Video Filter Driver
Typical Performance Characteristics
Tc = 25C, Vcc = 5V, Rsource = 37.5, inputs AC coupled with 0.1uF, all outputs AC coupled with 220uF into 150 loads, referenced to 400kHz; unless otherwise noted. Figure 1. Frequency Response
12 6 0 -6
1 2 Mkr Frequency Ref 400kHz 1 2 3 Gain 6dB
Figure 2. Group Delay vs. Frequency
15 10 5
1
28.847MHz -1dB BW 33.11MHz -3dB BW 74.25MHz -32.11dB
-12 -18 -24 -30 -36 -42 -48 400kHz 20 40 60
Delay (ns)
Gain (dB)
fSBSD = Gain(ref) - Gain(3) = 38.11dB
0 -5 -10
3
-15
1 = 32MHz (10.32ns)
80
100
120
140
-20 400kHz 10
20
30
40
50
60
70
80
90
Frequency (MHz)
Frequency (MHz)
Figure 3. PSRR vs. Freq. (No Bypass Caps)
-20 -30 -40
Figure 4. PSRR vs. Freq. (Bypass Caps)
-30
Using 0.1F and 0.01F Bypass Capacitors as suggested
-40
PSRR (dB)
-50 -60 -70 -80 -90 0.1 1 10 30
PSRR (dB)
-50 -60 -70 -80 -90 0.1 1 10 30
Frequency (MHz)
Frequency (MHz)
Figure 5. SYNC Tip Compression vs. RSOURCE
2
SYNC Tip Compression (mV)
1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 25 50 75 100 125 150 175 200 225 250 275 300
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4
FMS6363 Rev. 1B
FMS6363 Low Cost Three Channel 6th Order High Definition Video Filter Driver
Applications Information
Functional Description
The FMS6363 Low Cost Video Filter (LCVF) provides 6dB gain from input to output. In addition, the input will be 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.
coupling capacitor. A conceptual illustration of the input clamp circuit is shown below:
0.65V
YOUT
YIN
Driver
800k
1.02V
Figure 7. Input Clamp Circuit
0.32V 0.02V 2.28V
I/O Configurations
Vin Driven by: DC-Coupled DAC Outputs or AC-Coupled and Clamped Y, R, G, B, CV Vout
For DC-coupled DAC drive with DC-coupled outputs, use this configuration:
0V - 1.4V
0.88V 0.28V
There will be a 280mV offset from the DC input level to the DC output level. Vout = 2 * Vin + 280mV 0.85V 0.5V 0.15V Vin
DVD or STB SoC DAC Output
LCVF Clamp Inactive
75
Figure 8. DC-coupled inputs and outputs
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 follows:
Driven by: DC-Coupled DAC Outputs AC-Coupled and Biased U, V, Pb, Pr, C Vout
0V - 1.4V
1.98V 1.28V 0.58V
DVD or STB SoC DAC Output
0.1u
LCVF Clamp Active
75
Figure 6. Typical Voltage Levels
The FMS6363 provides an internal diode clamp to support ACcoupled input signals. If the input signal does not go below ground, the input clamp will not operate. This allows DAC outputs to directly drive the FMS6363 without an AC coupling capacitor. The worst-case sync tip compression due to the clamp will not exceed 7mV. The input level set by the clamp combined with the internal DC offset will keep the output within its acceptable range. When the input is AC-coupled, the diode clamp will set 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
Figure 9. AC-coupled inputs, DC-coupled outputs
When the FMS6363 is driven by an unknown external source or a SCART switch with its own clamping circuitry the inputs should be AC-coupled as follows:
0V - 1.4V 0.1u
External Video source must be AC-coupled.
75
LCVF Clamp Active
75
Figure 10. SCART with DC-coupled outputs
FMS6363 Rev. 1B
5
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FMS6363 Low Cost Three Channel 6th Order High 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. 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.
Power Dissipation
The FMS6363 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 FMS6363's power dissipation and internal temperature rise. Tj = TA + Pd * JA
External Video source must be AC-coupled.
0.1u
7.5M
where Pd = PCH1 + PCH2 + PCH3
LCVF Bias Input
75
and PCHx = Vs * ICH - (VO2/RL) where VO = 2Vin + 0.280V ICH = (ICC / 3) + (VO/RL)
75
500mV +/-350mV
Figure 11. Biased SCART with DC-coupled outputs
The same circuits can be used with AC-coupled outputs if desired.
Vin = RMS value of input signal ICC = 24mA Vs = 5V RL = channel load resistance
0V - 1.4V
DVD or STB SoC DAC Output
LCVF Clamp Inactive
75
220u
Board layout can also affect thermal characteristics. Refer to the Layout Considerations Section for more information. The FMS6363 is specified to operate with output currents typically less than 50mA, more than sufficient for a single (150) video load. Internal amplifiers are current limited to a maximum of 100mA and should withstand brief duration short circuit conditions, however this capability is not guaranteed.
Layout Considerations Figure 12. DC-coupled inputs, AC-coupled Outputs
General layout and supply bypassing play major roles in high frequency performance and thermal characteristics. Fairchild offers a demonstration board, FMS6363DEMO, to use as a guide for layout and to aid in device testing and characterization. The FMS6363DEMO is a 4-layer board with a full power and ground plane. For optimum results, follow the steps below as a basis for high frequency layout: * Include 10F and 0.1F ceramic bypass capacitors * Place the 10F capacitor within 0.75 inches of the power pin * Place the 0.1F capacitor within 0.1 inches of the power pin
0V - 1.4V
DVD or STB SoC DAC Output
0.1u
LCVF Clamp Active
75
220u
Figure 13. AC-coupled inputs and outputs
* Connect all external ground pins as tightly as possible, preferably with a large ground plane under the package * Layout channel connections to reduce mutual trace inductance
External video source must be AC-coupled.
7.5M 0.1u
LCVF Clamp Active
500mV +/-350mV
75
220u
* Minimize all trace lengths to reduce series inductances. If routing across a board, place device such that longer traces are at the inputs rather than the outputs. If using multiple, low impedance DC coupled outputs, special layout techniques may be employed to help dissipate heat. If a multilayer board is used, a large ground plane directly under the device will help reduce package case temperature.
75
Figure 14. Biased SCART with AC-coupled outputs
NOTE: The video tilt or line time distortion will be dominated by the AC-coupling capacitor. The value may need to be increased beyond 220uF in order to obtain satisfactory operation in some applications.
For dual layer boards, an extended plane can be used. Worse case additional die power due to DC loading can be estimated at (VCC2/4Rload) per output channel. This assumes a constant DC output voltage of VCC2. For 5V Vcc with a dual DC video load, add 25/(4*75) = 83mW, per channel.
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6
FMS6363 Rev. 1B
FMS6363 Low Cost Three Channel 6th Order High Definition Video Filter Driver
Typical Application Diagram
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 DCcoupled outputs may be used with AC-coupled outputs offering slightly lower power dissipation.
DVD Player or STB
+5V 0.1 uF 10 uF
75
1 R/Pr 8
220uF
75 Video Cables 75
R/Pr
IN1
OUT1
RSOURCE
G/Y
2
FMS6363 8L SOIC
IN2 OUT2
75
7
220uF 75
G/Y
Video SoC
B/Pb
RSOURCE
3 6
75
IN3
220uF 75
B/Pb
OUT3
RSOURCE
4 5
Vcc
GND
DAC Load Resistors
RSOURCE = DAC load resistor // video SoC output resistance
AC-Coupling Caps are Optional
Figure 15. Typical application diagram
FMS6363 Rev. 1B
7
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FMS6363 Low Cost Three Channel 6th Order High Definition Video Filter Driver
Mechanical Dimensions
8-Lead Small Outline Package (SOIC)
SOIC-8
D e ZD C L 7 SYMBOL A1 B C D E e H h L A ZD A2 L MIN MAX 0.10 0.25 0.36 0.46 0.19 0.25 4.80 4.98 3.81 3.99 1.27 BSC 5.80 6.20 0.25 0.50 0.41 1.27 1.52 1.72 8 0 0.53 ref 1.37 1.57
C L
E
H
Pin No. 1
B
DETAIL-A
h x 45
NOTE:
DETAIL-A 1. All dimensions are in millimeters. 2. Lead coplanarity should be 0 to 0.10mm (.004") max. 3. Package surface finishing: (2.1) Top: matte (charmilles #18~30). (2.2) All sides: matte (charmilles #18~30). (2.3) Bottom: smooth or matte (charmilles #18~30). 4. All dimensions excluding mold flashes and end flash from the package body shall not exceed 0.152mm (.006) per side (D).
A
A1
A2
C
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8
FMS6363 Rev. 1B
FMS6363 Low Cost Three Channel 6th Order High Definition Video Filter Driver
Ordering Information
Model Part Number Lead Free Yes Yes Package SOIC-8 SOIC-8 Container Rail Reel Pack Qty 95 2500
FMS6363 FMS6363CS FMS6363 FMS6363CSX
Temperature range for all parts: 0C to 70C.
FMS6363 Rev. 1B
9
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FMS6363 Low Cost Three Channel 6th Order High Definition Video Filter Driver
FMS6363 Rev. 1B
10
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