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FMS6346 Six Channel, 6th Order SD/HD Video Filter Driver
July 2005
FMS6346 Six Channel, 6th Order SD/HD Video Filter Driver
Features
Three selectable sixth-order 8/32MHz (SD/HD) filters Three fixed sixth-order 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 5V only Robust (12kV HBM) output ESD protection Lead (Pb) Free packages - TSSOP-20
Description
The FMS6346 Low Cost Video Filter (LCVF) is intended to replace passive LC filters and drivers with a low-cost integrated device. Six 6th order Butterworth filters provide improved image quality compared to typical passive solutions. The combination of low power Standard Definition (SD) and High Definition (HD) filters greatly simplify DVD video output circuitry. Three channels offer fixed SD filters while the other three are selectable between SD and HD filters. The FMS6346 offers a fixed gain of 6dB. A metal option is available that provides a fixed gain of 9dB, offering even more flexibility. The FMS6346 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) video loads. DC-coupling the outputs removes the need for output coupling capacitors. The input DC levels will be offset approximately +280mV at the output.
Applications
Cable and Satellite set top boxes DVD players HDTV Personal Video Recorders (PVR) Video On Demand (VOD)
Block Diagram
SD IN1
Transparent Clamp
6dB
SD OUT1
SD IN2
Transparent Clamp
6dB
SD OUT2
SD IN3
Transparent Clamp
6dB
SD OUT3
8MHz, 6th order
SD/HD IN1
Transparent Clamp
6dB
SD/HD OUT
SD/HD IN2
Transparent Clamp
6dB
SD/HD OUT
SD/HD IN3
Transparent Clamp
6dB
SD/HD OUT
FcSEL SD / HD
Selectable 8/32MHz 6th order
(c)2004 Fairchild Semiconductor Corporation
1
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FMS6346 Rev. 1A
FMS6346 Six Channel, 6th Order SD/HD Video Filter Driver
Pin Configuration
Pin Assignments
Pin#
1 2 3 4
Pin
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 Connect +5V supply Selects filter corner frequency for pins 7, 8, and 9. "0" = SD, "1" = HD Selectable SD or HD video input, channel 1 Selectable SD or HD video input, channel 2 Selectable SD or HD video input, channel 3 No Connect No Connect Filtered SD or HD video output, channel 3 Filtered SD or HD video output, channel 2 Filtered SD or HD video output, channel 1 No Connect 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
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
FAIRCHILD
20 19 18 17 16
FMS6346
SD OUT1 SD OUT2
5 6 7
SD OUT3 Gnd Gnd N/C SD/HD OUT1 SD/HD OUT2 SD/HD OUT3 N/C
8 9 10 11
5 6 7 8 9 10
20L TSSOP
15 14 13 12 11
12 13 14 15 16 17 18 19 20
2 FMS6346 Rev. 1A
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FMS6346 Six Channel, 6th Order SD/HD Video Filter Driver
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 74 -65
Min.
Typ.
Max.
150 150 300
Unit
C C C C/W
Recommended Operating Conditions
Parameter
Operating Temperature Range Supply Voltage Range
Min.
0 4.75
Typ.
5.0
Max.
70 5.25
Unit
C V
Factory Programming Options
Part Name FMS6346 FMS6346-9 Part Number FMS6346MTC20 FMS6346MTC209 Gain Option 6dB 9dB
3 FMS6346 Rev. 1A
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FMS6346 Six Channel, 6th Order SD/HD 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 Vil Vih Supply
Parameter
Current1 no load Video Input Voltage Range Digital Input Low1 Digital Input High1
Conditions
Referenced to GND, if DC-coupled FcSEL FcSEL
Min.
Typ.
60 1.4
Max
80
Units
mA Vpp
0 2.4
0.8
V V
Vcc
Standard Definition 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
AVSD f1dBSD fcSD fSBSD DG DP THD XTALKSD SNR tpdSD
Parameter
Channel Gain1
1
Conditions
All SD Channels All SD Channels All SD Channels
Min.
5.6 5.2 6.5 43
Typ.
6.0 7.15 8.0 50 0.7 1.0 0.35 -54 72 90
Max
6.4
Units
dB MHz MHz dB % % dB dB ns
-1dB Bandwidth
-3dB Bandwidth1
Attenuation(stopband reject)1 All SD Channels at f = 27MHz Differential Gain Differential Phase Output Distortion Crosstalk (ch-to-ch) Signal-to-Noise Ratio2 Propagation Delay All SD Channels All SD Channels VOUT = 1.4Vpp, 3.58MHz at 1MHz NTC-7 weighting, 100kHz to 4.2MHz Delay from input to output, 4.5MHz
High Definition 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
AVHD f1dBHD fcHD fSBHD THD XTALKHD SNR tpdHD
Parameter
Channel Gain1 -1dB Bandwidth
1
Conditions
All HD Channels All HD Channels All HD Channels
1
Min.
5.6 28 30 30
Typ.
6.0 31 34 41 0.9 -54 60 25
Max
6.4
Units
dB MHz MHz dB % dB dB ns
-3dB Bandwidth1 Attenuation(stopband reject) Output Distortion (all HD channels) Crosstalk (ch-to-ch) Signal-to-Noise Ratio Propagation Delay
2
All HD Channels at f = 74.25MHz VOUT = 1.4Vpp, 22MHz at 1MHz unweighted, 100kHz to 30MHz Delay from input to output
Notes: 1. 100% tested at 25C 2. SNR = 20 * log (714mV / rms noise)
4 FMS6346 Rev. 1A
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FMS6346 Six Channel, 6th Order SD/HD Video Filter Driver
Applications Information
Functional Description
The FMS6346 Low Cost Video Filter (LCVF) provides 6dB gain (9dB optional, contact factory for further information) 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
1.0 -> 1.02V 0.65 -> 0.67V 0.3 -> 0.32V 0.0 -> 0.02V 2.28V 1.58V 0.88V 0.28V Vout
Figure 2. Input Clamp Circuit I/O Configurations
Vin Driven by: DC-Coupled DAC Outputs or AC-Coupled and Clamped Y, R, G, B, CV
For DC-coupled DAC drive with DC-coupled outputs, use this configuration:
0V - 1.4V
There will be 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 Vin
Figure 3. 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:
0V - 1.4V
1.98V 1.28V 0.58V Vout
Driven by: DC-Coupled DAC Outputs AC-Coupled and Biased U, V, Pb, Pr, C
DVD or STB SoC DAC Output
0.1u
LCVF Clamp Active
75
Figure 1. Typical Voltage Levels
The FMS6346 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 FMS6346 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 4. AC-coupled Inputs, DC-coupled Outputs
When the FMS6346 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 5. SCART Configuration with DC-coupled Outputs
5 FMS6346 Rev. 1A
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FMS6346 Six Channel, 6th Order SD/HD 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 pull-down can be added such that the DC input level is set to 500mV.
Power Dissipation
The FMS6346 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 FMS6346's power dissipation and internal temperature rise. Tj = TA + Pd * JA
External Video source must be AC-coupled.
where Pd = PCH1 + PCH2 + PCHx
0.1u 7.5M
LCVF Bias Input
75
and PCHx = Vs * ICH - (VO2/RL) where VO = 2Vin + 0.280V ICH = (ICC / 6) + (VO/RL) Vin = RMS value of input signal ICC = 60mA
500mV +/-350mV 75
Figure 6. Biased SCART with DC-coupled Outputs
The same circuits can be used with AC-coupled outputs if desired.
Vs = 5V RL = channel load resistance Board layout can also affect thermal characteristics. Refer to the Layout Considerations Section for more information.
0V - 1.4V
DVD or STB SoC DAC Output
LCVF Clamp Inactive
75
220u
Layout Considerations
General layout and supply bypassing play major roles in high frequency performance and thermal characteristics. Fairchild offers a demonstration board, FMS6346DEMO, to use as a guide for layout and to aid in device testing and characterization. The FMS6346DEMO is a 4-layer board with a full power and ground plane. Following this layout configuration will provide the optimum performance and thermal characteristics. For optimum results, follow the steps below as a basis for high frequency layout: * Include 10F and 0.1F ceramic bypass capacitors
Figure 7. DC-coupled Inputs, AC-coupled Outputs
0V - 1.4V
DVD or STB SoC DAC Output
0.1u
LCVF Clamp Active
75
220u
* 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 * For multi-layer boards, use a large ground plane to help dissipate heat * For 2 layer boards, use a ground plane that extends beyond the device by at least 0.5"
Figure 8. DC-coupled Inputs, AC-coupled Outputs
External video source must be AC-coupled.
* Minimize all trace lengths to reduce series inductances
0.1u
7.5M
LCVF Clamp Active
75
220u
500mV +/-350mV 75
Figure 9. 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.
6 FMS6346 Rev. 1A
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FMS6346 Six Channel, 6th Order SD/HD 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
0.1 uF 10 uF
+5V
75
1 Y1OUT 2 19 COUT SD IN2 SD OUT2 SD IN1 SD OUT1 20
220uF
75 Video Cables 75
Y1
75
220uF 75
C
75
3 CVOUT SD IN3 SD OUT3 18
220uF 75
CV
Video SoC
G/Y2OUT
5 Vcc
FAIRCHILD FMS6346 20L TSSOP
16,17 GND
75
7 SD/PS IN1 SD/PS OUT1 14
220uF
75 Video Cables 75
Y2/G
75
8 B/PbOUT SD/PS IN2 SD/PS OUT2 13
220uF 75
Pb/B
75
9 R/PrOUT SD/PS IN3 SD/PS OUT3 FcSEL 12
220uF 75
Pr/R
6
DAC Load Resistors
AC-Coupling Caps are Optional.
Figure 10. Typical application diagram
7 FMS6346 Rev. 1A
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FMS6346 Six Channel, 6th Order SD/HD Video Filter Driver
Mechanical Dimensions
20-Lead Thin Shrink Outline Package (TSSOP)
6 N
e
-B-
7 5
2X E/2 1.0 DIA 1.0
(b)
8
TSSOP-20
c1 SYMBOL A A1 A2 L R R1 b b1 c c1 01 L1 aaa bbb ccc ddd e 02 03 D E1 E e N MIN - 0.05 0.85 0.50 0.09 0.09 0.19 0.19 0.09 0.09 0 NOM - - 0.90 0.60 - - - 0.22 - - - 1.0 REF 0.10 0.10 0.05 0.20 0.65 BSC 12 REF 12 REF 6.50 4.40 6.4 BSC 0.65 BSC 20 MAX 1.10 0.15 0.95 0.75 - - 0.30 0.25 0.20 0.16 8
E1 E
c
b1 ddd C B A
2X N/2 TIPS 123 6
1.0
e /2 9
SECTION AA
ccc
7 -A-
D8 3
A2 A
aaa C
-C-
b NX bbb M C B A
A1
(02) (0.20) R1
-H-
R
GAGE PLANE 10
6.50 4.30
6.60 4.50
A A
0.25
(03)
L (L1)
01
NOTES:
1 All dimensions are in millimeters (angle in degrees).
2 3 4 5
Dimensioning and tolerancing per ASME Y14.5-1994. Dimensions "D" does not include mold flash, protusions or gate burrs. Mold flash protusions or gate burrs shall not exceed 0.15 per side . Dimension "E1" does not include interlead flash or protusion. Interlead flash or protusion shall not exceed 0.25 per side. Dimension "b" does not include dambar protusion. Allowable dambar protusion shall be 0.08mm total in excess of the "b" dimension at maximum material condition. Dambar connot be located on the lower radius of the foot. Minimum space between protusion and adjacent lead is 0.07mm for 0.5mm pitch packages. Terminal numbers are shown for reference only. Datums - A - and - B - to be determined at datum plane - H - . Dimensions "D" and "E1" to be determined at datum plane - H - . This dimensions applies only to variations with an even number of leads per side. For variation with an odd number of leads per side, the "center" lead must be coincident with the package centerline, Datum A.
6 7 8 9
10 Cross sections A - A to be determined at 0.10 to 0.25mm from the leadtip.
8 Lead
SYMBOL D E1 E e N MIN 2.90 4.30 NOM 3.0 4.40 6.4 BSC 0.65 BSC 8 MAX 3.10 4.50 SYMBOL D E1 E e N
14 Lead
MIN 4.90 4.30 NOM 5.00 4.40 6.4 BSC 0.65 BSC 14 MAX 5.10 4.50 SYMBOL D E1 E e N
16 Lead
MIN 4.90 4.30 NOM 5.00 4.40 6.4 BSC 0.65 BSC 16 MAX 5.10 4.50
20 Lead
SYMBOL D E1 E e N MIN 6.50 4.30 NOM 6.50 4.40 6.4 BSC 0.65 BSC 20 MAX 6.60 4.50 SYMBOL D E1 E e N
24 Lead
MIN 7.70 4.30 NOM 7.80 4.40 6.4 BSC 0.65 BSC 24 MAX 7.90 4.50 SYMBOL D E1 E e N
28 Lead
MIN 9.50 4.30 NOM 9.70 4.40 6.4 BSC 0.65 BSC 28 MAX 9.80 4.50
8 FMS6346 Rev. 1A
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FMS6346 Six Channel, 6th Order SD/HD Video Filter Driver
Ordering Information
Model Part Number Gain Option 6dB 6dB Lead Free Yes Yes Package TSSOP-20 TSSOP-20 Container Rail Reel Pack Qty TBD TBD
FMS6346 FMS6346MTC20 FMS6346 FMS6346MTC20X
Temperature range for all parts: 0C to 70C. Contact Fairchild for additional gain options. Refer to Factory Programming Options Table for more information.
9 FMS6346 Rev. 1A
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FMS6346 Six Channel, 6th Order SD/HD Video Filter Driver
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FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component is any component of a life 1. Life support devices or systems are devices or support device or system whose failure to perform can systems which, (a) are intended for surgical implant into be reasonably expected to cause the failure of the life the body, or (b) support or sustain life, or (c) whose support device or system, or to affect its safety or failure to perform when properly used in accordance with instructions for use provided in the labeling, can be effectiveness. reasonably expected to result in significant injury to the user. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Product Status Formative or In Design Definition This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. This datasheet contains preliminary data, and supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design.
Preliminary
First Production
No Identification Needed
Full Production
Obsolete
Not In Production
This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only.
Rev. I7
10 FMS6346 Rev. 1A
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