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FMS6403 -- Triple Video Drivers with Selectable HD/PS/SD Bypass Filters for RGB and YPbPr Signals
February 2008
FMS6403 Triple Video Drivers with Selectable HD/PS/SD Bypass Filters for RGB and YPbPr Signals
Features
Three Video Anti-aliasing or Reconstruction Filters 2:1 MUX Inputs for YPbPr and RGB Inputs Supports D1, D2, D3, and D4 Video D-connector (EIAJ CP-4120) Selectable 8MHz/15MHz/30MHz 6th-order Filters, Plus Bypass Works with SD (480i), Progressive (480p), and HD (1080i/ 720p) AC-coupled Inputs Include DC Restore / Bias Circuitry All Outputs Can Drive AC- or DC-Coupled 75 Loads and Provide Either 0dB or 6dB of Gain 0.40% Differential Gain, 0.25 Differential Phase TSSOP-20 Packaging
Description
The FMS6403 offers comprehensive filtering for TV, set-top box, or DVD applications. This part consists of a triple, sixth-order filter with selectable 30MHz, 15MHz, or 8MHz cutoff frequency. The filters may also be bypassed so that the bandwidth is limited only by the output amplifiers. A 2:1 multiplexer is provided on each filter channel. The triple filters are intended for YPbPr and RGB signals. The DC clamp levels are set according to the RGB_SEL control input. YPbPr sync tips are clamped to 250mV, 1.125V, and 1.125V, respectively; while RGB sync tips are all clamped to 250mV. Sync clamp timing can be derived from the Y/G inputs or from the external SYNC_IN pin. The 8MHz and 15MHz filter settings support bi-level sync, while the 30MHz filter setting and bypass mode support tri-level sync. All channels nominally accept AC-coupled 1VPP signals. Selectable 0dB or 6dB gain allows the outputs to drive 1VPP or 2VPP signals into AC- or DC-coupled terminated loads with a 1VPP input. Input signals cannot exceed 1.5VPP and outputs cannot exceed 2.5VPP.
Applications
Progressive Scan Cable Set-top Boxes Home Theaters Satellite Set-top Boxes DVD Players HDTV Personal Video Recorders (PVR) Video On Demand (VOD)
Ordering Information
Part Number
FSM6403MTC FSM6403MTC20X
Operating Temperature Range
0 to 70C 0 to 70C
Package
20-Lead, Thin Shrink Small Outline Package (TSSOP) 20-Lead, Thin Shrink Small Outline Package (TSSOP)
Packing Method
94 Units in Tubes 2500 Unit Tape and Reel
All packages are lead free per JEDEC: J-STD-020B standard.
(c) 2005 Fairchild Semiconductor Corporation FMS6403 * Rev. 1.0.4
www.fairchildsemi.com
FMS6403 -- Triple Video Drivers with Selectable HD/PS/SD Bypass Filters for RGB and YPbPr Signals
Functional Block Diagram
Figure 1. Block Diagram
Typical Application
Figure 2. Typical Application Circuit
(c) 2005 Fairchild Semiconductor Corporation FMS6403 * Rev. 1.0.4 www.fairchildsemi.com 2
FMS6403 -- Triple Video Drivers with Selectable HD/PS/SD Bypass Filters for RGB and YPbPr Signals
Pin Configuration
Figure 3. 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
EXT_SYNC RGB_SEL Y1/G1 Y2/G2 Pb1/B1 Pb2/B2 Pr1/R1 Pr2/R2 FSEL0 FSEL1 GND GND 0dB_SEL Pr/ROUT Pb/BOUT Y/GOUT In2_SEL SYNC_IN VCC VCC
Type
Input Input Input Input Input Input Input Input Input Input Input Input Input Output Output Output Input Input Input Input
Description
Selects the external SYNC_IN signal when set to logic 1; do not float. Selects RGB clamp levels when set to logic 1. YPbPr clamps levels when set to logic 0; do not float. Y or G input 1 - may be connected to a signal that includes sync. Y or G input 2 - may be connected to a signal that includes sync. Pb or B input 1. Pb or B input 2. Pr or R input 1. Pr or R input 2. Selects filter corner frequency or bypass, see Table 2. Do not float. Selects filter corner frequency or bypass, see Table 2. Do not float. Must be tied to ground, do not float. Must be tired to ground, do not float. Selects output gain of 0dB when set to logic 1; 6dB when set to logic 0. Do not float. Pr or R output. Pb or B output. Y or G output. Selects MUX input 2 when set to logic 1; MUX input 1 when set to logic 0. Do not float. External sync inputs signal, square wave crossing VIL and VIN input thresholds. Do not float. +5V supply. Do not float. +5V supply. Do not float.
(c) 2005 Fairchild Semiconductor Corporation FMS6403 * Rev. 1.0.4
www.fairchildsemi.com 3
FMS6403 -- Triple Video Drivers with Selectable HD/PS/SD Bypass Filters for RGB and YPbPr Signals
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.
+6.6 VCC + 0.3 60
Unit
V V mA
Output Current, Any One Channel, Do Not Exceed
Note: 1. Functional operation under any of these conditions is not implied.
Reliability Information
Symbol
TJ TSTG TL JA Junction Temperature Storage Temperature Range Lead Temperature, Soldering 10 seconds Thermal Resistance, JEDEC Standard Multi-layer Test Boards, Still Air 74 -65
Parameter
Min.
Typ.
Max.
+150 +150 +300
Unit
C C C C/W
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 RSOURCE VCC Range
Parameter
Operating Temperature Range Input Source Resistance
Min.
0 4.75
Typ.
5.00
Max.
70 5.25 150
Unit
C V
(c) 2005 Fairchild Semiconductor Corporation FMS6403 * Rev. 1.0.4
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FMS6403 -- Triple Video Drivers with Selectable HD/PS/SD Bypass Filters for RGB and YPbPr Signals
DC Electrical Specifications
TA=25C, VI=1VPP, VCC=5.0V; all inputs AC coupled with 0.1F; all outputs AC coupled into 150; referenced to 400kHz; unless otherwise noted.
Symbol
ICC VI VIL VIH VCLAMP1 VCLAMP2 PSRR
Parameter
Supply Current
(2)
Conditions
VCC, no load FSELO, FSEL1, RGB_SEL, 0dB_SEL, EXT_SYNC, IN2_SEL, SYNC_IN FSELO, FSEL1, RGB_SEL, 0dB_SEL, EXT_SYNC, IN2_SEL, SYNC_IN R,G,B,Y Pb and Pr DC, All Channels
Min.
Typ.
90 1.5
Max.
130
Units
mA VPP
Input Voltage Maximum Digital Input Low
(2)
0 2.4 250 1.125 -40
0.8 VCC
V V mV V dB
Digital Input High
(2)
Output Clamp Voltage Output Clamp Voltage Power Supply Rejection Ratio
Note: 2. 100% tested at 25C.
Standard-Definition Electrical Specifications
TA=25C, VI=1VPP, VCC=5.0V, FSEL0=0, FSEL1=0, 0dB_SEL=0 (gain=6dB), RSOURCE=37.5; all inputs AC coupled with 0.1F; all outputs AC coupled with 220F into 150 referenced to 400kHz; unless otherwise noted.
Symbol
AVSD f1dBSD fCSD fSBSD dG d THD XTALK INMUXISO SNR tpdSD T1 T2
Parameter
SD Gain, 0dB_SEL=0 SD Gain, 0dB_SEL=1
(3) (3)
Conditions
All Channels, SD Mode All Channels All Channels All Channels at f=27MHz All Channels All Channels VOUT=1.8VPP at 1MHz At 1.0MHz At 1.0MHz All Channels, NTC-7 Weighting, 4.2MHz Lowpass, 100Khz Highpass Delay from Input to Output at 4.5MHz
Min.
5.6 -0.4 5.5
Typ.
6.0 0 7.6 8.5
Max.
6.4 0.4
Units
dB MHz MHz dB % % dB dB dB ns ns s
-1dB Bandwidth for SD -3dB Bandwidth for SD Attenuation: SD (Stop-band (3) Rejection) Differential Gain Differential Phase Output Distortion, All Channels Crosstalk, Channel-to-channel INMUX Isolation Signal-to-Noise Ratio Propagation Delay for SD SYNC to SYNC_IN Delay SYNC_IN Minimum Pulse Width
40
56 0.40 0.25 0.4 -68 -70 74 80 10 4
Note: 3. 100% tested at 25C.
(c) 2005 Fairchild Semiconductor Corporation FMS6403 * Rev. 1.0.4
www.fairchildsemi.com 5
FMS6403 -- Triple Video Drivers with Selectable HD/PS/SD Bypass Filters for RGB and YPbPr Signals
Progressive Scan (PS) Electrical Specifications
TA=25C, VI=1VPP, VCC=5.0V, FSEL0=1, FSEL1=0, 0dB_SEL=0 (gain=6dB), RSOURCE=37.5; all inputs AC coupled with 0.1F; all outputs AC coupled with 220F into 150 referenced to 400kHz; unless otherwise noted.
Symbol
AVPS f1dBPS fCPS fSBPS tpdPS T1 T2
Parameter
PS Gain, 0dB_SEL=0 PS Gain, 0dB_SEL=1
(4) (4) (4)
Conditions
All Channels PS Mode All Channels PS Mode All Channels All Channels All Channels at f=54MHz Delay from Input to Output at 10MHz
Min.
5.6 -0.4 10
Typ.
6.0 0 15 17
Max.
6.4 0.4
Units
dB dB MHz MHz dB ns ns s
-1dB Bandwidth for PS
-3dB Bandwidth for PS Attenuation, PS (Stop-band (4) Reject) Propagation Delay for PS SYNC to SYNC_IN Delay SYNC_IN Minimum Pulse Width
40
48 45 10 2
Note: 4. 100% tested at 25C.
High-Definition Electrical Specifications
TA=25C, VI=1VPP, VCC=5.0V, FSEL0=0, FSEL1=1, 0dB_SEL=0 (gain=6dB), RSOURCE=37.5; all inputs AC coupled with 0.1F; all outputs AC coupled with 220F into 150 referenced to 400kHz; unless otherwise noted.
Symbol
AVHD f1dBHD fCHD fSBHD tpdHD T1 T2
Parameter
HD Gain, 0dB_SEL=0 HD Gain, 0dB_SEL=1
(5) (5) (5)
Conditions
All Channels HD Mode All Channels HD Mode All Channels All Channels All Channels at f=74.25MHz Delay from Input to Output at 20MHz
Min.
5.6 -0.4 20
Typ.
6.0 0 29 33
Max.
6.4 0.4
Units
dB dB MHz MHz dB ns ns s
-1dB Bandwidth for HD
-3dB Bandwidth for HD Attenuation, HD (Stop-band (5) Reject) Propagation Delay for HD SYNC to SYNC_IN Delay SYNC_IN Minimum Pulse Width
30
40 26 10 1.5
Note: 5. 100% tested at 25C.
Unfiltered 1080p Bypass (Wide Bandwidth) Electrical Specifications
TA=25C, VI=1VPP, VCC=5.0V, FSEL0=1, FSEL1=1, 0dB_SEL=0 (gain=6dB), RSOURCE=37.5; all inputs AC coupled with 0.1F; all outputs AC coupled with 220F into 150 referenced to 400kHz; unless otherwise noted.
Symbol
AVWB f1dBWB fCWB tpdWB
Parameter
Gain, 0dB_SEL=0 Gain, 0dB_SEL=1 -1dB Bandwidth -3dB Bandwidth Propagation Delay
(6) (6)
Conditions
All Channels Bypass Mode All Channels Bypass Mode All Channels All Channels Delay from Input to Output at 20MHz
Min.
5.6 -0.4
Typ.
6.0 0 63 91 10
Max.
6.4 0.4
Units
dB dB MHz MHz ns
Note: 6. 100% tested at 25C.
(c) 2005 Fairchild Semiconductor Corporation FMS6403 * Rev. 1.0.4
www.fairchildsemi.com 6
FMS6403 -- Triple Video Drivers with Selectable HD/PS/SD Bypass Filters for RGB and YPbPr Signals
Typical Performance Characteristics
TA=25C, VI=1VPP, VCC=5.0V, FSEL0=0, FSEL1=0, 0dB_SEL=0 (gain=6dB), RSOURCE=37.5; all inputs AC coupled with 0.1F; all outputs AC coupled with 220F into 150, referenced to 400kHz; unless otherwise noted.
Figure 4. SD Frequency Response
Figure 5. SD Group Delay vs. Frequency
Figure 6. SD Noise vs. Frequency
Figure 7. SD Differential Gain
Figure 8. SD Differential Phase
(c) 2005 Fairchild Semiconductor Corporation FMS6403 * Rev. 1.0.4 www.fairchildsemi.com 7
FMS6403 -- Triple Video Drivers with Selectable HD/PS/SD Bypass Filters for RGB and YPbPr Signals
Progressive Scan (PS) Typical Performance Characteristics
TA=25C, VI=1VPP, VCC=5.0V, FSEL0=1, FSEL1=0, 0dB_SEL=0 (gain=6dB), RSOURCE=37.5; all inputs AC coupled with 0.1F; all outputs AC coupled with 220F into 150, referenced to 400kHz; unless otherwise noted.
Figure 9. PS Frequency Response
Figure 10. PS Group Delay vs. Frequency
High-Definition Typical Performance Characteristics
TA=25C, VI=1VPP, VCC = 5.0V, FSEL0=0, FSEL1=1, 0dB_SEL=0 (gain=6dB), RSOURCE=37.5; all inputs AC coupled with 0.1F; all outputs AC coupled with 220F into 150, referenced to 400kHz; unless otherwise noted.
Figure 11. HD Frequency Response
Figure 12. HD Group Delay vs. Frequency
Unfiltered 1080p Bypass (WB) Typical Performance Characteristics
TA=25C, VI=1VPP, VCC=5.0V, FSEL0=1, FSEL1=1, 0dB_SEL=0 (gain=6dB), RSOURCE=37.5; all inputs AC coupled with 0.1F; all outputs AC coupled with 220F into 150, referenced to 400kHz: unless otherwise noted.
Figure 13. Bypass Mode Frequency Response
(c) 2005 Fairchild Semiconductor Corporation FMS6403 * Rev. 1.0.4
Figure 14. Bypass Mode Group Delay vs. Frequency
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FMS6403 -- Triple Video Drivers with Selectable HD/PS/SD Bypass Filters for RGB and YPbPr Signals
Functional Description
Introduction
The FMS6403 is a next-generation filter solution from Fairchild Semiconductor addressing the expanding filtering needs for televisions, set-top boxes, and DVD players, including progressive scan capability. The product provides selectable filtering with cutoff frequencies of 30MHz, 15MHz, and 8MHz for all three channels. In addition, the filters can be bypassed for wider bandwidth applications. The FMS6403 allows consumer devices to support a variety of resolution standards with the same hardware. Multiplexers on the channel inputs are controlled by the IN2_SEL pin. The RGB_SEL pin can be used to set the sync tip clamp voltages for YPbPr or RGB applications. All three channels are set for 250mV sync tips to reduce DC-coupled power dissipation for RGB inputs. The lower output bias voltage is not suitable for the PbPr outputs; so for YPbPr inputs, these signals are clamped to 1.125V, while Y is still clamped to 250mV. Sync tip clamping voltages are set by forcing the desired DC bias level during the active sync period. For systems without sync on Y/G, an external sync input is provided. If sync exists on one input Y/G signal, but not on the other Y/G input signal, the IN2_SEL and EXT_SYNC control inputs may be wired together on the PCB to switch the sync source with the input source. Both standard-definition (bi-level) and high-definition (trilevel) sync are supported at the Y/G inputs and SYNC_IN depending on the FSEL[1:0] inputs. See the Sync Processing section for further details. Standard-definition (480i) and progressive (480p) signals are clamped by forcing the signal to the desired voltage during the sync pulse. For signals with sync, the sync tip itself is forced to the clamp voltage (typically 250mV). When high-definition (HD) sync is present (trilevel sync) the sync tip duration is too short to allow this approach. To accurately clamp HD signals, the sync pulse starts a timer and the actual clamping is done at the blanking level right after the sync pulse. The sync tip is typically placed at 250mV if its amplitude is 300mV. All three outputs are driven by amplifiers with selectable gains of 0dB or +6dB. The gain is set with the 0dB_SEL pin. These amplifiers can drive two terminated video loads (75) to 2VPP with a 1VPP input when set to 6dB gain. The input range is limited to 1.5VPP and the output range is limited to 2.5VPP. All control inputs must be driven high or low. Do not leave them floating. Figure 15. Bi-level Sync Tip Clamping and Bias In some cases, the sync voltage may be compressed to less than the nominal 300mV value. The FMS6403 can successfully recover SD and progressive scan sync greater than 100mV (compressed to 33% of nominal). The FMS6403 can properly recover sync timing from luma and green, which include sync. If none of the video signals includes sync, the EXT_SYNC control input can be set high and an external sync signal must be input on the SYNC_IN pin. Refer to the External Sync section for more details. The timing required for this operating mode is shown in Figure 16. SYNC timings, T1 and T2, are defined in the SD Electrical Specifications section. applied to the SYNC_IN pin. When there is no video signal on the video inputs, SYNC_IN can be a sync pulse every 60s to mimic the slowest sync in a regular video signal. The following two sections discuss the sync processing and timing required in more detail.
SD and Progressive Scan Video Sync Processing
The FMS6403 must control the DC offset of AC-coupled input signals since the average DC level of video varies with image content. If the input offset is allowed to wander, the common-mode input range of the amplifiers can be exceeded, leading to signal distortion. DC offset adjustment is referred to as "clamping" or, in some cases, biasing, and must be done at the correct time during each video line. The optimum time is during the sync pulse, since it is the lowest input voltage. This approach works well for 480i and 480p signals since the sync tip duration is long enough to allow the DC-offset errors to be compensated from line to line. The DCoffset of the sync tip is adjusted as illustrated in Figure 15 by forcing a current on the input during the sync pulse. The sync tip is clamped to approximately 250mV. Signals like Pb and Pr with a symmetric voltage range (350mV) are clamped to approximately 1.125V. Note that the following diagrams illustrate DC restore functionality and indicate output voltage levels for both 0dB and 6dB gain (1VPP and 2VPP video signals at the output pin).
External SYNC Mode
The FMS6403 can properly recover sync timing from video signals that include sync. If the Y-input video signals do not include sync, the FMS6403 can be used in sxternal SYNC mode. In external sync mode, (EXT_SYNC pin is high), a pulsed input must be applied to the SYNC_IN pin. If there is no video signal present, therefore no sync signal present, there must be an input
(c) 2005 Fairchild Semiconductor Corporation FMS6403 * Rev. 1.0.4
www.fairchildsemi.com 9
FMS6403 -- Triple Video Drivers with Selectable HD/PS/SD Bypass Filters for RGB and YPbPr Signals
Sync Timing
Normally, the FMS6403 responds to bi-level sync and clamps the sync tip during period `B' in Figure 19. When the filters are switched to high-definition mode (30MHz) or bypass mode, the sync processing responds to trilevel sync and clamps to the blanking level during period `C' in Figure 19. Note: 9. The diagram indicates SYNC timings at the output pin. Figure 16. Bi-level External Sync Clamping and Bias
HD and Bypass Mode Video Sync Processing
When the input signal is a high-definition signal, the trilevel sync pulse is too short to allow proper clamp operation. Rather than clamp during the sync pulse, the sync pulse is located and the signal is clamped to the blanking level. This is done such that the sync tip is set to approximately 250mV for signals with 300mV sync tip amplitude. The EXT_SYNC control input selects the sync stripper output or the SYNC_IN pin for use by the clamp circuit. Note: 7. The SYNC_IN timing for HD signals is different from the timing for SD or PS signals. For HD signals, the SYNC_IN signal must be high when the clamp must be active. This is during the time immediately after the sync pulse while the signal is at the blanking level. This operation is shown in Figure 17. Note that the following diagrams illustrate DC restore functionality and indicate output voltage levels for both 0dB and 6dB gain (1VPP and 2VPP video signals at the FMS6403 output pin). SYNC timings, T1 and T2, are defined in the HD Electrical Specifications table section.
Figure 18. Sync Timing Bi-level
Figure 19. Sync Timing Tri-level The tri-level sync pulse is located such that the broad pulses in the vertical interval do not trigger the clamp. To improve the system settling at turn-on, the broad pulses are clamped to just above ground. Once the broad pulses (and tri-level sync tips) are above ground, the normal clamping process takes over and clamps to the blanking level during period `C' in Figure 19. FMS6403 is supports the video standards and associated sync timings shown in Table 1, (additional standards, such as 483p59.94, also work correctly).
Figure 17. Tri-level Blanking Clamp Note: 8. Tri-level sync may only be compressed 5%. If HD sync is compressed more than 5%, it may not be properly located.
(c) 2005 Fairchild Semiconductor Corporation FMS6403 * Rev. 1.0.4
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FMS6403 -- Triple Video Drivers with Selectable HD/PS/SD Bypass Filters for RGB and YPbPr Signals
Table 1. Sync Timings
Format
480i 480p 720p 1080i 1080p
Refresh
30Hz 60Hz 60Hz 30Hz 60Hz
Sample Rate
13.5MHz 27 MHz 74.25 MHz 74.25 MHz 148.5 MHz
Period (T)
74ns 37ns 13.4ns 13.4ns 6.7ns
A
20T=1.5s 20T=750ns 70T=938ns 20T=589ns 20T=596ns
B
64T=4.7s 64T=2.35s 40T=536ns 44T=589ns 44T=296ns
C
61T=4.5s 61T=2.25s 220T=2.95ns 148T=1.98ns 148T=996ns
H-Rate
15.75kHz 31.5kHz 45kHz 33.75kHz 67.5kHz
Note: 10. Timing values are approximate for 30Hz/60Hz refresh rates.
Table 2. Filter Settings
FSEL1, Pin 10
0 0 1 1
FSEL0, Pin 9
0 1 0 1
Filter -3db Frequency
8MHz 15MHz 32MHz Filter Bypass
Video Format
SD, 480i PS, 480p HD, 1080i, 720p Unfiltered 1080p
Sync Format
Bi-level, 4.7s pulse width Bi-level, 2.35s pulse width Tri-level, 589ns pulse width Tri-level, 290ns pulse width
Table 3. Gain Settings Tables
0dB_SEL, Pin 13
0 1
Gain (dB)
6 0
VIN/
(11)
VOUT
(11)
1VPP 1VPP
2VPP 1VPP
Note: 11. Video level does not include damp voltage, which offsets the input above ground.
Table 4. Sync Settings
EXT_SYNC, Pin 1
0 1 Table 5. Clamp Settings
Sync Source
Y/G Input, Pin 3/4 SYNC_IN Input, Pin 2
RGB_SEL, Pin 2
0
Input
Y1, Pin 3 Pb1, Pin 5 Pr1, Pin 7 G1, Pin 3
Output
Y, Pin 16 Pb, Pin 15 Pr, Pin 14 G, Pin 16 B, Pin 15 R, Pin 14
Clamp Voltage
250mV 1.125V 1.125V 250mV 250mV 250mV
1
B1, Pin 5 R1, Pin 7
(c) 2005 Fairchild Semiconductor Corporation FMS6403 * Rev. 1.0.4
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FMS6403 -- Triple Video Drivers with Selectable HD/PS/SD Bypass Filters for RGB and YPbPr Signals
Applications Information
Input Circuitry
The DC restore circuit requires a source impedance (RSOURCE = RS || RT) of less than or equal to 150 for correct operation. Driving the FMS6403 with a highimpedance source (e.g. a DAC loaded with 330) does not yield optimum results. Refer Figure 2 for details. calculate the FMS6403's power dissipation and internal temperature rise: TJ = TA + Pd JA where: PD = PCH1 + PCH2 + PCH3 and: 2 PCHx = VS * ICH - (VO /RL) where: VO = 2VIN + 0.280V ICH = (ICC / 3) + (VO/RL) VIN = RMS value of input signal ICC = 90mA VS = 5V RL = channel load resistance (1)
Output Drive
The FMS6403 is specified to operate with output currents typically less than 60mA, more than sufficient for a dual (75) video load. Internal amplifiers are current limited to approximately 100mA and should withstand brief-duration, short-circuit conditions; however, this capability is not guaranteed. The maximum specified input voltage of 1.5VPP can be sustained for all inputs. When the input is clamped to 1.125V, this does not result in a meaningful output signal. With a gain of 6dB, the output should be 1.125V 1.5V, which is not possible since the output cannot drive below ground. This condition will not damage the part; however, the output will be clipped. For signals clamped to 250mV, this does not occur. Signals at mid-scale during SYNC (Pb and Pr) must be clamped to 1.125V. Signals that are at their lowest during SYNC (Y, R, G, B) must be clamped to 250mV for proper operation. Clamping a Pr signal to 250mV results in clipping the bottom of the signal. The 220F capacitor coupled with the 150 termination, as shown in the Figure 2, forms a highpass filter that blocks the DC while passing the video frequencies and avoiding tilt. Any value lower than 220F creates problems, such as video tilt. Higher values, such as 470F - 1000F, are the most optimal output coupling capacitor. By AC coupling, the average DC level is zero and the output voltages of all channels is centered ~zero.
Board layout can also affect thermal characteristics. Refer to the Layout Considerations Section for more information. The FMS6403 is specified to operate with output currents typically less than 60mA, 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
General layout and supply bypassing play major roles in high-frequency performance and thermal characteristics. Fairchild offers an evaluation board, FMS6403DEMO, to guide layout and aid device testing and characterization. The FMS6403DEMO is a fourlayer board with a full power and ground planes. 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. 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. Minimize all trace lengths to reduce series inductances. If routing across a board, place devise such that longer traces are at the inputs rather than the outputs. If using multiple, low-impedance DC-coupled outputs; special layout techniques can help dissipate heat. For dual-layer boards, place a 0.5-inch to 1-inch (1.27cm to 2.54cm) square ground plane directly under the device and on the bottom side of the board. Use multiple vias to connect the ground planes. For multi-layer boards, additional planes (connected with vias) can be used for additional thermal improvements. Worst-case additional die power due to DC loading can 2 be estimated at (VCC /4Rload) per output channel. This 2 assumes a constant DC output voltage of VCC . For 5V VCC with a dual DC video load, add 25/(4*75) = 83mW, per channel.
Sync Recovery
The FMS6403 typically recovers bi-level sync with amplitude greater than 100mV (33% compressed relative to the nominal 300mV amplitude). The FMS6403 looks for the lowest signal voltage and clamps this to approximately 250mV at the output. Tri-level sync may not be compressed more than 5% (15mV) for correct operation. Tri-level sync is located by finding the edges of the tri-level pulse and running a timer to operate the clamp during the back porch interval. The selection of the 8MHz or 15MHz filters enables bilevel sync recovery. Selection of the 30MHz filter or bypass mode enables tri-level sync recovery. Bi-level and tri-level sync recovery are not interchangeable. See the Sync Processing section for more information.
Power Dissipation
The 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
(c) 2005 Fairchild Semiconductor Corporation FMS6403 * Rev. 1.0.4
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FMS6403 -- Triple Video Drivers with Selectable HD/PS/SD Bypass Filters for RGB and YPbPr Signals
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) 2005 Fairchild Semiconductor Corporation FMS6403 * Rev. 1.0.4
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FMS6403 -- Triple Video Drivers with Selectable HD/PS/SD Bypass Filters for RGB and YPbPr Signals
(c) 2005 Fairchild Semiconductor Corporation FMS6403 * Rev. 1.0.4
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