Datasheet

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November 2012

FMS6141 Rev. 1.0.3

FMS6141 — Low-Cost, Single-Channel 4

-Order Standard Definition Video Filter Driver

FMS6141

Low-Cost, Single-Channel 4

-Order

Standard Definition Video Filter Driver

Features

 Single 4th-Order 8 MHz (SD) Filter

 Drives Single, AC- or DC-coupled, Video Loads

(2 V

, 150 Ω)

 Drives Dual, AC- or DC-coupled, Video Loads

(2V

, 75Ω)

 Transparent Input Clamping

 AC- or DC-Coupled Input

 AC- or DC-Coupled Output

 DC-Coupled Output Eliminates AC-Coupling

Capacitors

 Single Supply

 Robust 8 kV ESD Protection

 Lead-Free Packages: SOIC-8 or SC70-5

Applications

 Cable Set-Top Boxes

 Satellite Set-Top Boxes

 DVD Players

 HDTVs

 Personal Video Recorders (PVR)

 Video On Demand (VOD)

Description

The FMS6141 Low-Cost Video Filter is intended to

replace passive LC filters and drivers with a low-cost

integrated device. The 4th-order filter provides improved

image quality compared to typical 2nd or 3rd-order

passive solutions.

The FMS6141 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 an AC-coupled

input is required (see Application Information for details).

The FMS6141’s output can drive an AC- or DC-coupled

single (150 Ω) or dual (75 Ω) load. DC-coupling the

output removes the need for output coupling capacitors.

The input DC level is offset approximately +280 mV at

the output (see Application Information for details).

Related Applications Notes

 AN-6041 PCB Layout Considerations for Video

Filter / Drivers

 AN-6024 FMS6xxx Product Series Understanding

Analog Video Signal Clamps, Bias, DC-Restore,

and AC or DC Coupling Methods

Functional Block Diagram

Figure 1. Block Diagram

VIDEO

8MHz, 4

-order

ransparent Clamp

Summary of content (11 pages)

PAGE 1
FMS6141 Low-Cost, Single-Channel 4th-Order Standard Definition Video Filter Driver Features  Single 4th-Order 8 MHz (SD) Filter  Drives Single, AC- or DC-coupled, Video Loads (2 Vpp, 150 Ω)  Drives Dual, AC- or DC-coupled, Video Loads (2Vpp, 75Ω)     Transparent Input Clamping    Single Supply AC- or DC-Coupled Input AC- or DC-Coupled Output DC-Coupled Output Eliminates AC-Coupling Capacitors Description The FMS6141 Low-Cost Video Filter is intended to replace passive LC filters and driver
PAGE 2
Part Number Operating Temperature Range FMS6141CSX -40°C to +85°C 8-Lead, Small Outline Integrated Circuit (SOIC) Tape and Reel FMS6141S5X -40°C to +85°C 5- Lead SC70 Package Tape and Reel Packing Method Package Pin Configurations VIN 1 N/C 2 GND 3 N/C 4 FMS6141 SOIC-8 8 VOUT 7 VCC GND 1 6 N/C GND 2 5 N/C SC70 Pin# 1 3 Name Description VIN Video Input N/C No Connect GND Must Be Connected to Ground 4 N/C No Connect 5 N/C No Connect 6 N/C No Connect 2 3 1, 2
PAGE 3
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 Parameter Min. Max. Unit VCC DC Supply Voltage -0.3 6.0 V VIO Analog and Digital I/O -0.3 VCC +0.
PAGE 4
TA = 25°C, VCC = 5.0 V, RS = 37.5 Ω; input is AC coupled with 0.1 µF; output is AC coupled with 220 µF into a 150 Ω load; unless otherwise noted. Symbol ICC VIN PSRR Parameter Supply Current (1) Conditions Min. No Load Typ. Max. Unit 7 12 mA Video Input Voltage Range Referenced to GND if DCCoupled 1.4 Vpp Power Supply Rejection Ratio DC 40 dB Note: 1. 100% tested at 25°C AC Electrical Specifications TA = 25°C, VCC = 5.0 V, RS = 37.5 Ω; input is AC coupled with 0.
PAGE 5
Input Considerations Output Considerations The FMS6141 Low-Cost Video Filter provides 6 dB (2X) gain from input to output. The device provides an internal diode clamp to support AC-coupled input signals. In this configuration, a 0.1 µF ceramic capacitor is used to AC couple the input signal. If the input signal does not go below ground, the clamp is inactive; but if the input signal goes below ground, the clamp circuitry sets the bottom of the sync tip (or lowest voltage) to just below ground.
PAGE 6
signal. The coupling capacitor and the input termination resistor at the input of the filter/driver should be placed close to the input pin for optimal signal integrity. Figure 6 shows a typical AC-coupled input configuration for driving the filter/driver. Using this configuration, a 0.1 µF ceramic capacitor is used to AC couple the input 0.1µF Clamp / Bias Input RTERM Buf LPF Termination & coupling close to device input Figure 6. Typical Input Configuration 75Ω 75Ω Video Cables 75Ω 0.
PAGE 7
0V - 1.4V 75 LCVF Clamp Mode DVD SoC RTERM Figure 9. AC-Coupled Input and DC-Coupled Output 0V - 1.4V LCVF Clamp Mode DVD SoC 75 220µF RTERM Figure 10. DC-Coupled Input and AC-Coupled Output 0.1µ 0V - 1.4V LCVF Clamp Mode DVD SoC 75 220µF FMS6141 — Low-Cost, Single-Channel 4th-Order Standard Definition Video Filter Driver 0.1µ RTERM Figure 11. AC-Coupled Input and AC-Coupled Output © 2006 Fairchild Semiconductor Corporation FMS6141 Rev. 1.0.3 www.fairchildsemi.
PAGE 8
General layout and supply bypassing play a major role in high-frequency performance and thermal characteristics. Fairchild offers a demonstration board for the FMS6141 to guide layout and aid 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.
PAGE 9
5.00 4.80 A 0.65 3.81 8 5 B 6.20 5.80 1.75 4.00 3.80 1 PIN ONE INDICATOR 5.60 4 1.27 (0.33) 0.25 M 1.27 C B A LAND PATTERN RECOMMENDATION 0.25 0.10 SEE DETAIL A 1.75 MAX R0.10 0.10 0.51 0.33 0.50 x 45° 0.25 C OPTION A - BEVEL EDGE GAGE PLANE R0.10 8° 0° 0.90 0.406 0.25 0.19 C 0.36 OPTION B - NO BEVEL EDGE NOTES: UNLESS OTHERWISE SPECIFIED SEATING PLANE (1.
PAGE 10
FMS6141 — Low-Cost, Single-Channel 4th-Order Standard Definition Video Filter Driver Physical Dimensions (Continued) Figure 13. SC70-5 Package 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.
PAGE 11
FMS6141 — Low-Cost, Single-Channel 4th-Order Standard Definition Video Filter Driver 11 www.fairchildsemi.com © 2006 Fairchild Semiconductor Corporation FMS6141 Rev. 1.0.