FMS6143

FMS6143_07 FAIRCHILD | Alldatasheet

Document overview

• Manufacturer or author: Fairchild Semiconductor
• PDF pages: 11

Technical content

Features

Three 4th-order 8MHz (SD) fi lters Drives single, AC- or DC-coupled, video loads (2Vpp, 150Ω) Drives dual, AC- or DC-coupled, video loads (2Vpp, 75Ω) Transparent input clamping AC- or DC-coupled inputs AC- or DC-coupled outputs DC-coupled outputs eliminate AC-coupling capacitors 5V only Robust 8kV ESD protection Lead-free SOIC-8 package

Applications

Personal Video Recorders (PVR) Video On Demand (VOD)

Description

The FMS6143 Low-Cost Video Filter (LCVF) is intended to replace passive LC fi lters and drivers with a low-cost integrated device. Three 4th-order fi lters provide improved image quality compared to typical 2nd or 3rd-order passive solutions. The FMS6143 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 (150Ω) or dual (75Ω) loads. DC-coupling the outputs removes the need for output coupling capacitors. The input DC-levels are offset approximately +280mV at the output (see the Applications section for details). Related Application Notes AN-8002 — FMS6418B 4:2:2 Application Note AN-6024 — FMS6xxx Product Series Understanding Analog Video Signal Clamps, Bias, DC- Restore, and AC or DC Coupling Methods AN-6041 — PCB Layout Considerations for Video Filter / Drivers

Ordering Information

Part Number Package Pb-Free Operating Temperture Range Packaging Method FMS6143CS SOIC-8 Yes -40°C to +85°C Tube FMS6143CSX SOIC-8 Yes -40°C to +85°C Tape and Reel Functional Block Diagram Figure 1. AC-Coupled Inputs and Outputs

Figure 2. AC-Coupled Inputs and Outputs

1 IN1 Input Video input, Channel 1

2 IN2 Input Video input, Channel 2

3 IN3 Input Video input, Channel 3

5 GND Output Must be tied to ground, do not fl oat

6 OUT3 Output Filtered output, Channel 3

7 OUT2 Output Filtered output, Channel 2

8 OUT1 Output Filtered output, Channel 1

© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com FMS6143 Rev. 4.0.5 3 FMS6143 Low-Cost Three-Channel 4th-Order Standard Defi nition Video Filter Driver Absolute Maximum Ratings The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defi ned in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table defi nes the conditions for actual device operation. Symbol Parameter Min. Max. Unit VCC DC Supply Voltage -0.3 6.0 V Analog and Digital I/O -0.3 V CC + 0.3 V Output Channel - Any One Channel (Do Not Exceed) 50 mA Note: Functional operation under any of these conditions is NOT implied. Performance and reliability are guaranteed only if operating conditions are not exceeded. Reliability Information Symbols Parameter Min. Typ. Max. Unit TJ Junction Temperature 150 °C TSTG Storage Temperature Range -65 +150 °C TL Lead Temperature (Soldering, 10s) 300 °C θJA Thermal Resistance, JEDEC Standard Multi-layer Test Boards, Still Air 115 °C/W Recommended Operating Conditions The Recommended Operating Conditions table defi nes the conditions for actual device operation. Recommended ope- rating conditions are specifi ed to ensure optimal performance to the datasheet specifi cations. Fairchild does not recom- mend exceeding them or designing to absolute maximum ratings. Symbols Parameter Min. Typ. Max. Unit TA Operating Temperature Range -40 +85 °C VCC VCC Range +4.75 +5.00 +5.25 V

© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com FMS6143 Rev. 4.0.5 4 FMS6143 Low-Cost Three-Channel 4th-Order Standard Defi nition Video Filter Driver TA = 25°C, VCC = 5V, RSOURCE = 37.5Ω; all inputs are AC-coupled with 0.1μF; all outputs are AC-coupled with 220μF into 150Ω loads; unless otherwise noted. Symbol Parameter Conditions Min. Typ. Max. Units I CC Supply Current(1) FMS6143 (No Load) 19 27 mA V IN Video Input Voltage Range Referenced to GND if DC-coupled 1.4 V pp PSRR Power Supply Rejection DC (All Channels) -50 dB TA = 25°C, V IN = 1V pp, V CC = 5V, R SOURCE = 37.5 Ω; all inputs are AC-coupled with 0.1 μF; all outputs are AC-coupled with 220μF into 150Ω loads; unless otherwise noted. Symbol Parameter Conditions Min. Typ. Max. Units AV Channel Gain (1) All Channels 5.6 6.0 6.6 dB f 1dB -1dB Bandwidth(1) All Channels 4.5 6.5 MHz f c -3dB Bandwidth All Channels 7.7 MHz f SB Attenuation (Stopband Reject) All Channels at f = 27MHz 48 dB DG Differential Gain All Channels 0.3 % DP Differential Phase All Channels 0.6 ° THD Output Distortion (All Channels) V OUT = 1.8Vpp, 1MHz 0.4 % X TALK Crosstalk (Channel-to-Channel) at 1MHz -60 dB SNR Signal-to-Noise Ratio All Channels, NTC-7 Weighting: 100kHz to 4.2MHz 75 dB t pd Propagation Delay Delay from Input-to-Output, 4.5MHz 59 ns Note: 100% tested at 25°C.1.

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 DC-coupled outputs may be used with AC-coupled outputs, offering slightly lower power dissipation. Figure 8. Typical Application Diagram

© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com FMS6143 Rev. 4.0.5 9 FMS6143 Low-Cost Three-Channel 4th-Order Standard Defi nition Video Filter Driver Layout Considerations General layout and supply bypassing play a major role in high-frequency performance and thermal characteristics. Fairchild offers a demonstration board to guide layout and aid device evaluation. The demo board is a four-layer board with full power and ground planes. Following this layout con- fi guration provides optimum performance and thermal characteristics for the device. For the best results, follow the steps and recommended routing rules listed below. Recommended Routing/Layout Rules Do not run analog and digital signals in parallel. Use separate analog and digital power planes to supply power. Traces should run on top of the ground plane at all times. No trace should run over ground/power splits. Avoid routing at 90-degree angles. Minimize clock and video data trace length differences. Include 10μF and 0.1μF ceramic power supply bypass capacitors. Place the 0.1μF capacitor within 0.1 inches of the device power pin. Place the 10μF capacitor within 0.75 inches of the device 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 body at least 0.5 inches on all sides. Include a metal paddle under the device on the top layer. Minimize all trace lengths to reduce series inductance. Thermal Considerations Since the interior of most systems, such as set-top boxes, TVs, and DVD players, are at +70ºC; consideration must be given to providing an adequate heat sink for the device pac- kage for maximum heat dissipation. When designing a sys- tem board, determine how much power each device dissipa- tes. Ensure that devices of high power are not placed in the same location, such as directly above (top plane) or below (bottom plane), each other on the PCB. PCB Thermal Layout Considerations Understand the system power requirements and environmental conditions. Maximize thermal performance of the PCB. Consider using 70μm of copper for high-power designs. Make the PCB as thin as possible by reducing FR4 thickness. Use vias in power pad to tie adjacent layers together. Remember that baseline temperature is a function of board area, not copper thickness. Modeling techniques provide a fi rst-order approximation.

Dimensions are in millimeters unless otherwise noted. Figure 18. SOIC-8 Package

FMS6143 Low-Cost Three-Channel 4th-Order Standard Defi nition Video Filter Driver © 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com FMS6143 Rev. 4.0.5 11