FMS6144A FAIRCHILD | Alldatasheet

Document overview

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Technical content

Features

ƒ Four-Channel 6th-Order 8MHz (SD) Filter ƒ Drives Single, AC- or DC-Coupled Video Loads (150Ω) ƒ Transparent Input Clamping ƒ Supply Range: 3.3V to 5.0V ƒ AC- or DC-Coupled Inputs and Outputs ƒ Robust 9kV ESD Protection ƒ Lead-Free TSSOP 14-Pin Package

Applications

ƒ Cable Set-Top Boxes ƒ Satellite Set-Top Boxes ƒ DVD Players ƒ HDTV ƒ Personal Video Recorders (PVR) ƒ Video On Demand (VOD)

Description

The FMS6144A Low-Cost Video Filter (LCVF) is intended to replace passive LC filters and drivers with a low-cost integrated device. Four 6 th-order filters provide improved image quality compared to typical 2 nd and 3 rd order passive solutions. The FMS6144A 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 the Applications section for details). The outputs can drive AC- or DC-coupled single (150 Ω) or dual (75 Ω) video loads. DC coupling the outputs removes the need for large output coupling capacitors. The input DC levels are offset approximately +280mV at the output (see the Applications section for details) . Related Applications 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 Operating Temperature Range Eco Status Package Packing Method FMS6144AMTC14X -40°C to +85°C RoHS 14-Lead TSSOP 2500 per Reel For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.

Figure 1. Block Diagram Figure 2. 14-Lead TSSOP (Top View)

1 IN1 Input Video Input Channel 1

2 IN2 Input Video Input Channel 2

3 IN3 Input Video Input Channel 3

4 IN4 Input Video Input Channel 4

5 GND Input Device Ground Connection

6 NA NA No Connection

7 NA NA No Connection

8 NA NA No Connection

9 NA NA No Connection

10 Vcc Input Positive Power Supply

11 OUT4 Output Filtered Output Channel 4

12 OUT3 Output Filtered Output Channel 3

13 OUT2 Output Filtered Output Channel 2

14 OUT1 Output Filtered Output Channel 1

© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FMS6144A • Rev. 1.0.1 3 FMS6144A — Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver 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 Parameter Min. Max. Unit VCC DC Supply Voltage -0.3 6.0 V VIO Analog and Digital I/O -0.3 V CC+0.3 V VOUT Maximum Output Current, Do Not Exceed 50 mA Electrostatic Discharge Information Symbol Parameter Min Unit ESD Human Body Model, JESD22-A114 9 kV Charged Device Model, JESD22-C101 2 Reliability Information Symbol Parameter Min. Typ. Max. Unit TJ Junction Temperature +150 °C TSTG Storage Temperature Range -65 +150 °C TL Lead Temperature (Soldering, 10 Seconds) +300 °C ΘJA Thermal Resistance, JEDEC Standard, Multilayer Test Boards, Still Air 90 °C/W Recommended Operating Conditions The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ens ure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. Symbol Parameter Min. Typ. Max. Unit TA Operating Temperature Range -40 +85 °C VCC Supply Voltage Range 3.14 3.30 5.25 V

© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FMS6144A • Rev. 1.0.1 4 FMS6144A — Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver TA=25°C, VCC=3.3V, RS=37.5Ω, all inputs are AC-coupled with 0.1uF, and all outputs are AC coupled with 220µF into 150Ω load; unless otherwise noted. Symbol Parameter Conditions Min. Typ. Max. Units Supply VCC Supply Voltage Range V S Range 3.14 3.30 5.25 V ICC Quiescent Supply Current (1) VS=+3.3V, No Load 21 24 mA VS=+5.0V, No Load 25 29 VIN Video Input Voltage Range Referenced to GND if DC Coupled 1.4 V PP PSRR Power Supply Rejection Ratio DC (all Channels) -65 dB Note: 1. 100% tested at T A=25°C TA=25°C, VCC=3.3V, RS=37.5Ω, all inputs are AC-coupled with 0.1uF, and all outputs are AC coupled with 220µF into 150Ω load, unless otherwise noted. Symbol Parameter Conditions Min. Typ. Max. Units AV Channel Gain (2) Active Video Input Range = 1V PP 5.8 6.0 6.2 dB BW0.1dB ±0.1dB Bandwidth R SOURCE=75Ω, RL=150Ω 5 MHz BW-1.0dB -1.0 dB Bandwidth R SOURCE=75Ω, RL=150Ω 7 MHz BW3.0dB -3.0 dB Bandwidth R SOURCE=75Ω, RL=150Ω 8 MHz Att27M Normalized Stopband Attenuation(2) RSOURCE=75Ω, f=27MHz 45 60 dB DG Differential Gain - NTSC/PAL Active Video Input Range = 1V PP 0.6 % DP Differential Phase - NTSC/PAL Active Video Input Range = 1V PP 0.6 ° THD Total Harmonic Distortion f=1.00MHz; V OUT=1.4VPP 0.2 % Xtalk Crosstalk (Channel to Channel) f=1.00MHz; VOUT=1.4VPP -65 dB SNR Peak Signal to RMS Noise NTC-7 Weighting: 100kHz to 4.2MHz 74 dB Tpd Propagation Delay Delay from Input to Output; 100KHz to 4.5MHz 90 ns CLG Chroma-Luma Gain (2) 400Khz to 3.58Mhz 95 100 105 % CLD Chroma-Luma Delay 400Khz to 3.58Mhz 7.5 ns Note: 2. 100% tested at T A=25°C

The following circuit may be used for direct DC-coupled drive by DACs with an output voltage range of 0V to 1.4V PP. Figure 12. Typical Application

© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FMS6144A • Rev. 1.0.1 11 FMS6144A — Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver Layout Considerations General layout and supply bypassing play a major role in high-frequency performance and thermal characteristics. Fairchild offers a four-layer board with full power and ground planes 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 configuration provides optimum performance and thermal characteristics for the device. For best results, follow the steps and recommended routing rules below. Recommended Routing / Layout Rules ƒ Do not run analog and digital signals in parallel. ƒ Use separate analog and digital power planes to supply power. ƒ Traces should run on top of the ground plane at all times. ƒ No trace should run over ground/power splits. ƒ Avoid routing at 90-degree angles. ƒ Minimize clock and video data trace length differences. ƒ Include 10μF and 0.1μF ceramic power supply bypass capacitors. ƒ Place the 0.1μF capacitor within 0.1 inches of the device power pin. ƒ Place the 10μF capacitor within 0.75 inches of the device power pin. ƒ For multi-layer boards, use a large ground plane to help dissipate heat. ƒ 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. ƒ Minimize all trace lengths to reduce series inductance. Output Considerations The outputs are DC offset from the input by 150mV therefore V OUT = 2 • V IN DC + 150mV. This offset is required for optimal performanc e from the output driver and is held at the minimum value to decrease the standing DC current into the load. Since the FMS6144A has a 2x (6dB) gain, the output is typically connected via a 75Ω series back-matching resistor followed by the 75Ω video cable. Because of the inherent divide by two of this configuration, the blanking level at the load of the video signal is always less than 1V. When AC-coupling the output, ensure that the coupling capacitor passes the lowest frequency content in the video signal and that line time distortion (video tilt) is kept as low as possible. The selection of the coupling capacitor is a function of the subsequent circuit input impedance and the leakage current of the input being driven. To obtain the highest quality output video signal, the series termination resistor must be placed as close to the device output pin as possible. This greatly reduc es the parasitic capacitance and inductance effect on the output driver. The distance from the device pin to the series termination resistor should be no greater than 0.1 inches. 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 package for maximum heat dissipation. When designing a system board, determine how much power each device dissipates. 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 ƒ Understand the system power requirements and environmental conditions. ƒ Maximize thermal performance of the PCB. ƒ Consider using 70μm of copper for high-power designs. ƒ Make the PCB as thin as possible by reducing FR4 thickness. ƒ Use vias in power pad to tie adjacent layers together. ƒ Remember that baseline temperature is a function of board area, not copper thickness. ƒ Modeling techniques provide a first-order approximation.

0.43 TYP

Figure 22. 14-Lead TSSOP the warranty therein, which covers Fairchild products.

© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FMS6144A • Rev. 1.0.1 13 FMS6144A — Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver