FAIRCHILD AN-6028 handbook
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1. ee Ee di FAIRCHILD ee SEMICONDUCTOR AN 6028 www fairchildsemi com FMS6406 Evaluation Board Application Note Summary The FMS6406 evaluation board provides a flexible base for evaluating the performance of the FMS6406 The board operates from a standard supply voltage of 5V 5 The FMS6406 is a dual Y C 5th order Butterworth low pass video filter driver optimized for minimum overshoot and flat group delay The device also contains a summing circuit to generate filtered composite video an audio trap and a group delay compensation circuit For a complete description of the FMS6406 please refer to the FMS6406 datasheet at http www fairchildsemi com pf FM FMS6406 html FMS6406 Applications Cable set top boxes Satellite set top boxes Personal Video Recorders PVR Video On Demand VOD Evaluation Kit Contents The FMS6406 Evaluation Kit contains the following items AN 6028 FMS6406 Evaluation Board Application Note The latest revision of the FMS6406 datasheet also available at http www fairchildsemi com Fully functional FMS6406 evaluation board Female power connector CVow RFModour Figure 1 FMS6406 Block Diagram 2006 Fairchild Semiconductor Corporation Rev 0 0 3 8 11 06 www fairchildsemi com AN 6028 Board Setup Use the following procedure to verify that the FMS6406 evaluation board is functional2. This only verifies functionality These instructions do not test any parameters outlined in the datasheet The following test equipment is necessary to test the FMS6406 evaluation board One power supply 5V 5 250mA m One high resolution CRT monitor One NTSC or PAL video signal source capable of generating necessary outputs One video measurement set VM700 Assorted video cables Do NOT turn on power supply until all connections are completed Bill of Materials APPLICATION NOTE Board Test 1 Set the power supply to 5 0V 2 Connect the power supply to the input voltage terminals of the evaluation board 3 Connect the Your signal from the signal source to the connector on the FMS6406 evaluation board 4 Connect the Cour signal from the signal source to the connector on the FMS6406 evaluation board 5 Connect the CVn of the monitor to the CVoyr connector on the FMS6406 evaluation board 6 Turn on the power supply 7 Verify test pattern that is produced from the generator is the same as the pattern on the monitor screen Functional test is complete Item Quantity Reference Part 1 3 C1 C2 C8 0 1uF 2 4 C3 C4 C5 C6 220uF 3 1 C7 0 01uF 4 1 C10 22uF 25v 5 1 C11 0 47uF 25v 6 1 D1 GREEN 7 1 D2 1N4004 8 1 FB1 10uH 9 6 JP1 JP2 JP3 JP4 JP5 JP6 JUMPER 10 1 JP7 PWRCONS3 11 6 J1 J2 J3 J4 45 J6 BNC 12 10 R1 R2 R5 R6 R7 R8 R9 R1
3. 0 R11 R12 75 13 5 R2 R3 R4 R13 R14 0 14 6 TP1 TP2 TP3 TP4 TP5 TP6 TP 15 1 U1 FMS6406 2006 Fairchild Semiconductor Corporation Rev 0 0 3 8 11 06 www fairchildsemi com APPLICATION NOTE AN 6028 Board Schematic 92 Ane NOOUMd 019 AGZ 32770 Ho YOOTNL za 99 S 0 old 0 5 usar sar gt Jnozz 5 ra Tno 11 1109 Na 6 sr dL SL 0 E vu CERMAN 90995 o lt 1100 Tt 7 1nONO JON T INOA NIA r dL 8 wo T St anoo 9 0 19 82 eu CELMA ear 9 Jnozz sz ayy TINA 11 INOA ona Su er dL tdi zu uadwnr anyo 9 NO INNO T zr dL zdl 7 i iu uadwnr ld anyo LAdNIA www fairchildsemi com 2006 Fairchild Semiconductor Corporation Rev 0 0 3 8 11 06 AN 6028 Applications Information The FMS6406 is designed to support AC coupled input and may have AC or DC coupled output Both channels have DC restore circuitry to clamp the DC input levels during video sync The Y and C channels use separate feedback clamps The clamp pulse is derived from the Y channel Luminance Y I O The typical luma input is driven by either a low impedance source of p or the output o
4. are intended for surgical implant into the body or b support or sustain life or c whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user 2 Acritical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or System or to affect its safety or effectiveness 2006 Fairchild Semiconductor Corporation Rev 0 0 3 8 11 06 www fairchildsemi com
5. f a 750 terminated line driven by the output of a current DAC In either case the input must be capacitively coupled to allow the sync detect and DC restore circuitry to operate properly All outputs are capable of driving 2V AC or DC coupled into either a single or dual video load A single video load consists of a series 75 O impedance matching resistor connected to a terminated 75 Q line which presents a total of 150 loading to the part A dual load would be two in parallel which would present a total of 75 to the part The gain of the Y C and CV signals is 6dB with 1V input levels Even when two loads are present the driver produces a full 2V signal at its output pin Chrominance C I O The chrominance input can be driven in the same manner as the luminance input but is typically only a 0 7V signal Since the chrominance signal doesn t contain any DC content the output signal can be AC coupled using a capacitor as small as 0 luF if DC coupling is not desired APPLICATION NOTE Composite Video CV Output The composite video output driver is the same as the other outputs When driving a dual load either output functions if the other output connection is inadvertently shorted providing these loads are AC coupled Equalizer Notch EQ NOTCH Output This output is designed to drive a 600 Q load to 2V p to meet its primary intention of driving a modulator load Layout Considerations General layout and
6. supply bypassing play major roles in high frequency performance and thermal characteristics The FMS6406 evaluation board is a four layer board with full power and ground planes Following this layout configuration provides the optimum performance and thermal characteristics For best results follow the rules below as a basis for high frequency layout Include 1uF and 0 1 F ceramic bypass capacitors Place the 1uF capacitor within 0 75 inches of the power pin Place the 0 1uF capacitor within 0 1 inches of the 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 by at least 0 5 inches m Minimize all trace lengths to reduce series inductances DISCLAIMER 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 THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION As used herein 1 Life support devices or systems are devices or systems which a
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FAIRCHILD AN 6028 handbook