Zakładka z wyszukiwarką danych komponentów |
|
FMS6400-1 Arkusz danych(PDF) 5 Page - Fairchild Semiconductor |
|
FMS6400-1 Arkusz danych(HTML) 5 Page - Fairchild Semiconductor |
5 / 8 page 5 www.fairchildsemi.com FMS6400-1 Rev. 1A Applications Information Functional Description This product is a two channel monolithic continuous time video filter designed for reconstructing the luminance and chromi- nance signals from an S-Video D/A source. Composite video output is generated by summing the Y and C outputs. The chip is designed to have AC coupled inputs and will work equally well with either AC or DC coupled outputs. The reconstruction filters provide a 5th order Butterworth response with group delay equalization. This provides a maxi- mally flat response in terms of delay and amplitude. Each of the three outputs is capable of driving 2Vpp into a 75Ω load. All channels are clamped during the sync interval to set the appropriate minimum output dc level. With this operation the effective input time constant is greatly reduced, which allows for the use of small low cost coupling capacitors. The net effect is that the input will settle to 10mV in 10ms for any DC shifts present in the input video signal. In most applications the input coupling capacitors are 0.1µF. The Y and C inputs typically sink 1µA of current during active video, which normally tilts a horizontal line by 2mV at the Y out- put. During sync, the clamp restores this leakage current by sourcing an average of 20µA over the clamp interval. Any change in the coupling capacitor values will affect the amount of tilt per line. Any reduction in tilt will come with an increase in set- tling time. Luminance (Y) I/O The typical luma input is driven by either a low impedance source of 1Vpp or the output of a 75Ω 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 cir- cuitry to operate properly. All outputs are capable of driving 2Vpp, AC or DC coupled, into either a single or dual video load. A single video load consists of a series 75 Ω impedance matching resistor connected to a ter- minated 75 Ω line, this presents a total of 150Ω of loading to the part. A dual load would be two of these in parallel which would present a total of 75 Ω to the part. Channel gain of 0dB on all channels can be selected by tying pin 2 to ground. Channel gain of 6dB on all channels can be selected by tying pin 2 to VCC. Both gain settings assume stan- dard input video levels of 1Vpp. Chrominance (C) I/O The chrominance input can be driven in the same manner as the luminance input but is typically only a 0.7Vpp signal. Since the chrominance signal doesn't contain any DC content, the output signal can be AC coupled using as small as a 0.1µF capacitor if DC coupling is not desired. Composite Video (CV) Output The composite video output driver is same as the other outputs. Layout Considerations General layout and supply bypassing play major roles in high frequency performance and thermal characteristics. Fairchild offers a demonstration board, FMS6400DEMO, to use as a guide for layout and to aid in device testing and characterization. The FMS6400DEMO is a 4-layer board with a full power and ground plane. For optimum results, follow the steps below as a basis for high frequency layout: • Include 10 µF and 0.1µF ceramic bypass capacitors • Place the 10 µF capacitor within 0.75 inches of the power pin • Place the 0.1 µF capacitor within 0.1 inches of the power pin • If using DC-coupled outputs, use a large ground plane to help dissipate heat • Minimize all trace lengths to reduce series inductances |
Podobny numer części - FMS6400-1 |
|
Podobny opis - FMS6400-1 |
|
|
Link URL |
Polityka prywatności |
ALLDATASHEET.PL |
Czy Alldatasheet okazała się pomocna? [ DONATE ] |
O Alldatasheet | Reklama | Kontakt | Polityka prywatności | Linki | Lista producentów All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |