FMS6501 Fairchild Semiconductor, FMS6501 Datasheet - Page 12

• Manufacturer Part Number: FMS6501
• Description: 12 Input / 9 Output Video Switch Matrix with Input Clamp, Input Bias Circuitry, and Output Drivers
• Manufacturer: Fairchild Semiconductor

© 2004 Fairchild Semiconductor Corporation
FMS6501 Rev. 1.0.4
Layout Considerations
General layout and supply bypassing play major roles in
high-frequency performance and thermal characteristics.
Fairchild offers a demonstration board, FMS6501DEMO,
to use as a guide for layout and to aid in device testing
and characterization. The FMS6501DEMO is a 4-layer
board with a full power and ground plane. For optimum
results, follow the steps below as a basis for high fre-
quency layout.
■
■
■
■
■
■
If using multiple, low-impedance, DC-coupled outputs,
special layout techniques may be employed to help dissi-
pate heat.
If a multilayer board is used, a large ground plane
directly under the device helps reduce package case
temperature.
For dual-layer boards, an extended plane can be used.
Worst-case, additional die power due to DC loading can
be estimated at (V
assumes a constant DC output voltage of V
V
per channel.
cc
Include 10µF and 0.1µF bypass capacitors.
Place the 10µF capacitor within 0.75 inches of the
power pin.
Place the 0.1µF capacitor within 0.1 inches of the
power pin.
Connect all external ground pins as tightly as possible,
preferably with a large ground plane under the
package.
Layout channel connections to reduce mutual trace
inductance.
Minimize all trace lengths to reduce series induc-
tances. If routing across a board, place device such
that longer traces are at the inputs rather than the
outputs.
with a dual-DC video load, add 25/(4*75) = 83mW,
cc
2
Figure 14. HDTV Application using the FMS6501 Video Switch Matrix
/4R
load
) per output channel. This
cc
/2. For 5V
12
FMS6501 Video Switch Matrix Applications
The increased demand for consumer multimedia sys-
tems has created a challenge for system designers to
provide cost-effective solutions to capitalize on the
growth potential in graphics display technologies. These
applications requires cost-effective video switching and
filtering solutions to deploy high-quality display technolo-
gies rapidly and effectively to the target audience. Areas
of specific interest include HDTV, media centers, and
automotive “infotainment” (includes navigation, in-cabin
entertainment, and back-up camera). In all cases, the
advantages an integrated video switch matrix provides
are high quality video switching specific to the applica-
tion, as well as video input clamps and on-chip, low-
impedance output cable drivers with switchable gain.
Generally the largest application for a video switch is for
the front end of an HDTV, where it takes multiple inputs
and routes them to appropriate signal paths (main pic-
ture and picture in picture - PiP). These are normally
routed into ADCs followed by decoders. There are many
different technologies for HDTV; including LCD, Plasma,
and CRT, with similar analog switching circuitry.
An example of a HDTV application is shown in Figure 14.
This system combines a video switch matrix and two
three-channel switchable anti-aliasing filters. There are
two three-channel signal paths in the system; one for the
main picture, the other for “Picture in Picture” (PiP).
VIPDEMO
The FMS6501 is configured via an I
interface. To facilitate demonstration, Fairchild Semicon-
ductor had developed the VIPDEMO
trol software to write to the FMS6501 register map. This
software is included in the FMS6501DEMO kit. Also
included is a parallel port I
cable to connect to the demo board. Besides using the
full FMS6501 interface, the VIPDEMO
used to control single-register read and writes for I
TM
Control Software
2
C adapter and an interface
2
C-compatible digital
TM
TM
GUI-based con-
www.fairchildsemi.com
can also be
2
C.