FS401LF ETC2 [List of Unclassifed Manufacturers], FS401LF Datasheet - Page 97

• Manufacturer Part Number: FS401LF
• Description: PC to TV Video Scan Converters
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

FS401, FS403
7.2.6 Video Output Filters
• To reduce step noise on the D/A converter outputs, and to lower EMI, consider placing the 75Ω
7.2.7 Analog Power Supply Bypassing, Filtering, and Isolation
• When possible, it is recommended that the analog supply voltages be fed from a linear voltage
• Noise from the digital plane must be kept isolated from the analog plane. Consider using a 1Ω to 2Ω
• It is recommended that each power supply section be isolated with a ferrite bead and a 4.7µF
7.2.8 Power and Ground
Within the FS400, separate power is routed to functional sections: A/D converters, phase locked loops,
D/A converters, digital processors and digital drivers. To minimize power consumption, a +3.3 volt supply
is used for the external SDRAM interface and the internal line buffers. All ground pins should be
connected to a common ground plane. Power pins should be segregated into analog and digital sections.
Clean analog power should be applied to the V
should be placed adjacent to each group of pins. The capacitor connected to C
be connected to V
recommended.
Digital power may be derived from system digital +3.3 volts. If necessary insert a ferrite bead in series
with the supply trace. A 47 µF capacitor should be placed across the common +3.3 VDC for V
and V
µF capacitor should be located adjacent to V
currents.
JANUARY 24, 2007
termination resistors and the first capacitor of the output filter close to the video output pins of the
FS400.
regulator. Switching power supply noise, and noise from the digital plane can induce visible artifacts
into the displayed video. Always provide sufficient filtering and high frequency bypassing to insure that
power supply noise is minimized for visual as well as EMI reasons.
resistor with a 100µF capacitor as a filter network. The voltage drop to the analog plane is minimal,
and this effectively minimizes clock noise from the digital plane.
capacitor. Where the power pins are so close together that the 0.1µF bypass capacitors are adjacent,
consider changing one of the adjacent capacitors to 100 to 1000pF to reduce higher frequency noise
on the power supply.
DDDA
to act as a reservoir for heavy currents drawn by D/A converters and memory. At least one 0.1
DDDA
to minimize noise at the D/A converter outputs. Chip capacitors are
DD
DDAD
pins along each side of the FS400 to supply transient
, V
97
DDPA
, V
DDPF
COPYRIGHT © 1999 FOCUS ENHANCEMENTS, INC.
, and V
DDDA
pins. A 0.1 µF capacitor
BYPR
PRODUCT SPECIFICATION
is critical, and it must
DD
REV. NO. 1.7
, V
DDAD