hmp8190 Intersil Corporation, hmp8190 Datasheet - Page 30

• Manufacturer Part Number: hmp8190
• Description: Ntsc/pal Video Encoder
• Manufacturer: Intersil Corporation

External Reference Voltage
If an external reference voltage is used, its circuitry should
receive power from the same plane as the
HMP8190/HMP8191. The external VREF must also be
stable and well decoupled from the power plane. An example
VREF circuit using a band gap reference diode is shown in
Figure 27.
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GND
GND
VCC
VCC
30
FERRITE
FERRITE
FIGURE 26. EXAMPLE POWER AND GROUND PLANES
BEAD
BEAD
FIGURE 26B. COMMON GROUND PLANE
FIGURE 26A. V
HMP8190, HMP8191
BULK AREA
BULK AREA
CAPACITOR
CAPACITOR
VAA
VAA
CC
8154/8156A
8154/8156A
AND V
817x
817x
Analog Output Filters
The various video standards specify the frequency response
of the video signal. The HMP8190/HMP8191 uses 2X
oversampling DACs to simplify the reconstruction filter
required. Example post filters are shown in Figure 28. The
analog output filters should be as close as possible to the
HMP8190/HMP8191.
AA
PLANES
FILTERS
FILTERS
FILTERS
FILTERS
LP
LP
LP
LP
ANALOG
ANALOG
ANALOG
ANALOG
CONN.
CONN.
CONN.
CONN.
PCB
PCB
PCB
PCB