HMP8154 Intersil Corporation, HMP8154 Datasheet - Page 32

• Manufacturer Part Number: HMP8154
• Description: Ntsc/pal Encoders
• Manufacturer: Intersil Corporation

For proper operation, power supply decoupling is required. It
should be done using a 0.1 F ceramic capacitor in parallel
with a 0.01 F chip capacitor for each group of V
ground. These capacitors should be located as close to the
V
If a separate linear regulator is used to provide power to the
HMP8154/HMP8156A power plane, the power-up sequence
should be designed to ensure latchup will not occur. A separate
linear regulator is recommended if the power supply noise on
AA
and GND pins as possible, using short, wide traces.
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GND
VCC
32
FERRITE
FIGURE 36. EXAMPLE POWER AND GROUND PLANES
BEAD
FIGURE 36B. COMMON GROUND PLANE
FIGURE 36A. V
AA
HMP8154, HMP8156A
BULK AREA
CAPACITOR
pins to
VAA
CC
8154/8156A
8154/8156A
AND V
the V
less than 1MHz) on the V
outputs.
External Reference Voltage
If an external reference voltage is used, its circuitry should
receive power from the same plane as the HMP8154/
HMP8156A. 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 37.
AA
AA
PLANES
pins exceeds 200mV. About 10% of the noise (that is
FILTERS
FILTERS
LP
LP
AA
ANALOG
ANALOG
CONN.
CONN.
pins will couple onto the analog
PCB
PCB