hmp8156a Intersil Corporation, hmp8156a Datasheet - Page 32

• Manufacturer Part Number: hmp8156a
• Description: Ntsc/pal Video Encoder
• Manufacturer: Intersil Corporation

For proper operation, power supply decoupling is required. It
should be done using a 0.1µF ceramic capacitor in parallel
with a 0.01µF 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.
GND
VCC
32
FERRITE
FIGURE 36. EXAMPLE POWER AND GROUND PLANES
BEAD
FIGURE 36B. COMMON GROUND PLANE
FIGURE 36A. V
AA
HMP8154, HMP8156A
pins to
BULK AREA
CAPACITOR
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
November 4, 2005
4343.4