HMP8156ACNZ【PDF 26/34 页】IC VIDEO ENCODER NTSC/PAL 64MQFP

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Sheet目录1996

22页 23页 24页 25页 [26页]27页 28页 29页 30页

FN4343.5

August 20, 2009

For proper operation, power supply decoupling is required. It

should be done using a 0.1

μF ceramic capacitor in parallel

with a 0.01

μF chip capacitor for each group of V

AA pins to

ground. These capacitors should be located as close to the

VAA and GND pins as possible, using short, wide traces.

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

the VAA pins exceeds 200mV. About 10% of the noise (that is

less than 1MHz) on the VAA pins will couple onto the analog

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.

FIGURE 36A. VCC AND VAA PLANES

FIGURE 36B. COMMON GROUND PLANE

FIGURE 36. EXAMPLE POWER AND GROUND PLANES

VCC

VAA

FERRITE

BEAD

BULK AREA

CAPACITOR

8154/8156A

PCB

ANALOG

FILTERS

CONN.

GND

8154/8156A

PCB

ANALOG

FILTERS

CONN.

HMP8154, HMP8156A

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