ADV7120KSTZ30 Просмотр технического описания (PDF) - Analog Devices

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ADV7120KSTZ30

CMOS 80 MHz, Triple 8-Bit Video DAC

Analog Devices 

ADV7120

PC BOARD LAYOUT CONSIDERATIONS

The ADV7120 is optimally designed for lowest noise perfor-

mance, both radiated and conducted noise. To complement the

excellent noise performance of the ADV7120, it is imperative

that great care be given to the PC board layout. Figure 8 shows

a recommended connection diagram for the ADV7120.

The layout should be optimized for lowest noise on the

ADV7120 power and ground lines. This can be achieved by

shielding the digital inputs and providing good decoupling. The

lead length between groups of VAA and GND pins should by

minimized so as to minimize inductive ringing.

Ground Planes

The ADV7120 and associated analog circuitry, should have a

separate ground plane referred to as the analog ground plane.

This ground plane should connect to the regular PCB ground

plane at a single point through a ferrite bead, as illustrated in

Figure 8. This bead should be located as close as possible

(within 3 inches) to the ADV7120.

The analog ground plane should encompass all ADV7120

ground pins, voltage reference circuitry, power supply bypass

circuitry, the analog output traces and any output amplifiers.

The regular PCB ground plane area should encompass all the

digital signal traces, excluding the ground pins, leading up to

the ADV7120.

VIDEO

DATA

INPUTS

VIDEO

CONTROL

INPUTS

COMP

R0

R7

VAA

G0

G7

B0

B7

VREF

ADV7120

GND

CLOCK

FS ADJUST

IOR

REF WHITE

SYNC

IOG

ISYNC

BLANK

IOB

C6

0.1µF

ANALOG POWER PLANE

C3

0.1µF

C4

0.1µF

RSET

R1

R2

560Ω

75Ω

75Ω

C5

0.1µF

L1 (FERRITE BEAD)

+5V (VCC)

Z1 (AD589)

ANALOG GROUND PLANE

R3

75Ω

C2

10µF

C1

33µF

L2 (FERRITE BEAD)

GROUND

RGB

VIDEO

OUTPUT

COMPONENT

C1

C2

C3, C4, C5, C6

L1, L2

R1, R2, R3

RsSEeTt

Z1

DESCRIPTION

33µF TANTALUM CAPACITOR

10µF TANTALUM CAPACITOR

0.1µF CERAMIC CAPACITOR

FERRITE BEAD

75Ω 1% METAL FILM RESISTOR

560Ω 1% METAL FILM RESISTOR

1.235V VOLTAGE REFERENCE

VENDOR PART NUMBER

FAIR-RITE 274300111 OR MURATA BL01/02/03

DALE CMF-55C

DALE CMF-55C

ANALOG DEVICES AD589JH

Figure 8. ADV7120 Typical Connection Diagram and Component List

–10–

REV. B

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