ADV101_15 datasheet(10/12 Pages) AD

Part #	ADV101

Description	CMOS 80 MHz, Triple 8-Bit Video DAC

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ADV101

–10–

REV. B

PC BOARD LAYOUT CONSIDERATIONS

The ADV101 is optimally designed for lowest noise perfor-

mance, both radiated and conducted noise. To complement the

excellent noise performance of the ADV101, it is imperative

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

a recommended connection diagram for the ADV101.

The layout should be optimized for lowest noise on the

ADV101 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 ADV101, 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 ADV101.

The analog ground plane should encompass all ADV101

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 ADV101.

GND

FS ADJUST

IOR

IOG

IOB

GROUND

ADV101

C5

0.1

µF

Z1 (AD589)

R1

75

Ω

R2

75

Ω

R3

75

Ω

C1

33

µF

C2

10

µF

COMP

C6

0.1

µF

ANALOG POWER PLANE

V

AA

V

REF

L2 (FERRITE BEAD)

R0

R7

G0

G7

B0

B7

CLOCK

REF WHITE

SYNC

BLANK

RGB

VIDEO

OUTPUT

VIDEO

DATA

INPUTS

VIDEO

CONTROL

INPUTS

ANALOG GROUND PLANE

RSET

560

Ω

L1 (FERRITE BEAD)

C4

0.1

µF

C3

0.1

µF

CC

5V (V

+

)

R4

1k

Ω

ISYNC

DESCRIPTION

33

µF TANTALUM CAPACITOR

10

µF TANTALUM CAPACITOR

0.1

µF CERAMIC CAPACITOR

FERRITE BEAD

75

Ω 1% METAL FILM RESISTOR

1k

Ω 1% METAL FILM RESISTOR

560

Ω 1% METAL FILM RESISTOR

1.235V VOLTAGE REFERENCE

VENDOR PART NUMBER

FAIR-RITE 27430011 OR MURATA BL01/02/03

DALE CMF-55C

ANALOG DEVICES AD589JH

COMPONENT

C1

C2

C3, C4, C5, C6

L1, L2

R1, R2, R3

R4

Z1

R

SET

Figure 8. Typical Connection Diagram and Component List

OBSOLETE

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