adv101 Analog Devices, Inc., adv101 Datasheet - Page 10

• Manufacturer Part Number: adv101
• Description: Cmos 80 Mhz, Triple 8-bit Video Dac
• Manufacturer: Analog Devices, Inc.

ADV101
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 V
minimized so as to minimize inductive ringing.
INPUTS
CONTROL
VIDEO
DATA
INPUTS
VIDEO
C3, C4, C5, C6
COMPONENT
AA
CLOCK
REF WHITE
BLANK
R0
R7
G0
G7
B0
B7
SYNC
Figure 8. Typical Connection Diagram and Component List
R1, R2, R3
and GND pins should by
ADV101
L1, L2
R
SET
C1
C2
R4
Z1
FS ADJUST
COMP
DESCRIPTION
33 F TANTALUM CAPACITOR
10 F TANTALUM CAPACITOR
0.1 F CERAMIC CAPACITOR
FERRITE BEAD
75 1% METAL FILM RESISTOR
1k 1% METAL FILM RESISTOR
560 1% METAL FILM RESISTOR
1.235V VOLTAGE REFERENCE
GND
I
V
SYNC
IOR
IOG
IOB
V
REF
AA
560
R
SET
C3
0.1 F
C6
0.1 F
ANALOG POWER PLANE
75
R1
–10–
C4
0.1 F
75
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.
R2
R4
1k
VENDOR PART NUMBER
FAIR-RITE 27430011 OR MURATA BL01/02/03
DALE CMF-55C
DALE CMF-55C
DALE CMF-55C
ANALOG DEVICES AD589JH
75
R3
ANALOG GROUND PLANE
C5
0.1 F
Z1 (AD589)
C2
10 F
L1 (FERRITE BEAD)
L2 (FERRITE BEAD)
RGB
VIDEO
OUTPUT
C1
33 F
+
GROUND
5V (V
CC
REV. B
)