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ADV7120KPZ30 查看數據表(PDF) - Analog Devices

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ADV7120KPZ30 CMOS 80 MHz, Triple 8-Bit Video DAC ADI
Analog Devices ADI
ADV7120KPZ30 Datasheet PDF : 12 Pages
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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
560
75
75
C5
0.1µF
L1 (FERRITE BEAD)
+5V (VCC)
Z1 (AD589)
ANALOG GROUND PLANE
R3
75
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
751% METAL FILM RESISTOR
5601% 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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