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參數資料
| 型號： | ADV7120KP80 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | CMOS 80 MHz, Triple 8-Bit Video DAC |
| 中文描述： | TRIPLE, PARALLEL, 8 BITS INPUT LOADING, 8-BIT DAC, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數： | 10/12頁 |
| 文件大小： | 188K |
| 代理商： | ADV7120KP80 |
ADV7120
REV. B
–10–
PC BOARD LAY OUT CONSIDE RAT IONS
T he ADV7120 is optimally designed for lowest noise perfor-
mance, both radiated and conducted noise. T o 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.
T he layout should be optimized for lowest noise on the
ADV7120 power and ground lines. T his can be achieved by
shielding the digital inputs and providing good decoupling. T he
lead length between groups of V
AA
and GND pins should by
minimized so as to minimize inductive ringing.
Ground Planes
T he ADV7120 and associated analog circuitry, should have a
separate ground plane referred to as the analog ground plane.
T his ground plane should connect to the regular PCB ground
plane at a single point through a ferrite bead, as illustrated in
Figure 8. T his bead should be located as close as possible
(within 3 inches) to the ADV7120.
T he analog ground plane should encompass all ADV7120
ground pins, voltage reference circuitry, power supply bypass
circuitry, the analog output traces and any output amplifiers.
T he regular PCB ground plane area should encompass all the
digital signal traces, excluding the ground pins, leading up to
the ADV7120.
GND
FS ADJUST
IOR
IOG
IOB
GROUND
ADV7120
C3
0.1
μ
F
C5
0.1
μ
F
Z1 (AD589)
R1
75
R2
75
R3
75
C1
33
μ
F
C2
10
μ
F
COMP
C6
0.1
μ
F
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
C4
0.1
μ
F
R
SET
560
L1 (FERRITE BEAD)
+5V (V
CC
)
I
SYNC
Rset
Z1
COMPONENT
C1
C2
C3, C4, C5, C6
L1, L2
R1, R2, R3
DESCRIPTION
33
μ
F TANTALUM CAPACITOR
10
μ
F TANTALUM CAPACITOR
0.1
μ
F CERAMIC CAPACITOR
FERRITE BEAD
75
1% METAL FILM RESISTOR
560
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
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