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參數(shù)資料
| 型號(hào)： | ADV7128KR80 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | CMOS 80 MHz, 10-Bit Video DAC |
| 中文描述： | PARALLEL, WORD INPUT LOADING, 10-BIT DAC, PDSO28 |
| 封裝： | SOIC-28 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 135K |
| 代理商： | ADV7128KR80 |
ADV7128
REV. 0
–7–
DAC
Z
O
= 75
(CABLE)
Z
= 75
(SOURCE
TERMINATION)
AD848
+V
S
0.1
μ
F
0.1
μ
F
I
OUT
75
2
7
6
4
3
Z
2
Z
L
= 75
(MONITOR)
GAIN (G) = 1+
–V
S
Z
1
Z
1
Z
2
Figure 6. AD848 As an Output Buffer
PC Board Layout Considerations
T he ADV7128 is optimally designed for lowest noise perfor-
mance, both radiated and conducted noise. T o complement the
excellent noise performance of the ADV7128 it is imperative
that great care be given to the PC board layout. Figure 7 shows
a recommended connection diagram for the ADV7128.
T he layout should be optimized for lowest noise on the
ADV7128 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 be
minimized so as to minimize inductive ringing.
Ground Planes
T he ADV7128 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 7. T his bead should be located as close as possible
(within 3 inches) to the ADV7128.
T he analog ground plane should encompass all ADV7128
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 ADV7128.
Power Planes
T he PC board layout should have two distinct power planes,
one for analog circuitry and one for digital circuitry. T he analog
power plane should encompass the ADV7128 (V
AA
) and all as-
sociated analog circuitry. T his power plane should be connected
to the regular PCB power plane (V
CC
) at a single point through
a ferrite bead, as illustrated in Figure 7. T his bead should be lo-
cated within three inches of the ADV7128.
T he PCB power plane should provide power to all digital logic
on the PC board, and the analog power plane should provide
power to all ADV7128 power pins, voltage reference circuitry
and any output amplifiers.
T he PCB power and ground planes should not overlay portions
of the analog power plane. K eeping the PCB power and ground
planes from overlaying the analog power plane will contribute to
a reduction in plane-to-plane noise coupling.
Supply Decoupling
Noise on the analog power plane can be further reduced by the
use of multiple decoupling capacitors. (See Figure 7.)
Optimum performance is achieved by the use of 0.1
μ
F ceramic
capacitors. Each of the two groups of V
AA
should be individually
decoupled to ground. T his should be done by placing the ca-
pacitors as close as possible to the device with the capacitor
leads as short as possible, thus minimizing lead inductance.
GND
RSET
I
OUT
GROUND
ADV7128
C3
0.1
μ
F
C5
0.1
μ
F
Z1
(AD589)
ANALOG GROUND PLANE
R1
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)
D0
D9
CLOCK
VIDEO
OUTPUT
VIDEO
DATA
INPUTS
C4
0.1
μ
F
R
SET
560
L1 (FERRITE BEAD)
CC
+5V (V )
VENDOR PART NUMBER
FAIR-RITE 274300111 OR
MURATA BL01/02/03
DALE CMF-55C
DALE CMF-55C
ANALOG DEVICES AD589JH
COMPONENT
C1
C2
C3, C4, C5,C6
L1, L2
R1
R
SET
DESCRIPTION
33
μ
F TANTALUM CAPACITOR
10
μ
F TANTALUM
0.1
μ
F CERAMIC CAPACITOR
FERRITE BEAD
75
1% METAL FILM RESISTOR
560
1% METAL FILM RESISTOR
1.235V VOLTAGE REFERENCE
Figure 7. ADV7128 Typical Connection Diagram and Component List
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PDF描述 |
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| ADV7128 | 80 MHz, 10-Bit Video DAC(80MHz,10位視頻D/A轉(zhuǎn)換器) |
| ADV7150 | CMOS 220 MHz True-Color Graphics Triple 10-Bit Video RAM-DAC(三通道,10位視頻RAM-D/A轉(zhuǎn)換器) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADV7128KR80-REEL | 制造商:Analog Devices 功能描述:DAC 1-CH Segment 10-bit 28-Pin SOIC W T/R 制造商:Rochester Electronics LLC 功能描述:SINGLE,10-BIT VIDEO DAC - Tape and Reel |
| ADV7128KRZ30 | 制造商:Analog Devices 功能描述:DAC 1-CH Segment 10-bit 28-Pin SOIC W |
| ADV7128KRZ50 | 制造商:Analog Devices 功能描述:DAC 1-CH Segment 10-bit 28-Pin SOIC W |
| ADV7128KRZ80 | 制造商:Analog Devices 功能描述:DAC 1-CH Segment 10-bit 28-Pin SOIC W 制造商:Analog Devices 功能描述:SGLE 10B VIDEO DAC |
| ADV7129 | 制造商:AD 制造商全稱:Analog Devices 功能描述:192-Bit, 360 MHz True-Color Video DAC with Onboard PLL |
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