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參數(shù)資料
| 型號： | AD9005B |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 12-Bit, 10 MSPS A/D Converter(12位,10MSPS A/D轉換器) |
| 中文描述： | 12位，10 MSPS的A / D轉換（12位，高達10MSPS的A / D轉換器） |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 160K |
| 代理商： | AD9005B |
AD9005B
–7–
REV. 0
Layout Information
The accuracy of a 12-bit converter, especially one with the dy-
namic performance level of the AD9005B, requires that design-
ers pay careful attention to printed circuit board layouts. Analog
signal paths should be impedance matched, with termination/
load resistors at or near package connections. Analog signal
paths should also be isolated from digital signal paths. Other-
wise digital signals can be capacitively coupled into the analog
section of the circuit, degrading the overall performance of the
A/D converter.
Digital switching noise on power supplies can also degrade
converter performance. Because of this noise (inherent with
TTL logic), the digital power supplies of the AD9005B should
be separated from the analog power supplies. In addition, each
power supply should be capacitively decoupled to ground. To
accomplish this, a single large value capacitor with a high reso-
nant frequency (a 10
μ
F tantalum capacitor for example) should
be used on each of the AD9005B’s power supplies, at or near
the package. In addition, a lower value capacitor with good high
frequency characteristics (a 0.1
μ
F ceramic chip capacitor is
recommended) should be connected to each power supply pin
connection.
For applications in which only single +5 V and/or –5.2 V sup-
plies are available, a ferrite bead, placed in series between the
analog and digital power pins, can be used to isolate the digital
noise from the analog circuits.
Noise on the circuit ground is often the limiting factor in A/D
converter performance. Perhaps the most critical concerns of
circuit layout are the ground connections. To reduce ground
noise, a two-sided printed circuit board is recommended, the
component side being reserved (as much as possible) for a
single, low impedance ground plane. The other side should be
used for all (possible) power and signal connections. Each of the
ground connections of the AD9005B should be connected to
the ground plane, and most of the area under the AD9005B
should be part of this ground plane. The metal case of the
AD9005B is connected to ground.
Operation of the AD9005B requires that Pin 4, the output of
the internal track-and-hold, be connected to Pin 5, the input to
the AD9005B’s A/D converter circuitry. A suggested layout,
illustrating this connection, is shown below.
A final suggestion regarding circuit layout concerns the use of
sockets. Ideally, parts should be soldered into boards in final
designs. If sockets must be used, individual pin sockets are
recommended to avoid lead inductance and capacitive coupling
between adjacent pins. Pin sockets are available from Amp, part
#6-330808-0.
SUGGESTED LAYOUT
Figure 5. GND Plane Side
(As Viewed from Top)
Figure 6. Solder Side
(As Viewed from Top)
Figure 7. Component Mounting
(As Viewed from Top)
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| AD9022AQ | 12-Bit 20 MSPS Monolithic A/D Converter |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD9005BKM | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 12-Bit |
| AD9005BTM | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 12-Bit |
| AD9005KM | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 12-Bit |
| AD9005KM/PCB | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD9005TM | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 12-Bit |
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