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| 型號： | AD7691BRMZ-RL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 18-Bit, 1.5 LSB INL, 250 kSPS PulSAR Differential ADC in MSOP/QFN |
| 中文描述： | 1-CH 18-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO10 |
| 封裝： | LEAD FREE, MO-187BA, MSOP-10 |
| 文件頁數(shù)： | 24/28頁 |
| 文件大?。?/td> | 682K |
| 代理商： | AD7691BRMZ-RL7 |
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AD7691
APPLICATION HINTS
LAYOUT
The printed circuit board that houses the AD7691 should be
designed so that the analog and digital sections are separated
and confined to certain areas of the board. The pinout of the
AD7691, with all its analog signals on the left side and all its
digital signals on the right side, eases this task.
Rev. 0 | Page 24 of 28
Avoid running digital lines under the device because this couples
noise onto the die unless a ground plane under the AD7691 is
used as a shield. Fast switching signals, such as CNV or clocks,
should not run near analog signal paths. Crossover of digital
and analog signals should be avoided.
At least one ground plane should be used. It could be common
or split between the digital and analog sections. In the latter
case, the planes should be joined underneath the AD7691.
The AD7691 voltage reference input, REF, has a dynamic input
impedance and should be decoupled with minimal parasitic
inductances. This is done by placing the reference decoupling
ceramic capacitor close to, ideally right up against, the REF and
GND pins and connecting them with wide, low impedance traces.
Finally, the power supplies, VDD and VIO, of the AD7691
should be decoupled with ceramic capacitors, typically 100 nF,
placed close to the AD7691 and connected using short and wide
traces to provide low impedance paths and reduce the effect of
glitches on the power supply lines.
An example of a layout following these rules is shown in
Figure 46 and Figure 47.
EVALUATING THE AD7691’S PERFORMANCE
Other recommended layouts for the AD7691 are outlined
in the documentation of the evaluation board for the AD7691
(EVAL-AD7691-CB). The evaluation board package includes
a fully assembled and tested evaluation board, documentation,
and software for controlling the board from a PC via the
EVAL-CONTROL BRD3.
0
Figure 46. Example Layout of the AD7691 (Top Layer)
0
Figure 47. Example Layout of the AD7691 (Bottom Layer)
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