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AD7171 Datasheet(PDF) 13 Page - Analog Devices

Part No. AD7171
Description  16-Bit, Low Power, Sigma-Delta ADC
Download  17 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7171 Datasheet(HTML) 13 Page - Analog Devices

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AD7171
Data Sheet
Rev. C | Page 12 of 16
GROUNDING AND LAYOUT
Because the analog input and reference input of the ADC are
differential, most of the voltages in the analog modulator are
common-mode voltages. The excellent common-mode reject-
ion of the device removes common-mode noise on these inputs.
The digital filter provides rejection of broadband noise on the
power supply, except at integer multiples of the modulator
sampling frequency. The digital filter also removes noise from
the analog and reference inputs provided that these noise sources
do not saturate the analog modulator. As a result, the AD7171 is
more immune to noise interference than conventional high
resolution converters. However, because the noise levels from
the AD7171 are so low, care must be taken with regard to
grounding and layout.
The printed circuit board that houses the AD7171 should be
designed such that the analog and digital sections are separated
and confined to certain areas of the board. A minimum etch
technique is generally best for ground planes because it gives
the best shielding.
It is recommended that the GND pin of the AD7171 be tied to
the analog ground (AGND) plane of the system. In any layout,
it is important that the user pay attention to the flow of currents
in the system, and ensure that the return paths for all currents
are as close as possible to the paths the currents took to reach
their destinations. Avoid forcing digital currents to flow through
the AGND sections of the layout.
The ground plane of the AD7171 should be allowed to run under
the AD7171 to prevent noise coupling. The power supply lines
to the AD7171 should use as wide a trace as possible to provide
low impedance paths and reduce the effects of glitches on the
power supply line. Fast switching signals such as clocks should
be shielded with digital ground to avoid radiating noise to other
sections of the board, and clock signals should never be run near
the analog inputs. Avoid crossover of digital and analog signals.
Traces on opposite sides of the board should run at right angles
to each other. This reduces the effects of feedthrough through the
board. A microstrip technique is by far the best, but it is not
always possible with a double-sided board. In this technique,
the component side of the board is dedicated to ground planes,
while signals are placed on the solder side.
Good decoupling is important when using high resolution ADCs.
VDD should be decoupled with 10 µF tantalum capacitors in parallel
with 0.1 µF capacitors to GND, with the analog ground to digital
ground (DGND) connection of the system being close to the
AD7171. To achieve the best results from these decoupling
components, they should be placed as close as possible to
the device, ideally right up against the device. All logic chips
should be decoupled with 0.1 µF ceramic capacitors to DGND.


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