參數(shù)資料
型號： AD7621ASTRL
廠商： ANALOG DEVICES INC
元件分類： ADC
英文描述： 16-Bit, 1 LSB INL, 3 MSPS PulSAR ADC
中文描述： 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, PQFP48
封裝： MO-026-BBC, LQFP-48
文件頁數(shù)： 25/26頁
文件大小： 265K
代理商： AD7621ASTRL
REV. Pr D
PRELIMINARY TECHNICAL DATA
AD7621
–25–
APPLICATION HINTS
Layout
The AD7621 has very good immunity to noise on the
power supplies. However, care should still be taken with
regard to grounding layout.
The printed circuit board that houses the AD7621
should be designed so the analog and digital sections
are separated and confined to certain areas of the board.
This facilitates the use of ground planes that can be
easily separated. Digital and analog ground planes
should be joined in only one place, preferably under-
neath the AD7621, or, at least, as close as possible to the
AD7621. If the AD7621 is in a system where multiple
devices require analog to digital ground connections,
the connection should still be made at one point only, a
star ground point, which should be established as close
as possible to the AD7621.
It is recommended to avoid running digital lines under the
device as these will couple noise onto the die. The analog
ground plane should be allowed to run under the
AD7621 to avoid noise coupling. Fast switching signals
like
CNVST
or clocks should be shielded with digital
ground to avoid radiating noise to other sections of the
board, and should never run near analog signal paths.
Crossover of digital and analog signals should be
avoided. Traces on different but close layers of the board
should run at right angles to each other. This will reduce
the effect of feedthrough through the board. The power
supply lines to the AD7621 should use as large a trace as
possible to provide low impedance paths and reduce the
effect of glitches on the power supply lines. Good decou-
pling is also important to lower the supplies impedance
presented to the AD7621 and reduce the magnitude of
the supply spikes. Decoupling ceramic capacitors, typi-
cally 100 nF, should be placed on each power supplies
pins AVDD, DVDD and OVDD close to, and ideally
right up against these pins and their corresponding
ground pins. Additionally, low ESR 10 μF capacitors
should be located in the vicinity of the ADC to further
reduce low frequency ripple.
The DVDD supply of the AD7621 can be either a
separate supply or come from the analog supply,
AVDD, or from the digital interface supply, OVDD.
When the system digital supply is noisy, or fast switching
digital signals are present, it is recommended if no sepa-
rate supply available, to connect the DVDD digital
supply to the analog supply AVDD through an RC filter
as shown in Figure 5, and connect the system supply to the
interface digital supply OVDD and the remaining digital
circuitry. When DVDD is powered from the system sup-
ply, it is useful to insert a bead to further reduce
high-frequency spikes.
The AD7621 has four different ground pins; REFGND,
AGND, DGND, and OGND. REFGND senses the refer-
ence voltage and should be a low impedance return to
the reference because it carries pulsed currents. AGND
is the ground to which most internal ADC analog sig-
nals are referenced. This ground must be connected with
the least resistance to the analog ground plane. DGND
must be tied to the analog or digital ground plane depend-
ing on the configuration. OGND is connected to the
digital system ground.
The layout of the decoupling of the reference voltage is
important. The decoupling capacitor should be close to
the ADC and connected with short and large traces to
minimize parasitic inductances.
Evaluating the AD7621 Performance
A recommended layout for the AD7621 is outlined in the
documentation of the
, evaluation
includes a fully assembled and tested evaluation board,
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