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AD7171 Arkusz danych(PDF) 3 Page - Analog Devices

Numer części AD7171
Szczegółowy opis  Low Cost, Level Shifted Low Side Current Monitor for Negative High Voltage Rails
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
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AD7171 Arkusz danych(HTML) 3 Page - Analog Devices

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Circuit Note
CN-0188
Rev. B | Page 3 of 5
PCB Layout Considerations
In any circuit where accuracy is crucial, it is important to
consider the power supply and ground return layout on the
board. The PCB should isolate the digital and analog sections as
much as possible. This PCB was constructed in a four layer
stack up with large area ground plane layers and power plane
polygons. See the MT-031 Tutorial for more discussion on
layout and grounding and the MT-101 Tutorial for information
on decoupling techniques.
The power supply to the AD7171 and ADuM5402 should be
decoupled with 10 µF and 0.1 µF capacitors to properly suppress
noise and reduce ripple. The capacitors should be placed as
close to the device as possible with the 0.1 µF capacitor having a
low ESR value. Ceramic capacitors are advised for all high
frequency decoupling.
Care should be taken in considering the isolation gap between
the primary and secondary sides of the ADuM5402. The
EVAL-CN0188-SDPZ board maximizes this distance by pulling
back any polygons or components on the top layer and aligning
them with the pins on the ADuM5402.
Power supply lines should have as large a trace width as possible
to provide low impedance paths and reduce glitch effects on the
supply line. Clocks and other fast switching digital signals
should be shielded from other parts of the board by digital
ground.
A complete design support package for this circuit note,
including board layouts, can be found at
http://www.analog.com/CN0188-DesignSupport.
COMMON VARIATIONS
There are a number of solutions available for high-side sensing
of positive sources. IC solutions using current sense amplifiers,
difference amplifiers, or a combination of these are available.
“High-Side Current Sensing: Difference Amplifier vs, Current-
Sense Amplifier,” Analog Dialogue, January 2008, describes the
use of current sense and difference amplifiers. The article is
available at www.analog.com/HighSide_CurrentSensing.
The following URLs link to Analog Devices products which are
useful in solving the current sense problem:
Current sense amplifiers: www.analog.com/CurrentSenseAmps
Difference amplifiers: www.analog.com/DifferenceAmps
Instrumentation amplifiers: www.analog.com/InstrumentationAmps
Figure3.AlternateGalvanicallyIsolatedNegativeRailCurrentSenseCircuitPoweredDirectlyfrom−48VSourceandADuM5402Isolator(AllConnectionsandDecouplingNotShown)
SCLK
PDRST
DOUT
VDD
GND
REFIN(+)
AIN+
AIN−
GNDISO
+3.3VISO
+3.3VISO
GNDISO
GNDISO
ADR381
VIN
VOUT
GND
LOAD
SOURCE
+
−48V
+2.5V
+
VSHUNT
RSHUNT
ILOAD
AD7171
R2
1kΩ
1%
R4
1kΩ
1%
48.7kΩ, 1%
U1
U1:
ADA4051-1
REFIN(–)
R3*
GNDISO
R1*
1.24MΩ
1%
VOA
VIA
VOB
VIC
VOC
VIB
VDD1
GND1
GNDISO
GND1
GNDISO
VISO
+3.3V
ADuM5402
*R1 ADDS 100mV OFFSET TO U1 OUTPUT
AND ALLOWS MEASUREMENT AT ZERO LOAD CURRENT.
IF R1 IS USED, REDUCE R3 T
O 46.4kΩ TO MAINTAIN 2.5V FULL-SCALE


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