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AN-1302
APPLICATION NOTE
One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
Optimizing the ADuCM350 for 4-Wire, Bio-Isolated
Impedance Measurement Applications
Rev. 0 | Page 1 of 16
INTRODUCTION
The ADuCM350 is an ultralow power, integrated mixed-signal
metering solution that includes a microcontroller subsystem for
processing, control, and connectivity. The processor subsystem
is based on a low power ARM® Cortex™-M3 processor, a
collection of digital peripherals, embedded SRAM and flash
memory, and an analog subsystem which provides clocking,
reset, and power management capability.
The ADuCM350 has the ability to perform a 2048 point single
frequency discrete Fourier transform (DFT). It takes the 16-bit
ADC output as input and outputs the real and imaginary parts
of the complex impedance.
The configurable switch matrix on the ADuCM350 allows
you to choose from a 2-wire, 3-wire, or 4-wire impedance
measurement.
This application note details how to set up the ADuCM350 to
optimally measure the impedance of an RC type sensor, using
4-wire techniques, while targeting IEC-60601 standards.
To target the IEC-60601 standard, the ADuCM350 is used
in conjunction with an external instrumentation amplifier
(AD8226), to complete high precision absolute measurements
using a 4-wire measurement technique.
12168-101
Figure 1. EVAL-ADuCM350EBZ Motherboard and 4-Wire Bio-configuration Daughter Board
Verzeichnis
- ・ Blockdiagramm on Seite 8 Seite 14 Seite 15
- ・ Anwendungsbereich on Seite 1
