Datasheet

LARGE INPUT SIGNALS
20kW100kW
40kW100kW
40kW
V+
V-
SENSE
REF2
REF1
+IN
-IN
INA159
V
10V
IN
±
OUT
ADS1225
VREFP
VREFN
START
DRDY/DOUT
AVDD DVDD
GND
AINP1
MSP430xxx
or Cm
GND
+5V
+5V
10 Fm 0.1 Fm
0.1 Fm
AINN1
+3V
+3V
0.1 Fm
1 Fm
SCLK
MODE
TEMPEN
BUFEN
1kW
ADS1225
ADS1226
www.ti.com ....................................................................................................................................................... SBAS346C – MAY 2006 – REVISED JANUARY 2009
Figure 33 shows a basic schematic. The negative
input of the INA159 is grounded while the positive
Many industrial applications require measurement of
input is allowed to swing from – 10V to +10V.
signals that go beyond 5V. The ADS1225 can be
Similarly, the negative input of the ADS1225 is
used to measure large input signals with the help of
grounded while the positive input swings from 0.5V to
an INA159. The precision, level translation differential
+4.5V given the useful V
OUT
swing of the INA159.
amplifier converts a ± 10V input to a 5V input scale.
The larger signal is easily measured without the need
This design allows systems to be run from a single
for extra ± 10V supplies. See the INA159 data sheet
5V supply without the need for higher voltage
for additional details.
supplies for signal conditioning.
Figure 33. With the Help of an INA159, the ADS1225 Measures ± 10V Signals
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Product Folder Link(s): ADS1225 ADS1226