Datasheet ADS1015

Shunt Voltage (mV)
Measurement Error ()
-50 -40 -30 -20 -10 0 10 20 30 40 50
-2
-1.75
-1.5
-1.25
-1
-0.75
-0.5
-0.25
0
0.25
0.5
0.75
1
1.25
1.5
1.75
2
D005
Including all errors
Excluding resistor errors
Excluding resistor errors, after offset calibration
Shunt Voltage (mV)
Measured Output (mV)
-60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60
-250
-200
-150
-100
-50
0
50
100
150
200
250
D004
35
ADS1013 , ADS1014 , ADS1015
www.ti.com SBAS473E –MAY 2009–REVISED JANUARY 2018
Product Folder Links: ADS1013 ADS1014 ADS1015
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9.2.2.8 Results Summary
A precision voltage source is used to sweep V
SHUNT
from –50 mV to +50 mV. The application circuit produces a
differential voltage of –250 mV to +250 mV across the ADC inputs. Figure 30 and Figure 31 show the
measurement results. The measurements are taken at T
A
= 25°C. Although 1% tolerance resistors are used, the
exact value of these resistors are measured with a Fluke 4.5 digit multimeter to exclude the errors due to
inaccuracy of these resistors. In Figure 30, the x-axis represents V
SHUNT
and the black line represents the
measured digital output voltage in mV. In Figure 31, the x-axis represents V
SHUNT
, the black line represents the
total measurement error in %, the blue line represents the total measurement error in % after excluding the
errors from precision resistors and the green line represents the total measurement error in % after excluding the
errors from precision resistors and performing a system offset calibration with V
SHUNT
= 0 V. Table 10 shows a
results summary.
(1) T
A
= 25°C, not accounting for inaccuracy of shunt resistor.
Table 10. Results Summary
(1)
PARAMETER VALUE
Total error, including errors from 1% precision resistors 1.89%
Total error, excluding errors from 1% precision resistors 0.17%
Total error, after offset calibration, excluding errors from 1% precision resistors 0.11%
9.2.3 Application Curves
Figure 30. Measured Output vs Shunt Voltage (V
SHUNT
)
Figure 31. Measurement Error vs Shunt Voltage (V
SHUNT
)