Datasheet

+
ADC141S626
V
REF
+IN
-IN
GND
V
A
SCLK
D
OUT
0.1 PF
10 PF
0.1 PF
+
10 PF
+5V
V
IO
CSB
V
CM
OUT
+5V
GND
I
IN
I
OUT
2.5V
2.5V + 2.0V
I
IN
I
OUT
LTSR-1513¶V
LM4132-2.0
ADC
Serial
Interface
ADC141S626
SNAS434B NOVEMBER 2007REVISED MARCH 2013
www.ti.com
Current Sensing Application
Figure 46 shows an example of interfacing a current transducer to the ADC141S626. The current transducer
converts an input current into a voltage that is converted by the ADC. Since the output voltage of the current
transducer is single-ended and centered around a common-mode voltage (V
CM
) of 2.5V, the ADC141S626 is
configured with the output of the transducer driving the non-inverting input and V
CM
of the transducer driving the
inverting input. The output of the transducer has an output range of ±2V around V
CM
of 2.5V. As a result, a series
reference voltage of 2.0V is connected to the ADC141S626. This will allow all of the codes of the ADC141S626
to be available for the application. This configuration of the ADC141S626 is referred to as a single-ended
application of a differential ADC. All of the elements in the application are conveniently powered by the same
+5V power supply, keeping circuit complexity and cost to a minimum.
Figure 46. Interfacing the ADC141S626 to a Current Transducer
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