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AD8215WYRZ-R7

P1-P3P4-P6P7-P9P10-P12P13-P14
Data Sheet AD8215
Rev. B | Page 9 of 13
0
0.4
0.8
1.2
1.6
2.0
0 1 2 3 4 5 6 7 8 9 10 11 12
07203-009
OUTPUT SINK CURRENT (mA)
OUTPUT VOLTAGE RANGE (V)
Figure 22. Output Voltage Range from GND vs. Output Sink Current
07203-021
V
OS
(mV)
COUNT
0
–2 0–1 1 2
500
1000
1500
2000
2500
3000
3500
+125°C
+25°C
–40°C
Figure 23. Offset Distribution (V
OS
)
07203-023
GAIN DRIFT (ppm/°C)
COUNT
0
–2–4–6–8–10–12–14–16 0
300
600
900
1200
1500
1800
2100
2400
Figure 24. Gain Drift Distribution
07203-030
OFFSET DRIFT (µV/°C)
COUNT
0
151050–5–10–15–20 20
200
400
600
800
1000
1200
1400
1600
Figure 25. Offset Drift
AD8215 Data Sheet
Rev. B | Page 10 of 13
THEORY OF OPERATION
In typical applications, the AD8215 amplifies a small differential
input voltage generated by the load current flowing through a
shunt resistor. The AD8215 rejects high common-mode voltages
(up to 65 V) and provides a ground-referenced, buffered output
that interfaces with an analog-to-digital converter (ADC).
Figure 26 shows a simplified schematic of the AD8215.
07203-025
V+
OUT =
(I
SHUNT
× R
SHUNT
) × 20
G = +20
AD8215
A1
R1
R
OUT
I
IN
R
PROPRIETARY
OFFSET
CIRCUITRY
GND
I
SHUNT
R
SHUNT
Figure 26. Simplified Schematic
A load current flowing through the external shunt resistor
produces a voltage at the input terminals of the AD8215. R and
R1 connect the input terminals to A1. The inverting terminal,
which has very high input impedance, is held to
(V
CM
) − (I
SHUNT
× R
SHUNT
)
because negligible current flows through R. A1 forces the
noninverting input to the same potential. Therefore, the current
that flows through R1 is equal to
I
IN
= (I
SHUNT
× R
SHUNT
)/R1
This current (I
IN
) is converted back to a voltage via R
OUT
. The
output buffer amplifier has a gain of 20 V/V and offers excellent
accuracy as the internal gain setting resistors are precision trimmed
to within 0.01% matching. The resulting output voltage is equal to
OUT = (I
SHUNT
× R
SHUNT
) × 20
Data Sheet AD8215
Rev. B | Page 11 of 13
APPLICATION NOTES
OUTPUT LINEARITY
In all current sensing applications, and especially in automotive
and industrial environments where the common-mode voltage
can vary significantly, it is important that the current sensor
maintain the specified output linearity, regardless of the input
differential or common-mode voltage. The AD8215 contains
specific circuitry on the input stage, which ensures that even
when the differential input voltage is very small and the
common-mode voltage is also low (below the 5 V supply), the
input-to-output linearity is maintained. Figure 27 shows the
differential input voltage vs. the corresponding output voltage at
different common modes.
200
0
0
07203-
026
DIFFERENTIAL INPUT VOLTAGE (mV)
OUTPUT VOLTAGE (mV)
10
180
160
140
120
100
80
60
40
20
123456789
IDEAL V
OUT
(mV)
V
OUT
(mV) @ V
CM
=0V
V
OUT
(mV) @ V
CM
=65V
Figure 27. Gain Linearity due to Differential and Common-Mode Voltage
Regardless of the common mode, the AD8215 provides a
correct output voltage when the differential input is at least
2 mV, which is due to the voltage range of the output amplifier
that can go as low as 33 mV typical. The specified minimum
output amplifier voltage is 100 mV to provide sufficient guard-
bands. The ability of the AD8215 to work with very small
differential inputs, regardless of the common-mode voltage,
allows more dynamic range, accuracy, and flexibility in any
current sensing application.
P1-P3P4-P6P7-P9P10-P12P13-P14

AD8215WYRZ-R7

Mfr. #:
Buy AD8215WYRZ-R7
Manufacturer:
Analog Devices Inc.
Description:
Current Sense Amplifiers IC High VTG
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