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AD8210YRZ

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
Data Sheet AD8210
Rev. D | Page 9 of 16
210
0
0
–1
0
1
0
V
OS
DR
IFT
(µ
V
/
°
C
)
COUNT
180
0
150
0
120
0
90
0
60
0
30
0
–
9
–6
–3
0
3
6
9
05147-034
Figure 22. Offset Drift Distribution (µV/°C), SOIC,
Temperature Range = −40°C to +125°C
0
0 20
GAIN DRIFT (ppm/°C)
COUNT
3500
3000
2500
2000
1500
1000
500
3 6 9 12 15 18
05147-035
Figure 23. Gain Drift Distribution (ppm/°C), SOIC,
Temperature = −40°C to +125°C
0
–2.0 2
.
0
V
OS
(m
V)
COUNT
4000
300
0
2000
100
0
–1.5
–1.0 –0.
5
0
0
.
5 1
.0
1
.5
+25
°
C
–40
°
C
+
125°
C
05147-036
Figure 24. Offset Distribution (µV), SOIC, VCM = 5 V
0
–2.0 2.0
V
OS
(mV)
COUNT
4000
3500
3000
2500
2000
1500
1000
500
–1.5
–1.0
–0.5
0 0.5
1.0
1.5
+25°C
–40°C
+125°C
05147-037
Figure 25. Offset Distribution (µV), SOIC, VCM = 0 V
AD8210 Data Sheet
Rev. D | Page 10 of 16
THEORY OF OPERATION
In typical applications, the AD8210 amplifies a small differential
input voltage generated by the load current flowing through a
shunt resistor. The AD8210 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 AD8210.
The AD8210 is comprised of two main blocks, a differential
amplifier and an instrumentation amplifier. A load current
flowing through the external shunt resistor produces a voltage
at the input terminals of the AD8210. The input terminals are
connected to the differential amplifier (A1) by R1 and R2. A1
nulls the voltage appearing across its own input terminals by
adjusting the current through R1 and R2 with Q1 and Q2.
When the input signal to the AD8210 is 0 V, the currents in R1
and R2 are equal. When the differential signal is nonzero, the
current increases through one of the resistors and decreases in
the other. The current difference is proportional to the size and
polarity of the input signal.
The differential currents through Q1 and Q2 are converted
into a differential voltage by R3 and R4. A2 is configured as an
instrumentation amplifier. The differential voltage is converted
into a single-ended output voltage by A2. The gain is internally
set with precision-trimmed, thin film resistors to 20 V/V.
The output reference voltage is easily adjusted by the V
REF
1 pin
and the V
REF
2 pin. In a typical configuration, V
REF
1 is connected
to V
CC
while V
REF
2 is connected to GND. In this case, the output
is centered at V
CC
/2 when the input signal is 0 V.
I
S
HUN
T
R
S
HUN
T
AD8210
V
OU
T
=
(I
SHUN
T
×
R
SHUN
T
) ×
20
A
2
R1
R
2
V
S
V
REF
1
V
RE
F
2
GN
D
05147-004
A
1
R
3 R4
Q
1 Q2
Figure 26. Simplified Schematic
Data Sheet AD8210
Rev. D | Page 11 of 16
MODES OF OPERATION
The AD8210 can be adjusted for unidirectional or bidirectional
operation.
UNIDIRECTIONAL OPERATION
Unidirectional operation allows the AD8210 to measure
currents through a resistive shunt in one direction. The basic
modes for unidirectional operation are ground referenced
output mode and V+ referenced output mode.
In unidirectional operation, the output can be set at the negative
rail (near ground) or at the positive rail (near V+) when the
differential input is 0 V. The output moves to the opposite rail
when a correct polarity differential input voltage is applied. In
this case, full scale is approximately 250 mV. The required
polarity of the differential input depends on the output voltage
setting. If the output is set at ground, the polarity needs to be
positive to move the output up (see Table 5). If the output is set
at the positive rail, the input polarity needs to be negative to
move the output down (see Table 6).
Ground Referenced Output
When using the AD8210 in this mode, both reference inputs
are tied to ground, which causes the output to sit at the negative
rail when the differential input voltage is zero (see Figure 27
and Table 4).
AD
8210
OUTPUT
G = +
20
R
S
+IN –IN
V
S
V
R
EF
1
V
RE
F
2
G
ND
05147-005
0.1
µF
Figure 27. Ground Referenced Output
Table 4. V+ = 5 V
V
IN
(Referred to −IN) V
O
0 V 0.05 V
250 mV
4.9 V
V+ Referenced Output
This mode is set when both reference pins are tied to the
positive supply. It is typically used when the diagnostic scheme
requires detection of the amplifier and wiring before power is
applied to the load (see Figure 28 and Table 5).
AD8210
O
UTP
UT
G
= +2
0
R
S
+IN –
IN
V
S
V
R
EF
1
V
RE
F
2
GND
0
.
1
µ
F
05147-006
Figure 28. V+ Referenced Output
Table 5. V+ = 5 V
V
IN
(Referred to −IN) V
O
0 V 4.9 V
−250 mV 0.05 V
BIDIRECTIONAL OPERATION
Bidirectional operation allows the AD8210 to measure currents
through a resistive shunt in two directions. The output offset
can be set anywhere within the output range. Typically, it is set
at half scale for equal measurement range in both directions. In
some cases, however, it is set at a voltage other than half scale
when the bidirectional current is nonsymmetrical.
Table 6. V+ = 5 V, V
O
= 2.5 V with V
IN
= 0 V
V
IN
(Referred to –IN) V
O
+125 mV 4.9 V
−125 mV 0.05 V
Adjusting the output can also be accomplished by applying
voltage(s) to the reference inputs.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

AD8210YRZ

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Current Sense Amplifiers High Voltage Bidirectional
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