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AD8202 Arkusz danych(PDF) 9 Page - Analog Devices

Numer części AD8202
Szczegółowy opis  High Common-Mode Voltage, Single-Supply Difference Amplifier
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD8202 Arkusz danych(HTML) 9 Page - Analog Devices

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AD8202
Rev. A | Page 9 of 12
APPLICATIONS
The AD8202 difference amplifier is intended for applications
where it is required to extract a small differential signal in the
presence of large common-mode voltages. The input resistance
is nominally 170 kΩ, and the device can tolerate common-mode
voltages higher than the supply voltage and lower than ground.
The open collector output stage sources current to within
20 mV of ground and to within 200 mV of VS.
CURRENT SENSING
High-Line, High Current Sensing
Basic automotive applications making use of the large common-
mode range are shown in Figure 2 and Figure 3. The capability
of the device to operate as an amplifier in primary battery sup-
ply circuits is shown in Figure 2; Figure 3 illustrates the ability
of the device to withstand voltages below system ground.
Low Current Sensing
The AD8202 can also be used in low current sensing applications,
such as the 4 to 20 mA current loop shown in Figure 15. In such
applications, the relatively large shunt resistor can degrade the
common-mode rejection. Adding a resistor of equal value on the
low impedance side of the input corrects for this error.
5V
OUTPUT
10
1%
10
1%
NC = NO CONNECT
+
GND
NC
–IN
+IN
A1
+VS
A2
OUT
AD8202
Figure 15. 4 to 20 mA Current Loop Receiver
GAIN ADJUSTMENT
The default gain of the preamplifier and buffer are ×10 and ×2,
respectively, resulting in a composite gain of ×20. With the
addition of external resistor(s) or trimmer(s), the gain may be
lowered, raised, or finely calibrated.
Gains Less than 20
Since the preamplifier has an output resistance of 100 kΩ, an
external resistor connected from Pins 3 and 4 to GND decreases
the gain by a factor REXT/(100 kΩ + REXT) (see Figure 16).
10k
10k
100k
A2
A1
GND
–IN
OUT
+VS
NC
+IN
AD8202
OUT
+VS
REXT
VCM
VDIFF
2
GAIN =
20REXT
REXT + 100kΩ
REXT = 100kΩ
GAIN
20 – GAIN
VDIFF
2
NC = NO CONNECT
Figure 16. Adjusting for Gains Less than 20
The overall bandwidth is unaffected by changes in gain by using
this method, although there may be a small offset voltage due to
the imbalance in source resistances at the input to the buffer. In
many cases this can be ignored, but if desired, it can be nulled
by inserting a resistor equal to 100 kΩ minus the parallel sum of
REXT and 100 kΩ, in series with Pin 4. For example, with REXT =
100 kΩ (yielding a composite gain of ×10), the optional offset
nulling resistor is 50 kΩ.
Gains Greater than 20
Connecting a resistor from the output of the buffer amplifier to
its noninverting input, as shown in Figure 17, increases the gain.
The gain is now multiplied by the factor REXT/(REXT − 100 kΩ);
for example, it is doubled for REXT = 200 kΩ. Overall gains as
high as 50 are achievable in this way. Note that the accuracy of
the gain becomes critically dependent on the resistor value at
high gains. Also, the effective input offset voltage at Pin 1 and
Pin 8 (about six times the actual offset of A1) limits the part’s
use in high gain, dc-coupled applications.
10k
10k
100k
A2
A1
GND
–IN
OUT
+VS
NC
+IN
AD8202
OUT
+VS
REXT
VCM
VDIFF
2
GAIN =
20REXT
REXT – 100kΩ
REXT = 100kΩ
GAIN
GAIN – 20
VDIFF
2
NC = NO CONNECT
Figure 17. Adjusting for Gains Greater than 20


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