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參數(shù)資料
| 型號： | AD8200 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 運動控制電子 |
| 英文描述： | High Common-Mode Voltage, Single Supply Difference Amplifier |
| 中文描述： | 高共模電壓，單電源差分放大器 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 186K |
| 代理商： | AD8200 |
REV. 0
AD8200
–6–
CURRENT SENSING
High-Line, High-Current Sensing
Basic automotive applications making use of the large common-
mode range are shown in Figures 1 and 2. The capability of the
device to operate as an amplifier in primary battery supply cir-
cuits is shown in Figure 1, Figure 2 illustrates the ability of the
device to withstand voltages below system ground.
Low Current Sensing
The AD8200 can also be used in low current sensing applica-
tions, such as a 4–20 mA current loop shown in Figure 4. In
such applications, the relatively large shunt resistor can degrade
the common-mode rejection. Adding a resistor of equal value in
the low-impedance side of the input corrects for this error.
5V
OUTPUT
10
10
1%
NC = NO CONNECT
1%
–
IN GND A1
A2
+IN
NC +V
S
OUT
AD8200
+
Figure 4. 4–20 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
See Figure 5. Since the preamplifier has an output resistance of
100 k
, an external resistor connected from Pins 3 and 4 to
GND will decrease the gain by a factor R
EXT
/(100 k
+ R
EXT
).
10k
10k
100k
A2
A1
GND
–
IN
OUT
+V
S
NC
+IN
AD8200
OUT
+V
S
R
EXT
V
CM
V
DIFF
GAIN =
20R
EXT
R
EXT
+ 100k
R
EXT
= 100k
GAIN
20
–
GAIN
V
DIFF
2
NC = NO CONNECT
Figure 5. Adjusting for Gains Less than 20
The overall bandwidth is unaffected by changes in gain 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, can be nulled by
inserting a resistor equal to 100 k
minus the parallel sum of
R
EXT
and 100 k
, in series with Pin 4. For example, with R
EXT
= 100 k
(yielding a composite gain of
×
10), the optional offset
nulling resistor is 50 k
(see Figure 11.)
Gains Greater than 20
Connecting a resistor from the output of the buffer amplifier to
its noninverting input, as shown in Figure 6, will increase the
gain. The gain is now multiplied by the factor R
EXT
/(R
EXT
–
100 k
); for example, it is doubled for R
EXT
= 200 k
. Overall
gains as high as 50 are achievable in this way. Note that the
accuracy of the gain becomes critically dependent on resistor
value at high gains. Also, the effective input offset voltage at
Pins 1 and 8 (about six times the actual offset of A1) limits the
part’s use in very high-gain, dc-coupled applications.
10k
10k
100k
A2
A1
–
IN
+V
S
NC
+IN
AD8200
GND
OUT
OUT
+V
S
V
CM
GAIN =
20R
EXT
R
EXT
–
100k
R
EXT
= 100k
GAIN
GAIN
–
20
R
EXT
V
DIFF
V
DIFF
2
NC = NO CONNECT
Figure 6. Adjusting for Gains Greater than 20
GAIN TRIM
Figure 7 shows a method for incremental gain trimming using
a trimpot and external resistor R
EXT
.
The following approximation is useful for small gain ranges:
G
≈
(10 M
÷
R
EXT
) %
Thus, the adjustment range would be
±
2% for R
EXT
= 5 M
;
±
10% for R
EXT
= 1 M
, etc.
–
IN GND A1
A2
+IN
NC +V
S
OUT
AD8200
5V
OUT
R
EXT
GAIN TRIM
20k
MIN
V
CM
V
DIFF
2
V
DIFF
2
NC = NO CONNECT
Figure 7. Incremental Gain Trim
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相關代理商/技術參數(shù) |
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