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參數(shù)資料
| 型號： | INA104 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | Very-High Accuracy Instrumentation Amplifier(非常高精度的儀用放大器) |
| 中文描述： | 甚高精度儀表放大器（非常高精度的儀用放大器） |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 132K |
| 代理商： | INA104 |
8
INA104
FIGURE 2. Optional Output Offset Nulling or Offsetting
Using an Amplifier (Low Impedance to Pin 6).
FIGURE 3. Additional Gain From Output Stage.
OPTIONAL OFFSET ADJUSTMENT
PROCEDURE
It is frequently desirable to null the input component of offset
(Figure 1) and occasionally that of the output (Figure 2). The
quality of the potentiometer will affect the results, therefore,
choose one with good temperature and mechanical-resistance
stability. The procedure is as follows:
1. Set E
1
= E
2
= 0V (be sure a good ground return path exists
to the input).
2. Set the gain to the desired value (greater than 1) by
choosing R
G
.
3. Adjust the 100k
potentiometer in Figure 1 until the
output reads 0V
±
1mV or desired setting. Note that the
offset will change when the gain is changed.
4. If the output component of offset is to be removed or if it
is desired to establish an intentional offset, adjust the
100k
potentiometer in Figure 2 until the output reads 0V
±
1mV or desired setting. Note that the offset will not
change with gain, but be sure to use a stable amplifier with
good DC characteristics. The range of adjustment is
±
15mV
as shown. For larger ranges, change the ratio of R
1
to R
2
.
The op amp is used to maintain a low resistance (<0.1
)
from pin 6 to Common to avoid CMR degradation.
BASIC CIRCUIT CONNECTION
The basic circuit connection for the INA104 is shown in Figure
1. The output voltage is a function of the differential input
voltage times the gain. Figure 1 does not include additional
internal op amp A
4
. Power supply bypassing with a 1
μ
F
tantalum capacitor or equivalent is always recommended.
In applications which do not use the fourth internal amplifier
(A
4
—pins 7, 9, 10, 11, and 12), pin 7 should be connected
to Common and pins 10 and 11 should be connected to-
gether. This will prevent the output of A
4
from saturating
(“l(fā)ocking-up”) and affecting the offset of the instrumenta-
tion amplifier, A
1
, A
2
, and A
3
.
TYPICAL APPLICATIONS
Many applications of instrumentation amplifiers involve the
amplification of low-level differential signals from bridges
and transducers such as strain gages, thermocouples, and
RTDs. Some of the important parameters include common-
mode rejection (differential cancellation of common-mode
offset and noise), input impedance, offset voltage and drift,
gain accuracy, linearity, and noise. The INA104 accom-
plishes all of these with high precision.
Figure 3 shows how the output stage may be used to provide
additional gain. If gains greater than 1000V/V (10,000 up to
100,000 and greater) are desired, it is better to place some
gain in the output amplifier rather than the input stage due
FIGURE 4. Output Offsetting.
3
7
8
9
6
10
13
12
17
18
14
5
1
2
INA104
R
G
R
F
E
OUT
E
1
E
2
+V
CC
–V
CC
A3
Output
(1)
NOTE: (1) A
inverts the output of the Instrumentation Amplifier,
pin 8 to pin 10. Therefore, the equation for E
OUT
shows E
1
– E
2
instead
of E
2
– E
1
.
E
OUT
= (E
1
– E
2
)[(1 + (40k/R
G
)](R
F
/10k)
3
12
10
6
7
8
13
17
18
14
5
1
2
INA104
5k
R
2
1k
R
3
100k
R
1
1M
R
G
+15V
–15V
E
OUT
E
1
E
2
+V
CC
–V
CC
E
8
= E
6
E
OUT
= (E
2
– E
1
)(1+ 40k/R
G
) + V
OFFSET
(1)
NOTE: (1) A
4
, internal to the INA104. External
amp (OPA27 or equivalent) may also be used.
–In
+In
Reference
3
7
8
9
6
10
13
11
17
18
14
5
1
2
INA104
R
G
E
OUT
V
REF
E
1
E
2
+V
CC
–V
CC
–V
CC
+V
CC
(1)
NOTE: (1) A
4
inverts, see Figure 3.
E
OUT
= (E
1
– E
2
)[1 + (40k/R
G
)] + 2V
REF
R
R = a convenient value
(<100k
typically)
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