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參數(shù)資料
| 型號(hào)： | MM1089 |
| 廠(chǎng)商： | MITSUMI ELECTRIC |
| 英文描述： | Sensor Amplifier |
| 中文描述： | 傳感器放大器 |
| 文件頁(yè)數(shù)： | 9/9頁(yè) |
| 文件大小： | 159K |
| 代理商： | MM1089 |
MITSUMI
Sensor Amplifier MM1089
2. Input voltage range vs gain
Shown in Fig. 5. By switching the range using
the input range switching pin, input from GND
level to V
CC
level is provided.
3. Voltage gain coefficient K vs Rg
Rs/Rg nearly coincides with the voltage gain,
with a slight difference. This difference is
represented by K, but as Rg changes K also
changes. This relationship is indicated in Fig. 6.
The output from the MM1089 may be passed
through an A/D converter and input to a
microcomputer for offset correction; an example
appears in Fig.7. Here the inputs IN A and IN B are
signal sources with input voltage ranges extending
to GND level, while IN C and IN D are inputs which
extend to V
CC
level.
1. An analog switch is used to input IN A to both
input pins, the other switches are turned off. A
control output is used to apply the "L" level to
the input range switching pin. Here the output
is V
COM
+V
OFA
, and this is read by the
microcomputer and stored as V
A
.
2. Next, an analog switch is used to input INC to
both input pins; other switches are turned off.
Here the input range switching pin is set to "H"
by the control output. The output at this time is
V
COM
+V
OFB
, and this is read by the
microcomputer and stored as V
B
. The above
are preparatory measurements.
3. Analog switches are set so that IN A is at one
input, and IN B at the other; the other switches
are turned off. The control output sets the input
range switching pin to "L" level. Here the
measured value V
X1
is the output voltage V
O1
less the previously determined V
A
.
V
X1
=V
O1
-V
A
=(IN A-IN B) G
V
4. Analog switches are set to input IN C to one
input pin and IN D to the other; the other
switches are turned off. The input range
switching pin is set "H" by the control output.
The measured value V
X2
is the output voltage
V
O2
less the previous V
B
.
V
X2
=V
O2
-V
B
=(IN C-IN D) G
V
7. Summary
As explained above, an amplifier which is simple
yet has a high CMR can be configured using the
MM1089.
The MM1089 used together with a CPU equipped
with an internal D/A converter should find a broad
range of applications.
Fig.4. CMR vs differential gain
Fig.5. Common mode input voltage range
Fig.6. Voltage gain coefficient K vs Rg
Fig.7. Application example
10
0
10
1
10
2
10
3
[k
]
Rg
0.86
0.88
0.90
0.92
0.94
0.96
0.98
1.00
G
V
=K Rs/Rg
V
c
24
28
32
36
40
44
50
60
70
80
90
100
110
120
130
[dB]
[dB]
Differential gain
CMR
MM1089
0.1%
1.0%
Rs, Rg error
Instrumentation amp final stage
-
2 0
2
4
6
8
10 12 14 16 18 [V]
10
20
30
40
50
L
H
L
H
[dB]
V
DC input voltage V
ICM
L : Input range switching pin low
H : Input range switching pin high
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