參數(shù)資料
型號(hào)： LTNS
廠商： Linear Technology Corporation
英文描述： 24-Bit No Latency ADC with Differential Input and Reference in MSOP
中文描述： 24位不具有差動(dòng)輸入和ADC的參考延遲，采用MSOP
文件頁數(shù)： 35/40頁
文件大?。?/td> 503K
代理商： LTNS
LTC2411/LTC2411-1
35
Figure 42. Bridge Amplification Using a Single Amplifier
APPLICATIOU
Note that this 4-amplifier topology has advantages over
the typical integrated 3-amplifier instrumentation ampli-
fier in that it does not have the high noise level common in
the output stage that usually dominates when an instru-
mentation amplifier is used at low gain. If this amplifier is
used at a gain of 10, the gain error is only 10ppm and input
referred noise is reduced to 0.15
μ
V
RMS
. The buffer stages
can also be configured to provide gain of up to 50 with high
gain stability and linearity.
Figure 42 shows an example of a single amplifier used to
produce single-ended gain. This topology is best used in
applications where the gain setting resistor can be made
to match the temperature coefficient of the strain gauges.
If the bridge is composed of precision resistors, with only
one or two variable elements, the reference arm of the
bridge can be made to act in conjunction with the feedback
resistor to determine the gain. If the feedback resistor is
incorporated into the design of the load cell, using resis-
tors which match the temperature coefficient of the load-
cell elements, good results can be achieved without the
need for resistors with a high degree of absolute accuracy.
The common mode voltage in this case, is again a function
of the bridge output. Differential gain as used with a 350
bridge is:
R
R
R
1 175
W
U
U
A
V
=
=
+
9 95
.
1
2
Common mode gain is half the differential gain. The
maximum differential signal that can be used is 1/4 V
REF
,
as opposed to 1/2 V
REF
in the 2-amplifier topology above.
Remote Half Bridge Interface
As opposed to full bridge applications, typical half bridge
applications must contend with nonlinearity in the bridge
output, as signal swing is often much greater. Applications
include RTD’s, thermistors and other resistive elements
that undergo significant changes over their span. For
single variable element bridges, the nonlinearity of the half
Figure 43. Remote Half Bridge Interface
0.1
μ
F
5V
REF
+
REF
–
IN
+
IN
–
GND
V
CC
2
3
2
4
6
7
3
350
BRIDGE
4
5
2411 F42
6
1
–
+
LTC1050S8
5V
0.1
μ
V
R2
46.4k
20k
20k
175
1
μ
F
10
μ
F
R1
4.99k
A
V
= 9.95 =
R1 + R2
R1 + 175
+
+
1
μ
F
+
LTC2411/
LTC2411-1
2411 F43
REF
–
IN
+
IN
–
GND
V
CC
V
S
2.7V TO 5.5V
2
3
4
5
PLATINUM
100
RTD
R1
25.5k
0.1%
6
1
4
3
2
1
REF
+
LTC2411/
LTC2411-1
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