参数资料
型号: LTC2411CMS
英文描述: Analog-to-Digital Converter, 24-Bit
中文描述: 模拟到数字转换器,24比特
文件页数: 32/40页
文件大小: 450K
代理商: LTC2411CMS
LTC2411
38
arrays for feedback, can produce results that are similar to
bridge sensing schemes via attenuators. Note that the
amplifiers must have high open-loop gain or gain error will
be a source of error. The fact that input offset voltage has
relatively little effect on overall error may lead one to use
low performance amplifiers for this application. Note that
the gain of a device such as an LF156, (25V/mV over
temperature) will produce a worst-case error of –180ppm
at a noise gain of 3, such as would be encountered in an
inverting gain of 2, to produce –10V from a 5V reference.
The error associated with the 10V excitation would be
–80ppm. Hence, overall reference error could be as high
as 130ppm, the average of the two.
Figure 45 shows a similar scheme to provide excitation
using resistor arrays to produce precise gain. The circuit
is configured to provide 10V and –5V excitation to the
bridge, producing a common mode voltage at the input to
the LTC2411 of 2.5V, maximizing the AC input range for
APPLICATIO S I FOR ATIO
WU
UU
applications where induced 60Hz could reach amplitudes
up to 2VRMS.
The last two example circuits could be used where mul-
tiple bridge circuits are involved and bridge output can be
multiplexed onto a single LTC2411, via an inexpensive
multiplexer such as the 74HC4052.
Figure 44 shows the use of an LTC2411 with a differential
multiplexer. This is an inexpensive multiplexer that will
contribute some error due to leakage if used directly with
the output from the bridge, or if resistors are inserted as
a protection mechanism from overvoltage. Although the
bridge output may be within the input range of the A/D and
multiplexer in normal operation, some thought should be
given to fault conditions that could result in full excitation
voltage at the inputs to the multiplexer or ADC. The use of
amplification prior to the multiplexer will largely eliminate
errors associated with channel leakage developing error
voltages in the source impedance.
2411 F44
REF+
REF
IN+
IN
6
A0
A1
LTC2411
VCC
GND
13
3
6
12
47
F
14
1
5
10
16
5V
15
11
2
TO OTHER
DEVICES
4
9
8
5V
+
74HC4052
2
3
4
5
1
Figure 44. Use a Differential Multiplexer to Expand Channel Capability
相关PDF资料
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