參數(shù)資料
型號: LTC2413
廠商: Linear Technology Corporation
元件分類: ADC
英文描述: 2.7V to 5.5V Simultaneous 50Hz/60Hz Rejection Micropower Differential Σ△ Analog to Digital Converter(2.7V ~5.5V,微功耗,24位差分Σ△串行模數(shù)轉換器)
中文描述: 2.7V至5.5V同步50Hz/60Hz抑制微差分Σ△模數(shù)轉換器(2.7?5.5V的,微功耗,24位差分Σ△串行模數(shù)轉換器)
文件頁數(shù): 35/40頁
文件大?。?/td> 373K
代理商: LTC2413
LTC2413
35
APPLICATIU
W
U
U
Figure 44. Bridge Amplification Using a Single Amplifier
0.1
μ
F
5V
REF
+
REF
IN
+
IN
GND
V
CC
3
3
2
4
6
7
4
350
BRIDGE
5
6
2413 F44
1, 7, 8, 9,
10, 15, 16
2
LTC2413
+
LTC1050S8
5V
0.1
μ
V
R2
46.4k
20k
20k
175
1
μ
F
10
μ
F
R1
4.98k
(
)
A
V
= 9.98 1 +
46.4k
4.99k + 175
+
+
1
μ
F
+
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 49 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 LTC2413 of 2.5V, maximizing the AC input range for
applications where induced 60Hz could reach amplitudes
up to 2V
RMS
.
The last two example circuits could be used where mul-
tiple bridge circuits are involved and bridge output can be
multiplexed onto a single LTC2413, via an inexpensive
multiplexer such as the 74HC4052.
Figure 48 shows the use of an LTC2413 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.
相關PDF資料
PDF描述
LTC2414CGN 8-/16-Channel 24-Bit No Latency TM ADCs
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