参数资料
型号: LTC2413IGN#PBF
厂商: Linear Technology
文件页数: 33/44页
文件大小: 0K
描述: IC A/D CONV 24BIT MICRPWR 16SSOP
标准包装: 100
位数: 24
采样率(每秒): 6.8
数据接口: MICROWIRE?,串行,SPI?
转换器数目: 2
功率耗散(最大): 1mW
电压电源: 单电源
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-SSOP(0.154",3.90mm 宽)
供应商设备封装: 16-SSOP
包装: 管件
输入数目和类型: 1 个差分,双极
产品目录页面: 1347 (CN2011-ZH PDF)
LTC2413
39
sn2413 2413fs
APPLICATIO S I FOR ATIO
WU
U
Figure 45. Bridge Amplification Using a Single Amplifier
0.1
F
5V
REF+
REF
IN+
IN
GND
VCC
3
2
4
6
7
4
350
BRIDGE
5
6
2413 F45
1, 7, 8, 9,
10, 15, 16
2
LTC2413
+
LTC1050S8
5V
0.1
V
R2
46.4k
20k
175
1
F
10
F
R1
4.99k
()
AV = 9.95 =
R1 + R2
R1 + 175
+
1
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 50 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 2VRMS.
The circuits in Figures 48 and 50 could be used where
multiple bridge circuits are involved and bridge output can
be multiplexed onto a single LTC2413, via an inexpensive
multiplexer such as the 74HC4052.
Figure 49 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.
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