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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： | 30/40页 |
| 文件大小： | 450K |
| 代理商： | LTC2411CMS |
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LTC2411
36
to 1/2 VREF. Hence, the reference resistor R1 must be at
least 2
× the highest value of the variable resistor.
In the case of 100
platinum RTD’s, this would suggest a
value of 800
for R1. Such a low value for R1 is not
advisable due to self-heating effects. A value of 25.5k is
shown for R1, reducing self-heating effects to acceptable
levels for most sensors.
The basic circuit shown in Figure 41 shows connections
for a full 4-wire connection to the sensor, which may be
located remotely. The differential input connections will
reject induced or coupled 60Hz interference, however, the
reference inputs do not have the same rejection. If 60Hz or
other noise is present on the RTD, a low pass filter is
recommended as shown in Figure 42. Note that you
cannot place a large capacitor directly at the junction of R1
and R2, as it will store charge from the sampling process.
A better approach is to produce a low pass filter decoupled
from the input lines with a high value resistor (R3).
The use of a third resistor in the half bridge, between the
variable and fixed elements gives essentially the same
result as the two resistor version, but has a few benefits.
If, for example, a 25k reference resistor is used to set the
excitation current with a 100
RTD, the negative
reference input is sampling the same external node as the
positive input, but may result in errors if used with a long
cable. For short cable applications, the errors may be
acceptably low. If instead the single 25k resistor is
replaced with a 10k 5% and a 10k 0.1% reference
resistor, the noise level introduced at the reference, at
least at higher frequencies, will be reduced. A filter can be
introduced into the network, in the form of one or more
capacitors, or ferrite beads, as long as the sampling
pulses are not translated into an error. The reference
voltage is also reduced, but this is not undesirable, as it
will decrease the value of the LSB, although, not the input
referred noise level.
The circuit shown in Figure 42 shows a more rigorous
example of Figure 41, with increased noise suppression
and more protection for remote applications.
Figure 43 shows an example of gain in the excitation circuit
and remote feedback from the bridge. The LTC1043s
provide voltage multiplication, providing
±10V from a 5V
reference with only 1ppm error. The amplifiers are used at
unity-gain and, hence, introduce a very little error due to
gain error or due to offset voltages. A 1
V/°Coffsetvoltage
drift translates into 0.05ppm/
°C gain error. Simpler alter-
natives, with the amplifiers providing gain using resistor
APPLICATIO S I FOR ATIO
WU
UU
Figure 42. Remote Half Bridge Sensing with Noise Suppression on Reference
REF+
REF–
IN–
GND
VCC
5V
2
3
5
2411 F42
6
1
LTC2411
–
+
LTC1050
5V
PLATINUM
100
RTD
560
R3
10k
5%
R1
10k, 5%
R2
10k
0.1%
1
F
IN+
4
10k
4
3
2
1
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相关代理商/技术参数 |
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| LTC2411CMS#PBF | 功能描述:IC A/D CONV 24BIT MICRPWR 10MSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:microPOWER™ 位数:8 采样率（每秒）:1M 数据接口:串行，SPI? 转换器数目:1 功率耗散（最大）:- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘（4x4） 包装:Digi-Reel® 输入数目和类型:8 个单端，单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6 |
| LTC2411CMS#TR | 功能描述:IC A/D CONV 24BIT MICRPWR 10MSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| LTC2411CMS#TRPBF | 功能描述:IC A/D CONV 24BIT MICRPWR 10MSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| LTC2411IMS | 功能描述:IC A/D CONV 24BIT MICRPWR 10MSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| LTC2411IMS#PBF | 功能描述:IC A/D CONV 24BIT MICRPWR 10MSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:microPOWER™ 位数:8 采样率（每秒）:1M 数据接口:串行，SPI? 转换器数目:1 功率耗散（最大）:- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘（4x4） 包装:Digi-Reel® 输入数目和类型:8 个单端，单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6 |
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