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參數(shù)資料
| 型號： | LTC2411 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | ADC |
| 英文描述： | 2.7V to 5.5V Micropower 24-Bit 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微功耗24位差分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)： | 20/24頁 |
| 文件大?。?/td> | 268K |
| 代理商： | LTC2411 |
LTC2411
20
APPLICATIU
W
U
U
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 A
V
= 1+ R2/(R1+175
). 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
bridge output can be eliminated completely; if the refer-
ence arm of the bridge is used as the reference to the ADC,
as shown in Figure 14. The LTC2411 can accept inputs up
to 1/2 V
REF
. Hence, the reference resistor R1 must be at
least 2x 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 14 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 reference input, a low pass
filter is recommended as shown in Figure 15. 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 refer-
ence 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 re-
Figure 13. Bridge Amplification Using a Single Amplifier
0.1
μ
F
5V
REF
+
REF
–
IN
+
IN
–
GND
V
CC
2
3
2
4
6
7
3
350
BRIDGE
4
5
2411 F13
6
1
LTC2411
–
+
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
+
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|---|---|
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| LTC2413IGN | 24-Bit No Latency ADC, with Simultaneous 50Hz/60Hz Rejection |
| LTC2413 | 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) |
| LTC2414CGN | 8-/16-Channel 24-Bit No Latency TM ADCs |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC2411-1CMS | 功能描述:IC A/DCONV DIFF INPUT&REF 10MSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 標準包裝:1,000 系列:- 位數(shù):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個單端，單極 |
| LTC2411-1CMS#PBF | 功能描述:IC A/DCONV DIFF INPUT&REF 10MSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 標準包裝:1,000 系列:- 位數(shù):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個單端，單極 |
| LTC2411-1CMS#TR | 功能描述:IC A/DCONV DIFF INPUT&REF 10MSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 標準包裝:1,000 系列:- 位數(shù):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個單端，單極 |
| LTC2411-1CMS#TRPBF | 功能描述:IC A/DCONV DIFF INPUT&REF 10MSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 標準包裝:1,000 系列:- 位數(shù):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個單端，單極 |
| LTC2411-1CMSPBF | 制造商:Linear Technology 功能描述:ADC 24-Bit Differential and Ref. MSOP10 |
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