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參數資料
| 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△串行模數轉換器) |
| 中文描述： | 2.7V至5.5V微功耗24位差分Σ△模數轉換器（2.7?5.5V的，微功耗，24位差分Σ△串行模數轉換器） |
| 文件頁數： | 19/24頁 |
| 文件大小： | 268K |
| 代理商： | LTC2411 |
LTC2411
19
APPLICATIU
W
U
U
instrumentation amplifier is not necessary, as the LTC2411
has common mode rejection far beyond that of most
amplifiers. The LTC1051 is a dual autozero amplifier that
can be used to produce a gain of 30 before its input
referred noise dominates the LTC2411 noise. This ex-
ample shows a gain of 34, that is determined by a feedback
network built using a resistor array containing 8 individual
resistors. The resistors are organized to optimize tem-
perature tracking in the presence of thermal gradients. The
second LTC1051 buffers the low noise input stage from
the transient load steps produced during conversion.
The gain stability and accuracy of this approach is very
good, due to a statistical improvement in resistor match-
ing due to individual error contribution being reduced. A
gain of 34 may seem low, when compared to common
practice in earlier generations of load-cell interfaces, how-
ever the accuracy of the LTC2411 changes the rationale.
Achieving high gain accuracy and linearity at higher gains
may prove difficult, while providing little benefit in terms
of noise reduction.
At a gain of 100, the gain error that could result from
typical open-loop gain of 160dB is –1ppm, however,
worst-case is at the minimum gain of 116dB, giving a gain
error of –158ppm. Worst-case gain error at a gain of 34,
is –54ppm. The use of the LTC1051A reduces the worst-
case gain error to –33ppm. The advantage of gain higher
than 34, then becomes dubious, as the input referred
noise sees little improvement
1
and gain accuracy is poten-
tially compromised.
Note that this 4-amplifier topology has advantages over
the typical integrated 3-amplifier instrumentation ampli-
fier in that it does not have the high noise level common in
the output stage that usually dominates when an instru-
mentation amplifier is used at low gain. If this amplifier is
used at a gain of 10, the gain error is only 10ppm and input
referred noise is reduced to 0.15
μ
V
RMS
. The buffer stages
can also be configured to provide gain of up to 50 with high
gain stability and linearity.
Figure 13 shows an example of a single amplifier used to
produce single-ended gain. This topology is best used in
applications where the gain setting resistor can be made
to match the temperature coefficient of the strain gauges.
If the bridge is composed of precision resistors, with only
one or two variable elements, the reference arm of the
1
Input referred noise for A
V
= 34 for approximately 0.05
μ
V
RMS
, whereas at a gain of 50, it would be
0.048
μ
V
RMS
.
Figure 12. Using Autozero Amplifiers to Reduce Input Referred Noise
0.1
μ
F
8
0.1
μ
F
0.1
μ
F
REF
+
REF
–
SDO
SCK
IN
+
IN
–
CS
GND
V
CC
F
O
2
8
5V
REF
3
350
BRIDGE
9
4
5
2411 F12
10
6
1
10
LTC2411
RN1 = 5k
×
8 RESISTOR ARRAY
U1A, U1B, U2A, U2B = 1/2 LTC1051
–
+
3
2
8
4
U1A
4
5V
+
–
6
5
RN1
1
16
15
2
6
11
7
1
14
3
7
10
4
13
8
9
5
12
U1B
–
+
3
2
U2A
5V
1
–
+
6
5
U2B
7
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC2411-1CMS | 功能描述:IC A/DCONV DIFF INPUT&REF 10MSOP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:16 采樣率（每秒）:45k 數據接口:串行 轉換器數目:2 功率耗散（最大）:315mW 電壓電源:模擬和數字 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) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:16 采樣率（每秒）:45k 數據接口:串行 轉換器數目:2 功率耗散（最大）:315mW 電壓電源:模擬和數字 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) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:16 采樣率（每秒）:45k 數據接口:串行 轉換器數目:2 功率耗散（最大）:315mW 電壓電源:模擬和數字 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) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:16 采樣率（每秒）:45k 數據接口:串行 轉換器數目:2 功率耗散（最大）:315mW 電壓電源:模擬和數字 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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