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参数资料
| 型号： | DC939A |
| 厂商： | Linear Technology |
| 文件页数： | 32/42页 |
| 文件大小： | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2484 |
| 软件下载： | QuikEval System |
| 设计资源： | DC939A Design File DC939A Schematic |
| 标准包装： | 1 |
| 系列： | Easy Drive™, QuikEval™ |
| ADC 的数量： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 6.8 |
| 数据接口： | MICROWIRE?，串行，SPI? |
| 工作温度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2484 |
| 已供物品： | 板 |
| 相关产品： | LTC2484CDD#TRPBF-ND - IC ADC 24BIT 10-DFN LTC2484IDD#TRPBF-ND - IC ADC 24BIT 10-DFN LTC2484IDD#PBF-ND - IC ADC 24BIT 10-DFN LTC2484CDD#PBF-ND - IC ADC 24BIT 10-DFN |
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LTC2484
38
2484fd
APPLICATIONS INFORMATION
Complete Thermocouple Measurement System with
Cold Junction Compensation
The LTC2484 is ideal for direct digitization of thermocouples
and other low voltage output sensors. The input has a
typical offset error of 500nV (2.5μV max) offset drift of
10nV/°C and a noise level of 600nVRMS.
Figure 44 (last page of this data sheet) is a complete type
K thermocouple meter. The only signal conditioning is a
simple surge protection network. In any thermocouple
meter, the cold junction temperature sensor must be
at the same temperature as the junction between the
thermocouple materials and the copper printed circuit
board traces. The tiny LTC2484 can be tucked neatly
underneath an Omega MPJ-K-F thermocouple socket
ensuring close thermal coupling.
The LTC2484’s 1.4mV/°C PTAT circuit measures the
cold junction temperature. Once the thermocouple volt-
age and cold junction temperature are known, there
are many ways of calculating the thermocouple temp-
erature including a straight-line approximation, lookup
tables or a polynomial curve t. Calibration is per-
formed by applying an accurate 500mV to the ADC input
derived from an LT
1236 reference and measuring the
local temperature with an accurate thermometer as
shown in Figure 43. In calibration mode, the up and
down buttons are used to adjust the local tempera-
ture reading until it matches an accurate thermometer.
Both the voltage and temperature calibration are easily
automated.
The complete microcontroller code for this application is
available on the LTC2484 product Web page at:
http://www.linear.com
It can be used as a template for may different instruments
and it illustrates how to generate calibration coefcients
for the onboard temperature sensor. Extensive comments
detail the operation of the program. The read_LTC2484()
function controls the operation of the LTC2484 and is
listed below for reference.
CS
SCK
SDO
SDI
fO
6
9
7
1
10
VCC
5V
LTC2484
REF
GND
IN–
IN+
3
ISOTHERMAL
2
C7
0.1μF
C8
1μF
4
R2
2k
R7
8k
6
2
5
4
R8
1k
5
2484 F43
26.3C
TYPE K
THERMOCOUPLE
JACK
(OMEGA MPJ-K-F)
11
8
GND
IN OUT
G1
NC1M4V0
TRIM
GND
LT1236
+
Figure 43. Calibration Setup
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| DC940KB-GB | 制造商:DEWALT 功能描述:DRILL 12V |
| DC941A | 功能描述:BOARD DELTA SIGMA ADC LTC2482 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:Easy Drive™, QuikEval™ 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
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| DC945KB-GB | 制造商:DEWALT 功能描述:DRILL 12V |
| DC-9-500-2.1P | 制造商:SR COMPONENTS 功能描述: 制造商:SR Components Inc 功能描述: |
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