 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
ADS112U04IRTET Datasheet(PDF) 51 Page - Texas Instruments |
|
|
||||||||||||||||||||||||||||||
ADS112U04IRTET Datasheet(HTML) 51 Page - Texas Instruments |
|
|
51 / 72 page  3.3 V Thermocouple CDIF CCM1 CCM2 RF2 RF1 RB2 RB1 AIN0 AIN1 AIN2 AINP AINN Low-Drift Oscillator Reference Mux Precision Temperature Sensor RX TX AVDD AVSS GPIO1 GPIO0 TI Device GPIO2/DRDY DGND REFP REFN 2.048-V Reference 10 A to 1.5 mA Mux DVDD PGA 16-Bit û ADC Digital Filter and UART Interface 3.3 V 0.1 PF 3.3 V 0.1 PF Copyright © 2017, Texas Instruments Incorporated RESET AIN3 Isothermal Block GND GS1 GS0 OUT VDD LM94022 3.3 V Cold-Junction Compensation 51 ADS112U04 www.ti.com SBAS838 – JANUARY 2018 Product Folder Links: ADS112U04 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated 9.2 Typical Applications 9.2.1 K-Type Thermocouple Measurement (–200°C to +1250°C) Figure 76 shows the basic connections of a thermocouple measurement system when using an external high- precision temperature sensor for cold-junction compensation. Apart from the thermocouple itself, the only external circuitry required are two biasing resistors, a simple low-pass, antialiasing filter, and the power-supply decoupling capacitors. Figure 76. Thermocouple Measurement 9.2.1.1 Design Requirements (1) Not accounting for error of the thermocouple and cold-junction temperature measurement; offset calibration at T(TC) = T(CJ) = 25°C; no gain calibration. Table 24. Design Requirements DESIGN PARAMETER VALUE Supply voltage 3.3 V Reference voltage Internal 2.048-V reference Update rate ≥10 readings per second Thermocouple type K Temperature measurement range –200°C to +1250°C Measurement accuracy at TA = 25°C (1) 0.5°C 9.2.1.2 Detailed Design Procedure The biasing resistors RB1 and RB2 are used to set the common-mode voltage of the thermocouple such that the input voltages do not exceed the absolute input voltage range of the PGA (in this example, to mid-supply AVDD / 2). If the application requires the thermocouple to be biased to GND, either a bipolar supply (for example, AVDD = 2.5 V and AVSS = –2.5 V) must be used for the device to meet the absolute input voltage requirement of the PGA, or the PGA must be bypassed. When choosing the values of the biasing resistors, care must be taken so that the biasing current does not degrade measurement accuracy. The biasing current flows through the thermocouple and can cause self-heating and additional voltage drops across the thermocouple leads. Typical values for the biasing resistors range from 1 MΩ to 50 MΩ. |
Similar Part No. - ADS112U04IRTET |
|
Similar Description - ADS112U04IRTET |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
