The circuit on EVAL-CN0337-PMDZ is a completely isolated 12-bit, 300 kSPS RTD temperature measuring system that uses only three active devices. The system processes the output of a Pt100 RTD and includes a circuit for lead-wire compensation using a standard 3-wire connection. The circuit operates on a single 3.3 V supply. The total error after room temperature calibration is less than ±0.24% FSR for a ±10°C change in temperature, making it ideal for a wide variety of industrial temperature measurements.
Both data and power are isolated, thereby making the circuit robust to high voltages and also ground-loop interference often encountered in harsh industrial environments.
The input stage of the circuit is an RTD signal conditioning circuit using a compensated 3-wire connection to the RTD. The circuit translates the RTD input resistance range (100 Ω to 212.05 Ω for a 0°C to 300°C temperature range) into voltage levels compatible with the input range of the ADC (0 V to 2.5 V).
Manufacturer | Analog Devices Inc. |
---|---|
Category | Sensor Solutions |
Sub-Category | Temperature Sensing |
Eval Board Part Number | EVAL-CN0337-PMDZ-ND |
Eval Board Supplier | Analog Devices Inc. |
Eval Board |
Normally In Stock
|
Purpose |
Signal Conditioning
Temp Sensor Interface |
Sensing Method |
RTD, External
|
Accuracy |
±0.24%
|
Sensing Range |
0 ~ 300°C
|
Features |
Local Temp Sensor
SPI Interface |
Design Author |
Analog Devices
|
Main I.C. Base Part |
AD7091R
AD8608 ADuM5401 |
Component Count + Extras |
27 + 2
|
Date Created By Author | 2014-03 |
Date Added To Library | 2018-03 |