Rorebai Sensor Interface Solution

Industrial & IoT Application

Description

Integrated sensor interface solution featuring Rorebai precision op-amps, ADCs, and power management for temperature, pressure, and flow sensor applications.

Core Advantages

Universal sensor compatibility with programmable gain
Microvolt-level offset for small signal sensors
24-bit resolution for precise measurement
Ratiometric measurement eliminates drift
Isolated power options for industrial use

Recommended Bill of Materials (BOM)

Item Part Number Description Quantity Datasheet
1 CBM24AD01 24-bit precision ADC with PGA 1 📄 Download
2 CBMOPA201 Chopper-stabilized precision op-amp 2 📄 Download
3 CBMREF20 Precision voltage reference 1 📄 Download
4 CBMPWR10 Isolated DC-DC converter 1 📄 Download

Applications

Temperature Measurement
Pressure Sensing
Flow Measurement
Industrial Process Control
Building Automation
Environmental Monitoring

Technical Specifications

A D C Resolution
24-bit
A D C Sampling Rate
10 SPS to 1kSPS
Input Range
±10mV to ±10V programmable
Offset Voltage
<1 µV
Gain Error
<0.01%
Isolation
2500Vrms optional
Operating Temperature
-40°C to +85°C

Customer Success Stories

Industrial Automation Company

Industrial | Multi-Channel Temperature Monitor

Challenge

Required accurate temperature measurement for 16-channel industrial process monitor

Solution

Implemented CBM24AD01 with CBMOPA201 for each channel

Results

Smart Agriculture Startup

Agriculture | Soil Monitoring Node

Challenge

Needed low-power, accurate sensor interface for battery-powered wireless nodes

Solution

Used CBM24AD01 with sleep mode and ratiometric measurement

Results

FAE Expert Insights

D

David Liu

Principal FAE - Sensor Systems

14 years in industrial sensor design

Professional Insights

I've designed sensor interfaces for countless industrial applications, and the key is understanding your error budget. The CBM24AD01's 24-bit resolution is meaningless if your front-end adds 100µV of offset. That's why I always recommend chopper-stabilized amplifiers like the CBMOPA201 for sensor applications. For thermocouples, cold junction compensation is critical - use a good local temperature sensor and keep the connection point isothermal. For RTDs, 3-wire or 4-wire configurations eliminate lead resistance errors. Remember that ratiometric measurement eliminates reference drift. With proper design, this solution achieves accuracy that rivals much more expensive dedicated sensor transmitters.

Key Takeaways

  • Use chopper-stabilized amplifiers for low offset
  • Implement proper cold junction compensation
  • Use ratiometric measurement for stability
  • Consider isolation for industrial environments

Decision Framework

Sensor Interface Selection Framework
Steps:
  1. Identify sensor type and output range
  2. Determine required accuracy and resolution
  3. Select appropriate signal conditioning
  4. Consider isolation and environmental requirements
  5. Plan calibration and validation procedure

Ready to Implement This Solution?

Contact our FAE team for design support and quotes

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Frequently Asked Questions

What sensor types are supported by this solution?

The Sensor Interface Solution supports multiple sensor types: (1) Temperature - RTDs (Pt100, Pt1000), thermocouples (J, K, T, E, N, S, R, B types)

(2) Pressure - strain gauge, piezoresistive, capacitive

(3) Flow - differential pressure, turbine, magnetic

(4) Level - capacitive, ultrasonic, radar

(5) General - 4-20mA loops, 0-10V signals, bridge sensors. The programmable gain amplifier accommodates sensor outputs from ±10mV to ±10V. Contact LiTong FAE for specific sensor interface design support.

How do I achieve high accuracy with thermocouples?

Thermocouple accuracy optimization: (1) Cold junction compensation - use accurate temperature sensor at connection point

(2) Reference junction - CBMREF20 provides stable 2.5V reference

(3) Amplifier - CBMOPA201's <1µV offset preserves small TC signals

(4) Filtering - implement 10Hz low-pass for noise reduction

(5) Linearization - use built-in ADC lookup tables or polynomial correction. The solution achieves ±0.5°C accuracy for K-type thermocouples over -200°C to +1372°C range. Contact LiTong FAE for thermocouple design guidance.

What isolation options are available?

Isolation options for the Sensor Interface Solution: (1) Power isolation - CBMPWR10 provides 2500Vrms isolated DC-DC

(2) Signal isolation - external isolation amplifiers available

(3) Digital isolation - isolated SPI interface using digital isolators

(4) Channel-to-channel - individual isolation for multi-channel systems

(5) Protection - isolated designs withstand industrial transients. Isolation is recommended for industrial environments with high EMI or ground potential differences. Contact LiTong FAE for isolated design recommendations.