16-Bit, 8 Channel, Integrated Analog Input module for Programmable Logic Controllers (PLC) TIDA-00164 (OBSOLETE)

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This reference design provides a complete solution for a single supply industrial control Analog Input Module. The reference design is suitable for process control end equipment like Programmable Logic Controllers (PLC), Distributed Control system (DCS), Data Acquisition Systems (DAS) modules that must digitize standard industrial current inputs and bipolar or unipolar input voltage ranges up to ±10V.

In an industrial environment the analog voltage and current ranges typically include ±2.5 V, ±5 V, ±10 V, 0 V to 5 V, 0 V to 10 V, 4 mA to 20 mA, and 0 mA to 20 mA. This reference design can measure all standard industrial voltage and current inputs. Eight channels are provided on the module and each channel can be configured as a current or voltage input with software configuration. The SAR based architecture of ADS8688 leverages better sampling rate. The ADS8688 also includes an on-chip PGA. The on-chip PGAs are used to provide gain and level shift the bipolar signals. The ISO7141 & ISO1541D provides digital signal isolation between host microcontroller and measurement side. The power isolation has been achieved using LM5017 based Flybuck transformer. The module has on-board EEPROM to store calibration data and module configuration data. This reference design also demonstrate the TI products like hot swap & in-rush current limit controller, isolated Flybuck controller, low noise LDO, and I2C to GPIO expander that can be used in the entire PLC signal processing chain. The module has been designed to be pluggable to the IO Controller (TIDA-00123) for quick testing & evaluation. The module reference design also includes external protection circuit and has been tested and verified to be compliant with IEC61000-4 standards – EFT, ESD and Surge requirements with IO Controller platform.

  • 8 channel, 16 bit SAR ADC ADS8688 that supports from 300ksps to 30ksps per channel
  • Programmable channels: Each channel can be configured as current or voltage input with software configuration
  • Programmable Current Range (0-20mA) and Voltage range (+/-10V)
  • Single 24V input power supply operation
  • Designed for IEC-61000 compliance (IEC-61000-4-4: EFT up to ±2KV @ 5KHz on signal ports;  IEC-61000-4-2: ESD up to 4KV contact & 8KV air discharge;  IEC-61000-4-5: Surge up to ±1KV line-earth (CM) on signal ports)

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TI Devices (8)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS8688  16-Bit 500kSPS 8-Channel Single-Supply SAR ADC With Bipolar Input Ranges  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ISO1540  2.5-kVrms isolated bidirectional clock, bidirectional I2C isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
ISO7141CC  4242-VPK Small-Footprint and Low-Power 3/1 Quad Channel Digital Isolator with Noise Filter  Isolation  Sample & Buy View Design Kits & Evaluation Modules
LM5017  7.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules
LM5069  Positive High Voltage Hot Swap / Inrush Current Controller with Power Limiting  Power switches  Sample & Buy View Design Kits & Evaluation Modules
LM94022  ±1.5°C Temperature Sensor with Multiple Gain and Class-AB Analog Output  Temperature sensors  Sample & Buy View Design Kits & Evaluation Modules
TCA6408A  Low-Voltage 8-Bit I2C and SMBus I/O Expander  I2C  Sample & Buy View Design Kits & Evaluation Modules
TPS709  150-mA 30-V ultra-low-Iq wide-input low-dropout (LDO) regulator with reverse current protection  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS8688 Download
ISO1540 Download Download
ISO7141CC Download Download
LM5017 Download Download
Download Download
LM5069 Download Download
LM94022 Download Download
TCA6408A Download Download
Download Download
Download Download
TPS709 Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 7745 17 Sep 2014
Design files (6)
Title Type Size (KB) Date
ZIP 3052 30 Jul 2014
ZIP 4087 30 Jul 2014
PDF 3442 30 Jul 2014
PDF 409 30 Jul 2014
PDF 40 30 Jul 2014
PDF 1082 30 Jul 2014
Related Tools & Software

Reference Designs  ( 2 )

Design Kits & Evaluation Modules  ( 1 )

Name Part Number Tool Type
BeagleBone Black Development Board  BEAGLEBK  Evaluation Modules & Boards 

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