Channel-to-channel isolated analog input module reference design
TIDA-010048
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Key Document
Description
This reference design is a four channel-to-channel, isolated 4–20 mA, current-loop analog input module. The design includes a short circuit, overcurrent, and overvoltage limit function for condition monitoring sensor and module applications. The major features of this analog input module include channel isolation, a multi-channel analog input module powered up by a single flyback converter using LM5180 device, a power supply to 2-wire transmitter and short-circuit protection circuit. This design can also support a four-channel analog input module.
Features
- 1 to 4 channel-to-channel isolated analog input module
- Supply for field transmitters with output power limitation (short limited to 25mA)
- Transmitter supply: 25 ±1V, IOUT < 25-mA peak
- Input protected against miswiring
- UART interface 24b ΔΣADC to reduce BOM size and cost
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Schematic/Block Diagram
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Design Guide
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TI Devices (8)
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| Sample & Buy |
Design Kits & Evaluation Modules |
| ADS122U04 |
24-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC w/ PGA, VREF, 2x IDACs & UART interface |
Analog-to-digital converters (ADCs) |
Sample & Buy |
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| ISO7721 |
Robust EMC, dual-channel, 1/1, reinforced digital isolator |
Isolation |
Sample & Buy |
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| LM5180 |
65-VIN PSR flyback converter with 100-V, 1.5-A integrated power MOSFET |
Offline & isolated DC/DC controllers & converters |
Sample & Buy |
View Design Kits & Evaluation Modules |
| LM5180-Q1 |
Automotive 65-VIN PSR flyback converter with 100-V, 1.5-A integrated power MOSFET |
Offline & isolated DC/DC controllers & converters |
Sample & Buy |
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| SN74LV4052A |
5-V, 4:1, 2-channel analog multiplexer |
Switches & multiplexers |
Sample & Buy |
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| TPS2662 |
4.5-V-57-V, 478mΩ, 0.025-0.88A eFuse with integrated input and output reverse polarity protection |
Power switches |
Sample & Buy |
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| TPS7A49 |
150-mA, 36-V, low-noise, high-PSRR, adjustable low-dropout voltage regulator with enable |
Power management |
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| TVS3300 |
33-V flat-clamp surge protection device |
Circuit protection ICs |
Sample & Buy |
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CAD/CAE symbols
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Texas Instruments and Accelerated Designs, Inc. have collaborated together to provide TI customers with schematic symbols and PCB layout footprints for TI products.
Step 1: Download and install the free download.
Step 2: Download the Symbol and Footprint from the CAD.bxl file table.
Step 3: Open the .bxl file with the Ultra Librarian software.
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Technical documentation
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User guides (1)
| Title | Type | Size (KB) | Date |
| | PDF | 1054 |
04 Apr 2019
|
Design files (6)
| | ZIP | 1559 |
04 Apr 2019
|
| | ZIP | 3092 |
04 Apr 2019
|
| | PDF | 1366 |
04 Apr 2019
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| | PDF | 1348 |
04 Apr 2019
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| | PDF | 104 |
04 Apr 2019
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| | PDF | 309 |
04 Apr 2019
|
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