ADUM3154

3.75 kV, Dedicated Isolators for SPI Interfaces (with Control for up to 4 Slaves)
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Product Details

The ADuM3154 is a 3.75kV rms, 7-Channel, SPIsolator™ digital isolator optimized for a serial peripheral interface (SPI) that includes support for up to four slave devices. (5kV rms model available). Based on the Analog Devices, Inc., iCoupler® chip scale transformer technology, the low propagation delay and jitter in the CLK, MO/SI, MI/SO, and SS channels support SPI clock rates of up to 17 MHz.

The ADuM3154 isolator also provides a slave select multiplexing system that allows up to four slave devices to be serviced from one isolator. The slave select system propagates to the desired output with full propagation speed, allowing tight timing control. The isolated SS multiplexer is addressed through a 250 kbps low speed dual port with 2.5 μs of setup time.

Applications

  • Industrial programmable logic controllers (PLCs)
  • Sensor Isolation

Product Lifecycle

checked Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits

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EVAL-ADUM3154 Circuit Diagram

Product Details

The EVAL-ADuM3154Z supports the ADuM3154ARSZ, ADuM3154BRSZ, ADuM4154ARIZ and ADuM4154BRIZ, which are, 4-channel SPIsolator isolators optimized for use in SPI applications. They include two low speed address pins to rout the slave select to one of four destinations. The evaluation board provides a JEDEC standard 20-lead SSOP pad layout, support for signal distribution, loopback, and loads referenced to VDDx or GNDx, as well as optimal bypass capacitance. Signal sources can be wired onto the board as well as brought onto the board through edge-mounted SMA connectors (sold separately) or terminal blocks for power connections. The board includes 200 mil header positions for compatibility with Tektronix active probes.

The board follows best printed circuit board (PCB) design practices for 4-layer boards, including a full power and ground plane on each side of the isolation barrier. No other EMI or noise mitigation design features are included on this board. In cases of very high speed operation or when ultralow emissions are required, refer to the AN-1109 application note for additional board layout techniques.

Supported SPIsolator Models
  • ADuM3154ARSZ
  • ADuM3154BRSZ
  • ADuM4154ARIZ
  • ADuM4154BRIZ

Reference Materials

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Design Resources

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

ADUM3154 Material Declaration
PCN-PDN Information Quality And Reliability Symbols and Footprints

Discussions

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ADUM3154 Discussions

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Reviews

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Overview

3 Reviews
3 out of 3 (100%) customers recommend this product.
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Most Helpful Review

by Willie
Overall, this product performed exactly as expected & needed for my project. However, I needed to isolate a set of ADC channels and DAC channels from each other, so I used 2 of these SPIsolators, giving me a total of 8 channels (using 2 master slave selects) split onto 2 seperate slave power rails. Individually, these chips work splendidly in giving me 4 channels per SS. However, when I multiplexed the chips on the master end by tying MOSI, MISO and SCLK to a single bus, I came to realize that the MISO line is driven by the chip even when SS is high. This is extremely frustrating since communication returned from one chip (MISO) is always subject to interference from the other chip. Even with the slave MISO lines tied low w/pulldown resistors, the master MISO line is driven and pulled low by the SPIsolator. I managed to get the system up and running with both chips by using resistors to force one chip's MISO to reference the other's as ground, but this is NOT ideal and I am unsure about its long-term viability. This being said, if you need 4 isolated SPI channels, this chip is simply wonderful. Just expect trouble if you intend on multiplexing any further.

Most Recent Review

by Indie Joe
The ADUM3154 insulator IC brings the SPI bus to new territories with ease.

All Reviews

by Indie Joe, 23 Jan 15
ADUM3154
The ADUM3154 insulator IC brings the SPI bus to new territories with ease.
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by Bikeron, 18 Jan 15
MISO Killer
As Willie pointed out in his review the MISO line is driven by the ADuM3154. This is not mentioned in the datasheet. If you miss the comments in the reviews and you are trying to use 2 or more ADuM3154's you will have a hard time! There should be examples of how to get around this in the datasheet.
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by Willie, 7 Oct 14
Excellent product - with one catch.
Overall, this product performed exactly as expected & needed for my project. However, I needed to isolate a set of ADC channels and DAC channels from each other, so I used 2 of these SPIsolators, giving me a total of 8 channels (using 2 master slave selects) split onto 2 seperate slave power rails. Individually, these chips work splendidly in giving me 4 channels per SS. However, when I multiplexed the chips on the master end by tying MOSI, MISO and SCLK to a single bus, I came to realize that the MISO line is driven by the chip even when SS is high. This is extremely frustrating since communication returned from one chip (MISO) is always subject to interference from the other chip. Even with the slave MISO lines tied low w/pulldown resistors, the master MISO line is driven and pulled low by the SPIsolator. I managed to get the system up and running with both chips by using resistors to force one chip's MISO to reference the other's as ground, but this is NOT ideal and I am unsure about its long-term viability. This being said, if you need 4 isolated SPI channels, this chip is simply wonderful. Just expect trouble if you intend on multiplexing any further.
Was this Helpful?Helpful(2)

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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Evaluation Boards Pricing displayed is based on 1-piece.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.