3.75 kV, 7-Channel, SPIsolator

Multiple Slave, Digital Isolator for SPI

Data Sheet

ADuM3154

FEATURES

Supports up to 17 MHz SPI clock speed

4 high speed, low propagation delay, SPI signal isolation

channels

Supports up to 4 slave devices

20-lead SSOP package with 5.1 mm creepage

High temperature operation: 125°C

High common-mode transient immunity: >25 kV/µs

Safety and regulatory approvals

UL recognition per UL 1577

3750 V rms for 1 minute

CSA Component Acceptance Notice 5A

VDE certificate of conformity

DIN V VDE V 0884-10 (VDE V 0884-10):2006-12

APPLICATIONS

Industrial programmable logic controllers (PLCs)

Sensor isolation

FUNCTIONAL BLOCK DIAGRAM

ENCODE

CONTROL

BLOCK

DECODE

DECODE

ENCODE

ENCODE

DECODE

ENCODE

DECODE

MCLK

MO

MI

MSS

SSA0

SSA1

NIC

NIC = NOT INTERNALLY CONNECTED

SCLK

SI

SO

SS0

SS1

SS2

SS3

1

2

3

4

5

6

7

8

20

19

18

17

16

15

14

13

9

10

12

11

ADuM3154

CONTROL

BLOCK

MUX

Figure 1.

GENERAL DESCRIPTION

The ADuM31541 is an SPIsolator™ digital isolator optimized for

a serial peripheral interface (SPI) that includes support for up to

four slave devices. 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 SPI bus signals 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. When a target slave is selected, the slave select

signal propagates to the desired output with low propagation

delay, allowing tight timing control. The isolated SSx is addressed

through a 250 kbps low speed, 2-channel address bus, allowing

the target slave device to be changed in as little as 2.5 µs.

Table 1. Related Products

Product

Description

ADuM3150

3. 75 kV, high speed, clock

delayed SPIsolator

ADuM3151/ADuM3152/

ADuM3153

3.75 kV, multichannel SPIsolator

ADuM4150

5 kV, high speed, clock delayed

SPIsolator

ADuM4151/ADuM4152/

ADuM4153

5 kV, multichannel SPI solator

ADuM4154

5 kV, multiple slave SPIsolator

1

Protected by U.S. Patents 5,952,849; 6,262,600; 6,873,065; and 7075329. Other patents are pending.

Rev. A

Document Feedback

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

©2014–2015 Analog Devices, Inc. All rights reserved.

Technical Support

www.analog.com