Maxim公司的MAX14483是六路3.75kVRMS數字電隔離器，采用公司的專有工藝技術，最佳用于SPI接口，在SDI，SDO和SCLK通路有非常低的傳輸時延，典型時延10ns，時鐘高達100MHz，數據速率高達200Mbps，脈寬失真小于2ns，典型抖動250ps， 主要用在可編邏輯控制器（PLC），工業自動化，過程自動化，建筑物自動化，機器人和通用SPI總線隔離。本文介紹了MAX14483優勢和特性，功能框圖，多種應用電路，以及評估板MAX14483 EVK主要特性，電路圖，材料清單和PCB設計圖。

The MAX14483 is a 6-channel， 3.75kVRMS digital galvanic isolator using Maxim’s proprietary process technology. The six signal channels are individually optimized for SPI applications and include very low propagation delay on the SDI， SDO， and SCLK channels. The SDO channel’s tri-state control is enabled by the CS input as well as a second enable control input pin （SDOEN）， allowing a single MAX14483 to isolate multiple SPI devices. To simplify system design， an open-drain FAULT output can be wire ORed with error outputs from other devices. In addition， an auxiliary channel （AUX） is available for passing timing or control signals from the master side to the slave side and power monitors （SAA， SBA） are provided for both power domains to signal if the opposite side of the isolator is ready for operation. Independent 1.71V to 5.5V supplies on each side of the isolator also make the device suitable for use as a level translator.

The MAX14483 has an isolation rating of 3.75kVRMS for 60 seconds and is available in a 20-pin SSOP package with 5.5mm of creepage and clearance. The package material has a minimum comparative tracking index （CTI） of 400V， which gives it a group 2 rating in creepage tables.The MAX14483 is rated for operation at ambient temperatures of -40℃ to +125℃。

MAX14483優勢和特性：

Saves Space and Components6 Isolated Channels in a 20-SSOP Package

Low Propagation Delay on SCLK， SDI， and SDOUp to 100MHz Clock， 200Mbps Data Rate

10ns Typical Propagation Delay

2ns Maximum Pulse Width Distortion

250ps Typical Peak Jitter

Robust Galvanic Isolation of Digital SignalsWithstands 3.75kVRMS for 60s （VISO）

Continuously Withstands 450VRMS （VIOWM）

Withstands ±10kV Surge between GNDA and GNDB with 1.2/50μs Waveform

High CMTI （50kV/μs， Typical）

Flexible System DesignWide 1.71V to 5.5V Voltage Range on Each Side

SDOEN Control Pin for Sharing Isolators

Open-Drain FAULT Channel for Shared Interrupt on Master Side

Auxiliary Channel for Timing or Control

Low Power Consumption1.53mW per Channel at SCLK = 10MHz withVDD = 3.3V

0.77mW per Channel at SCLK = 10MHz withVDD = 1.8V

MAX14483應用：

Programmable Logic Controllers

Industrial Automation

Process Automation

Building Automation

Robotics

General SPI-bus Isolation

圖1.MAX14483功能框圖

圖2.MAX14483電流計算案例應用電路圖

圖3.MAX14483隔離的SPI接口電路

圖4.MAX14483隔離的SPI菊花鏈,16個數字輸出

圖5.MAX14483隔離的單獨從SPI總線,16個數字輸出

評估板MAX14483 EVK

The MAX14483 evaluation kit （EV kit） provides a proven design to evaluate the MAX14483， 6-channel， 3.75kVRMS， SPI digital isolator. The EV kit allows easy access to all six channels through either SMA connectors or test points. On-board LEDs on the ready signals （SAA and SBA） and FAULT output directly indicate the signals’status.

The EV kit should be powered from two independent isolated power supplies with nominal output voltage in range from 1.71V to 5.5V. For evaluating the electrical parameters of the device without any isolation between the two sides， a single power supply can also be used.

The MAX14483EVKIT# comes populated with the MAX14483AAP+ installed in a 20-pin SSOP package with 5.5mm of creepage and clearance.

評估板MAX14483 EVK主要特性：

Six Unidirectional Channels with Different Channel Direction Configuration and Data Speed （Up to 200Mbps）

On-Board LEDs Indication of Device Ready for Communication

SMA Connectors for Easy Connection to External Equipment

Wide Power Supply Voltage Range from 1.71V to 5.5V

Guaranteed Up to 3.75kVRMS Isolation for the 20-pin SSOP Package for 60s

-40℃ to +125℃ Temperature Range

Proven PCB Layout

Fully Assembled and Tested

圖6.評估板MAX14483 EVK外形圖

圖7.評估板MAX14483 EVK電路圖

評估板MAX14483 EVK材料清單:

圖8.評估板MAX14483 EVK PCB設計圖:左:頂層絲印;右:頂層

圖9.評估板MAX14483 EVK PCB設計圖:左:層2 GND;右:層3 PWR

圖10.評估板MAX14483 EVK PCB設計圖:左:底層;右:底層絲印