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reference designMAX14857

Analog Devices MAX14857

5kVRMS Isolated 500kbps Full-Duplex RS-485/RS-422 Transceivers with ±35kV ESD Protection and Integrated Transformer Driver

Overview

TopologyPush-Pull Converter symmetrical isolated
Input voltage3.3-5 V
Switching frequency350-550 kHz
Output 13 V
IC revision3

Description

The MAX14857/MAX14859 isolated RS-485/RS-422 transceivers provide 5000VRMS (60s) of galvanic isolation between the cable-side (RS-485/RS-422 driver/receiver-side) and the UART-side of the device. Isolation improves communication by breaking ground loops and reduces noise when there are large differences in ground potential between ports. These devices allow for robust communication up to 500kbps (MAX14857) or 25Mbps (MAX14859).

Features

  • High Integration Simplifies Designs
  • Integrated LDO for Cable-Side Power
  • Integrated Transformer Driver for Power Transfer to Cable Side Has Up to 80% Efficiency at 150mA Load
  • High-Performance Transceiver Enables Flexible Designs
  • Compliant with RS-485 EIA/TIA-485 Standard
  • 500kbps (MAX14857)/25Mbps (MAX14859) Maximum Data Rate
  • Up to 128 Devices on the Bus
  • Integrated Protection for Robust Communication
  • ±35kV ESD (HBM) on Driver Outputs/Receiver Inputs
  • 5kVRMS Withstand Isolation Voltage for 60 Seconds (VISO)
  • 1200VPEAK Maximum Repetitive Peak Isolation Voltage (VIORM)
  • 848VRMS Maximum Working Isolation Voltage (VIOWM)

  • 30 Years Lifetime at Rated Working Voltage

  • Withstands ±10kV Surge per IEC 61000-4-5
  • Thermal Shutdown

Typical applications

  • Industrial Automation Equipment, Programmable Logic Controllers
  • HVAC

More information

Products

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Order Code
Data­sheet
Downloads
Status
Product series
VIN
VOut1(V)
IOut1(A)
Type of Insulation
fswitch(kHz)
∫Udt(Vµs)
NPRI : NSEC
L(µH)
VT(V (RMS))
L(mm)
W(mm)
H(mm)
Mount
SamplesAvailability & Sample
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750315231
SPECWE-PPTI Push-Pull Transformers, 3.3 V (DC), 5.4 V
Availability
–
Downloads8 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-PPTI Push-Pull Transformers
Input Voltage 3.3 V (DC)
Output Voltage 15.4 V
Output Current 10.55 A
Type of InsulationReinforced 
Switching Frequency 350 - 550
Voltage-µSecond8.8 Vµs
Turns Ratio1:1.6 
Inductance384 µH
Insulation Test Voltage5000 V (RMS)
Length9.14 mm
Width12.7 mm
Height7.62 mm
MountSMT 
–Check availability
750315229
SPECWE-PPTI Push-Pull Transformers, 5 V (DC), 5.8 V
Availability
–
Downloads8 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-PPTI Push-Pull Transformers
Input Voltage 5 V (DC)
Output Voltage 15.8 V
Output Current 10.9 A
Type of InsulationReinforced 
Switching Frequency 350 - 550
Voltage-µSecond8.8 Vµs
Turns Ratio1:1.1 
Inductance384 µH
Insulation Test Voltage5000 V (RMS)
Length9.14 mm
Width12.7 mm
Height7.62 mm
MountSMT 
–Check availability
750315230
SPECWE-PPTI Push-Pull Transformers, 5 V (DC), 6.9 V
Availability
–
Downloads8 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-PPTI Push-Pull Transformers
Input Voltage 5 V (DC)
Output Voltage 16.9 V
Output Current 10.75 A
Type of InsulationReinforced 
Switching Frequency 350 - 550
Voltage-µSecond8.8 Vµs
Turns Ratio1:1.4 
Inductance384 µH
Insulation Test Voltage5000 V (RMS)
Length9.14 mm
Width12.7 mm
Height7.62 mm
MountSMT 
–Check availability