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Analog Devices MAX14857
5kVRMS Isolated 500kbps Full-Duplex RS-485/RS-422 Transceivers with ±35kV ESD Protection and Integrated Transformer Driver
Overview
| Topology | Push-Pull Converter symmetrical isolated |
| Input voltage | 3.3-5 V |
| Switching frequency | 350-550 kHz |
| Output 1 | 3 V |
| IC revision | 3 |
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
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 | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-PPTI Push-Pull Transformers, 3.3 V (DC), 5.4 V | 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 | |||
| WE-PPTI Push-Pull Transformers, 5 V (DC), 5.8 V | 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 | |||
| WE-PPTI Push-Pull Transformers, 5 V (DC), 6.9 V | 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 |