Datasheet LTM2885 (Analog Devices)

LTM2885 6500VRMS Isolated RS485/RS422 µModule Transceiver + Power
FEATURES DESCRIPTION
n
RS485/RS422 Transceiver: 6500VRMS for 1 Minute
The LTM®2885 is a complete galvanically isolated n
Reinforced Insulation
full-duplex RS485/RS422 µModule® (micromodule) n
Isolated DC Power: 5V at 200mA
transceiver. No external components are required. A n
No External Components Required
single supply powers both sides of the interface through n
20Mbps or Low EMI 250kbps Data Rate
an integrated, isolated, low noise, efficient 5V output n
High ESD: ±15kV HBM on Transceiver Interface
DC/DC converter. n
High Common Mode Transient Immunity: 50kV/μs
Coupled inductors and an isolation power transformer n
Integrated Selectable 120Ω Termination
provide 6500VRMS of isolation between the line transceiver n Extended Creepage and Clearance ~14.6mm and the logic interface. This device is ideal for systems n 1.62V to 5.5V Logic Supply Pin for Flexible where the ground loop is broken allowing for large common Digital Interface mode voltage variation. Uninterrupted communication is n Maximum Continuous Working Voltage: 690VRMS guaranteed for common mode transients up to 50kV/μs. n High Input Impedance Failsafe RS485 Receiver Maximum data rates are 20Mbps or 250kbps in slew n Current Limited Drivers and Thermal Shutdown limited mode. Transmit data, DI, and receive data, RO, are n Compatible with TIA/EIA-485-A and PROFIBUS implemented with event driven low jitter processing. The n High Impedance Output During Internal Fault Condition receiver has a one-eighth unit load supporting up to 256 n Low Current Shutdown Mode (< 10µA) nodes per bus. A logic supply pin allows easy interfacing n General Purpose CMOS Isolated Channel with different logic levels from 1.62V to 5.5V, independent n 22mm × 9mm × 5.16mm Surface Mount BGA Package of the main supply. Enhanced ESD protection allows this part to withstand up
APPLICATIONS
to ±15kV (human body model) on the transceiver interface n Isolated RS485/RS422 Interface pins to isolated supplies and ±25kV through the isolation n Industrial Networks barrier to logic supplies without latch-up or damage. n Breaking RS485 Ground Loops L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks of n Isolated PROFIBUS-DP Networks Analog Devices, Inc. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION Isolated Half-Duplex RS485 μModule Transceiver LTM2885 Operating Through 100kV/μs CM Transients
5V VCC LTM2885 VCC2 5V DI PWR 5V/DIV OUT VL A RO RO 5V/DIV B RE TWISTED-PAIR MULTIPLE SWEEPS TE CABLE OF COMMON MODE DE TION BARRIER TRANSIENTS Y DI ISOLA 300V/DIV Z 2885 TA01b GND GND2 20ns/DIV 2885 TA01a 2885fa For more information www.linear.com/LTM2885 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Switching Characteristics Isolation Characteristics Typical Performance Characteristics Pin Functions Block Diagram Test Circuits Functional Table Applications Information Typical Application Related Parts