Isolated RS232 + 1W Power 3.3V or 5V Isolated Power REG 5V T1IN T1OUT R1OUT R1IN T2IN T2OUT R2OUT R2IN RS232 BUS LTM2882 Galvanic Isolation Complete 1Mbps µModule® Transceiver Includes 2500VRMS Isolated Power— No External Components Required The LTM®2882 is an isolated RS232 transceiver that guards against large ground-to-ground differentials. The LTM2882’s internal inductive isolation barrier breaks ground loops by isolating the logic level interface and line transceiver. An onboard DC/DC converter provides power to the transceiver, with an isolated 5V supply output for powering additional system circuitry. With 2500VRMS galvanic isolation, onboard secondary power and two RS232 drivers and receivers, the LTM2882 requires no external components and provides a small, complete µModule solution for isolated serial data communications. Features Isolator µModule Technology Isolated RS232 Transceiver: 2500VRMS File #E151738 UL Recognized Integrated Isolated, 1W DC/DC Converter Good Efficiency (Up to 65%) Low EMI 1.62V to 5.5V Logic Supply High Speed Operation 1Mbps for 250pF/3kΩ Load 250kbps for 1nF/3kΩ Load 100kbps for 2.5nF/3kΩ TIA/EIA-232-F Load 3.3V (LTM2882-3) or 5V (LTM2882-5) Operation No Damage or Latchup to ±10kV ESD HBM on Isolated RS232 Interface and Across Isolation Barrier High Common Mode Transient Immunity: >30kV/µs Low Profile Surface Mount (15mm × 11.25mm × 2.8mm) LGA and (15mm × 11.25mm × 3.7mm) BGA Packages LTM2882 Demo Board n n n ® n n n n n n n n n n n n L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks and Isolator logo is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Isolator µModule Technology EW 5 6 7 8 RE RO VL ON VCC ND2 B A VCC2 TOP VIEW 1 To achieve greater than 2500VRMS isolation, the LTM2882 utilizes Isolator µModule Technology, which uses coupled signal inductors embedded in the µModule substrate. This technique ensures consistent ruggedness and reliability, and will be certified by UL, CSA and IEC to guarantee the isolation barrier’s effectiveness. The μModule package integrates several technologies to deliver a cost-effective, advanced solution that minimizes board space and improves electrical and thermal performance. 2 3 4 R2OUT T2IN R1OUT T1IN 5 6 DIN ON 7 8 VL VCC A B C GND D E F G H J K GND2 L R2IN T2OUT R1IN T1OUT DOUT DE KAGE 25mm × 2.8mm) VCC2 LGA PACKAGE 32-PIN (15mm × 11.25mm × 2.8mm) T1IN T1OUT = R1IN 2V/DIV R1OUT DI 2V/DIV Common Mode Transient Immunity Unlike other isolated solutions, the LTM2882 allows communication through common mode transient events greater than 30kV/µs, unaffected by the transient and without introducing any priority data jitter or data corruption. RO MULTIPLE SWEEPS OF COMMON MODE TRANSIENTS 500V/DIV 50ns/DIV Isolated Supply Voltage Output 300 250 VCC2 CURRENT (mA) The LTM2882 is self-powered and provides a well regulated 5V, up to 1W, isolated supply for powering any supporting components on the isolated bus side. This regulated power is continuously available over the operating temperature range, even while driving RS232 compliant signal levels. 200 150 VCC = 5.0V LTM2882-5 VCC = 3.3V LTM2882-3 100 T1OUT AND T2OUT 50 BAUD = 100kbps RL = 3k, CL = 2.5nF VCC2 = 4.8V 0 –50 –25 25 75 0 50 TEMPERATURE (°C) TEST FREQUENCY EN 61000–4–3 80MHz to 1GHz Annex D 1.4MHz to 2GHz 2MHz to 2.7GHz EN 61000–4–8 50Hz to 60Hz Level 4 EN 61000–4–8 60Hz Level 5 EN 61000–4–9 Pulse Level 5 FIELD STRENGTH 10V/m 3V/m 1V/m 30A/m 100 125 RF & Magnetic Field Immunity The LTM2882 passes independent RF and magnetic field immunity test requirements per European Standard EN55024, in accordance with the following test standards: EN 61000-4-3 for radiated, radio frequency, electromagnetic field immunity; EN 61000-4-8 for power frequency magnetic field immunity; EN 61000-4-9 for pulsed magnetic field immunity. 100A/m* 1000A/m *non-IEC method www.linear.com/2882 n 1-800-4-LINEAR 0412E