Dual-Channel Transceiver integrates isolated power.
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Press Release Summary:
With 2,500 Vrms of galvanic isolation, 2-channel µModule® LTM2882 guards against ground-to-ground differentials and common mode transients. Unit breaks ground loops by isolating logic level interface and line transceiver using internal inductive signal isolation. DC-DC converter generates power supplies for driving RS232 levels and provides additional isolated 5 V supply output. Operating up to 1 Mbps, ±10 kV ESD-protected transceiver consumes 30 µA of shutdown current when disabled.
Original Press Release:
Dual Isolated RS232 µModule Transceiver
Dual Isolated RS232 µModule Transceiver Integrates Isolated Power
MILPITAS, CA - - Linear Technology Corporation introduces the LTM2882, a 2-channel isolated RS232 µModule® transceiver that guards against large ground-to-ground differentials and common mode transients. In practical RS232 systems, ground potentials may vary widely from node to node, often exceeding the tolerable range, resulting in an interruption of communications or destruction of a transceiver. The LTM2882 breaks ground loops by isolating the logic level interface and line transceiver using internal inductive signal isolation. This allows for a much larger common mode voltage range plus superior common mode rejection >30kV/µs. A low EMI DC-DC converter generates the power supplies for driving RS232 levels and provides an additional isolated 5V supply output for powering any supporting external components. With 2,500VRMS of galvanic isolation, onboard secondary power and two fully compliant RS232 transmitters and receivers, the LTM2882 requires no external components, providing a complete, small µModule solution for isolated serial data communications.
The LTM2882 addresses a wide range of RS232 applications, including industrial communications and test/measurement equipment, where breaking ground loops or working with large common mode voltages is demanded. The ±10kV ESD-protected transceiver operates at up to 1Mbps and only consumes 30µA of shutdown current when disabled. The two drivers can be enabled and disabled in less than 2µs using the uncommitted auxiliary isolated digital channel and are protected from short-circuits to any voltage within the absolute maximum range of ±15V. Their receiver counterparts are protected from common mode voltages within the absolute maximum range of ±25V. The LTM2882 meets RF and magnetic field immunity test requirements per European standard EN 550024. Users will appreciate how the self-powered LTM2882 takes many precautions to guarantee safe and reliable communications in RS232 systems.
Two versions of the LTM2882 are available to support 3.3V and 5V input supply voltages. The LTM2882 is available in low profile 11.25 x 15mm x 2.8mm surface mount LGA and BGA packages. All integrated circuits and passive components are housed in this Linear Technology, RoHS-compliant µModule package. Pricing starts at $8.45 each in 1,000 piece quantities. Please visit www.linear.com for product selection information.
Summary of Features: LTM2882
Isolator µModule Technology
Isolated RS232 Transceiver: 2500VRMS
Integrated Isolated DC/DC Converter: 1W, 65% Efficiency
No External Components Required
1.62V to 5.5V Logic Supply for Flexible Digital Interface
High Speed Operation
o 1Mbps for 250pF/3kOhm Load
o 250kbps for 1nF/3kOhm Load
o 100kbps for 2.5nF/3kOhm 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 & Across Isolation Barrier
High Common Mode Transient Immunity: 30kV/µs
Common Mode Working Voltage: 560VPEAK
True RS232 Compliant Output Levels
Low Profile (15mm × 11.25mm × 2.8mm) Surface Mount LGA & BGA Packages
About Linear Technology
Linear Technology Corporation, a manufacturer of high performance linear integrated circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major public companies in 2000. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, µModule® products, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems.
LT, LTC, LTM, µModule and are registered trademarks of Linear Technology Corp. All other trademarks are the property of their respective owners.
