Analog Devices Inc. LTM2882CV-3#PBF

Overview

LTM2882CV-3#PBF from Analog Devices is a galvanically isolated dual RS232 µModule transceiver with integrated 5V isolated DC/DC converter (100mA output), 2500VRMS isolation, and independent 1.62V–5.5V logic supply (VL). It supports 1Mbps data rate under 250pF/3kΩ load and enables ground-loop-free industrial serial communication in test equipment and PLC interfaces.

For engineers reviewing the LTM2882CV-3#PBF datasheet, LTM2882CV-3#PBF pinout, LTM2882CV-3#PBF application, or LTM2882CV-3#PBF equivalent, key selection criteria include its 3.3V input operation, LGA-32 package, ±10kV HBM ESD protection on RS232 pins, 30kV/µs common-mode transient immunity, and auxiliary isolated digital channel for half-duplex DE control.

Technical Context

The LTM2882CV-3#PBF implements coreless transformer-based µModule isolation to encode/decode signals across the barrier, with priority-based timing (T1IN/R1IN jitter-free, T2IN/R2IN/DIN subject to ±6ns pulse-width uncertainty). Its integrated full-bridge DC/DC converter operates at ~2MHz, feeding a voltage-doubler rectifier and LDO to deliver regulated 5V_VCC2 with <±100mV load regulation up to 100mA.

It features dual independent RS232 transceivers compliant with TIA/EIA-232-F, each with true ±5.7V driver swing and 5kΩ receiver input impedance. The VL pin decouples logic-level interfacing from VCC, enabling simultaneous operation at 3.3V (VCC) and 1.8V/2.5V/5V (VL) without sequencing constraints.

Key Specifications

Pinout & Package

Package: 32-pin LGA (15mm × 11.25mm × 2.8mm), RoHS-compliant Au finish, MSL Level e4.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolated RS232 transceiver applications.

Compared with ADM2483BRWZ and ISO3082DWR, the LTM2882CV-3#PBF uniquely integrates dual RS232 channels, 2500VRMS isolation, 100mA isolated 5V supply, and a programmable VL pin-reducing component count, simplifying layout, and enabling mixed-voltage, ground-loop-free serial connectivity in one LGA package.

Availability

LTM2882CV-3#PBF is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, medical diagnostics, and energy metering applications requiring stable component supply, long-term lifecycle support, and certified isolation performance.

Supply support for LTM2882CV-3#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices (now part of Analog Devices, Inc., a wholly owned subsidiary of Analog Devices, Inc.) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LTM2882CV-3#PBF belongs to the µModule isolated interface product line, designed to simplify robust, safety-certified serial communication in electrically noisy or ground-differentiated environments such as factory floors and medical systems.

FAQ

What is the maximum load current supported by the LTM2882CV-3#PBF's isolated VCC2 supply?

The LTM2882CV-3#PBF provides up to 100mA from its regulated 5V VCC2 output while maintaining ±100mV regulation. This is sufficient to power both internal RS232 drivers/receivers and small external loads like level shifters or optocoupler LEDs. Exceeding 100mA may cause VCC2 droop or thermal derating; the datasheet specifies 4.7V minimum at 100mA load.

Does the LTM2882CV-3#PBF require external decoupling capacitors?

No external decoupling capacitors are required for basic operation-the LTM2882CV-3#PBF integrates 2.2µF ceramic capacitors for VCC, VL, and VCC2. However, a 6.8–22µF bulk capacitor is recommended near the input to suppress hot-plug transients, and a 1–4.7µF low-ESL ceramic cap is advised for EMI-sensitive layouts. These are system-level enhancements, not functional prerequisites.

How does the LTM2882CV-3#PBF achieve half-duplex RS232 operation?

The LTM2882CV-3#PBF uses its auxiliary isolated DIN→DOUT channel to drive the DE (driver enable) pin. By connecting DOUT to DE, a single logic signal can simultaneously enable/disable both T1OUT and T2OUT in <2µs. This eliminates timing skew between channels and avoids the need for external logic or delay matching, enabling clean half-duplex control directly from the logic side.

What is the significance of the "CV" suffix in LTM2882CV-3#PBF?

The "CV" denotes the LGA package variant (vs "CY" for BGA) and commercial temperature grade (0°C to 70°C). The "-3" indicates 3.3V nominal input operation (3.0–3.6V range), and "#PBF" confirms lead-free, RoHS-compliant packaging with Au terminal finish. This exact combination ensures compatibility with 3.3V systems, surface-mount assembly, and standard commercial environmental requirements.

Can the LTM2882CV-3#PBF interface with 1.8V logic without level shifters?

Yes-the VL pin accepts 1.62V to 5.5V, so applying 1.8V to VL configures R1OUT, R2OUT, T1IN, T2IN, DIN, and ON for 1.8V logic thresholds. Input hysteresis (150mV) and output drive (VOH = VL–0.4V, VOL = 0.4V) ensure noise margin and compatibility with standard 1.8V CMOS interfaces-no external level translation is needed.