ADM488AR
ADM488AR - 250kbps Low-Power RS-485 Transceiver | Analog Devices
The Analog Devices ADM488AR is a 5 V, low-power, full-duplex, slew-rate-limited EIA RS-485/RS-422 differential line transceiver rated for data rates up to 250 kbps in an 8-lead SOIC package. It supports multipoint balanced data transmission while limiting bandwidth to reduce unwanted high-frequency harmonics and reflections. Key verified features include a ±12 V bus common-mode range, 12 kΩ input impedance, and 2 kV EFT protection. The device is intended for industrial, commercial, and instrumentation networks requiring robust differential communications.
An RS-485 transceiver is an interface IC that combines a differential driver and receiver, converting logic-level signals into balanced bus signals and restoring weak or noisy bus logic levels at the receiving endpoint. In the component hierarchy, the ADM488AR is an RS-485 transceiver, an interface IC, a communications semiconductor, and a physical-layer device supporting EIA RS-485 and RS-422 networks. Full duplex provides separate transmit and receive paths, allowing a node to send and receive independently when its bus architecture supports that operation.
The verified electrical features emphasize low power, controlled edges, and multipoint-bus robustness. A single 5 V supply with ±10% tolerance simplifies interface design, while 12 kΩ receiver loading permits more devices on a bus than lower-impedance receivers. The ±12 V common-mode range covers a substantial portion of industrial ground-offset conditions. Slew-rate limiting is particularly useful when slower, rounded edges reduce EMI and ringing, although cable length, topology, termination, and data rate remain system-level constraints.
The ADM488AR family is specified for EIA RS-485 and RS-422 communication, as described by Analog Devices. The AR ordering code identifies the verified surface-mount package configuration, while the manufacturer product page identifies the family as a production product. Exact pin names, temperature range, supply-current limits, receiver thresholds, driver-output levels, package dimensions, and absolute maximum ratings were not available in the supplied excerpts and therefore must be confirmed from the manufacturer datasheet before layout or qualification.
Typical uses include industrial automation links, building-control networks, instrumentation buses, factory equipment, remote sensor interfaces, and embedded data links. The 250 kbps ceiling favors moderate-speed control and monitoring rather than high-bandwidth Ethernet or very fast storage interfaces. In a full-duplex design, pair the driver and receiver with the bus transceiver's specified pins, route differential traces as a controlled impedance pair, and apply termination and biasing only where required by the network architecture.
The principal design consideration is that slew-rate limiting is a system tradeoff rather than a universal solution. Rounded transitions can reduce high-frequency content, but overly slow edges consume signal rise-time budget and may prevent reliable operation at the maximum 250 kbps rate over long cables. PCB symmetry, connector return paths, grounding, cable type, node spacing, common-mode behavior, and protection placement must be validated together.
This page combines verified Analog Devices family information, distributor evidence, sourcing status, interface-application guidance, and a strict drop-in comparison framework. It also distinguishes confirmed specifications from unavailable values, helping engineers identify which details require direct review of the official ADM488 datasheet and package drawings before release to production.
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