ADM489AN - Low-Power RS-485/RS-422 Transceiver | Analog Devices
部品番号: ADM489AN ✗ 生産終了ADM489AN 概要
An RS-485/RS-422 transceiver is an interface integrated circuit that converts between single-ended logic signals and differential line signals. The differential receiver evaluates the voltage difference between the positive and negative bus conductors, improving noise immunity and allowing reliable data transmission over longer cable runs. In a multipoint network, multiple transceivers can share the same bus when the network is properly terminated and configured. The ADM489 family combines this physical-layer signaling function with low-power operation and slew-rate-controlled outputs.
The verified product information identifies the ADM489 as a single RS-422/RS-485 transceiver with one driver and one receiver. Its 4.5 V to 5.5 V supply range is suitable for conventional 5 V digital systems, while the 14-pin PDIP package supports through-hole PCB assembly and prototype development. The product is suitable for industrial control equipment, data acquisition systems, instrument interfaces, building automation equipment, and other balanced communication links. The ADM489AN designation identifies the Analog Devices PDIP-14 version of the ADM489 family.
The differential bus interface allows the transmitter and receiver to share the same physical cable pair. In a transmitting state, the driver produces a differential voltage across the bus. In a receiving state, the receiver converts that differential voltage into a logic-level output for the host controller or digital interface. This arrangement reduces sensitivity to common-mode voltage and electrical noise relative to single-ended signaling. Proper cable length, termination, grounding, and transceiver configuration remain important because the transceiver does not remove the need for correct network design.
A typical RS-485 application connects the transceiver between a microcontroller or programmable logic controller and a field bus. The microcontroller drives the transmitter input and receives the receiver output, while the transceiver connects to the A and B differential conductors. An RS-422 point-to-point system can also use the same type of balanced interface. Because the ADM489AN operates from a 4.5 V to 5.5 V supply, the surrounding logic must use compatible voltage levels and provide suitable input and output interfacing.
For PCB layouts using the PDIP-14 version, place decoupling capacitors close to the supply pins and route the differential bus with matched, symmetric geometry wherever practical. Keep the transceiver-side bus traces away from noisy switching nodes and high-current return paths. Termination should be placed at the physical ends of the bus rather than at every node. The receiver and driver enable functions should be controlled so that the bus is not driven in an unintended state during reset or power sequencing.
This product page combines the verified Analog Devices product information, distributor package details, pricing availability, and cross-reference findings for the ADM489AN. It also highlights the practical RS-485/RS-422 design considerations that are not apparent from the part number alone: the 4.5 V to 5.5 V supply range, the 14-pin PDIP package, the single-driver/single-receiver architecture, and the requirement to validate each candidate replacement against the original datasheet before PCB substitution.
ドロップイン代替品: ADM489AN — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: ADM489AN （同一形状・フットプリント） — 相違点: Package, Product Type.
ADM489ANZ
✅ ドロップイン価格はお問い合わせください
データシートを見る →MAX489ECPD+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX489ECPD
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADM489AN 仕様
| Product Type | RS-485/RS-422 differential line transceiver |
| Number of Drivers | 1 |
| Number of Receivers | 1 |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Supported Standards | EIA RS-485 and RS-422 |
| トポロジー | Full-duplex differential line transceiver |
| データレート | 250 kbps |
| Driver Output Type | Slew-rate limited |
| Power Consumption | Low power |
| パッケージ | 14-pin PDIP |
| 実装タイプ | Through-hole |
ADM489AN 14-pin pdip ピン配置ガイド
ADM489AN (14-pin pdip パッケージ) のピン配置。 ピン番号、機能、接続図はメーカーのデータシートで定義されています。正確なフットプリントとはんだ付けのガイドラインについては、データシートを参照してください。
詳細なピン配置データはありません: ADM489AN.
詳細は データシート をご参照ください。
主な用途
ADM489AN の用途: 6 件s: Industrial RS-485 Control Networks, RS-422 Point-to-Point Data Links, Building Automation Equipment, Data Acquisition and Instrumentation, Embedded Communication Modules, Telecommunications and Remote Monitoring.
Industrial RS-485 Control Networks
The ADM489AN fits industrial control links that require one balanced RS-485 transmitter and one receiver operating from a 4.5 V to 5.5 V supply. It can connect a controller, sensor hub, or remote I/O module to the A and B conductors of a multidrop field bus, supporting data rates up to the verified 250 kbps limit. Its differential signaling and slew-rate-limited output improve compatibility with longer, terminated cable runs compared with an unbalanced single-ended interface. Engineers should preserve symmetric routing between the bus conductors and provide the correct termination at the physical ends of the network.
おすすめ
RS-422 Point-to-Point Data Links
The ADM489AN is suitable for balanced point-to-point RS-422 communication between two equipment locations where common-mode noise reduction is important. The verified device provides one driver and one receiver, a 4.5 V to 5.5 V operating range, and operation up to 250 kbps. A transmitting endpoint uses the driver outputs, while the remote endpoint uses the receiver output to feed local logic. Cable routing should use a twisted pair with consistent impedance and controlled termination, and the design must verify the applicable RS-422 receiver thresholds before release.
おすすめ
Building Automation Equipment
The ADM489AN can provide the physical layer for building-automation controllers, HVAC panels, sensors, and access-control equipment using balanced RS-485 communication. Its 4.5 V to 5.5 V supply range fits common embedded control platforms, while the 250 kbps maximum data rate is appropriate for supervisory control and status traffic rather than high-bandwidth payload transfer. Install termination only at the ends of the bus and keep transceiver routing away from relay coils, switching supplies, and motor-control traces to preserve noise immunity on the differential pair.
おすすめ
Data Acquisition and Instrumentation
The ADM489AN is appropriate for laboratory and process-instrumentation links that distribute measurements from remote sensors to a central controller. Differential RS-485 or RS-422 signaling helps reject common-mode interference encountered near motors, relays, and powered equipment, while the verified slew-rate-limited output reduces high-frequency bus-edge energy. The device should be paired with proper shielded cabling, a defined grounding strategy, and carefully selected termination. System engineers must also observe the 250 kbps data-rate ceiling when choosing sensor sampling and packet timing.
おすすめ
Embedded Communication Modules
The ADM489AN can serve as the bus interface for compact embedded modules that must exchange commands or status with a host over a balanced conductor pair. The 14-pin PDIP format is particularly useful for through-hole industrial controller boards, prototypes, and systems assembled with mixed-component processes. The controller supplies compatible 5 V logic levels, and the transceiver provides the differential driver and receiver functions required at the physical layer. Firmware should avoid enabling the driver while the bus direction is undefined, especially during reset, watchdog recovery, or hot-swap events.
おすすめ
Telecommunications and Remote Monitoring
The ADM489AN can support low-rate remote-monitoring links in telecommunications, alarm, and environmental monitoring equipment where a wired balanced interface is more dependable than a long single-ended connection. Its 1-driver/1-receiver arrangement supports one endpoint per device, and the verified 250 kbps limit accommodates supervisory commands and periodic telemetry. For multi-node installations, use unique addresses and controlled bus direction, terminate the cable at both ends, and isolate the transceiver from high-energy surge paths as required by the deployment environment.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ADM489AN — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | ADM489ANZ | MAX489ECPD+ | MAX489ECPD |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Maxim Integrated | Maxim Integrated |
| Package | PDIP-14 | PDIP-14 | PDIP-14 | PDIP-14 |
| Product Type | Single RS-422/RS-485 transceiver | Single RS-422/RS-485 transceiver | RS-485/RS-422 transceiver | RS-485/RS-422 transceiver |
| Number of Drivers | 1 | 1 | 1 | 1 |
| Number of Receivers | 1 | 1 | 1 | 1 |
| Driver Output | Slew-rate limited | Slew-rate limited | Slew-rate limited | Slew-rate limited |
主な差別化要因
- Original manufacturer's PDIP-14 sourcing path （vs MAX489ECPD+)
- Verified single-driver and single-receiver configuration （vs ADM489ANZ)
- Documented ESD-protection option in the cross-brand comparison （vs ADM489AN)
設計ノート
Route the differential bus as a matched pair with consistent spacing and minimize stubs to the transceiver. Keep the A and B conductors away from switching-node copper, relay traces, and high-current return paths. Place the transceiver close to the connector or protection network, and provide a common reference ground according to the applicable RS-485 or RS-422 system design. The verified material does not specify the exact ADM489AN pin numbers, so confirm the schematic against the manufacturer datasheet before assigning supply, enable, driver, and receiver nets.
Operate the ADM489AN only within its verified 4.5 V to 5.5 V supply range. Place the required bypass capacitor adjacent to the device supply pins and provide adequate return-path copper. The verified excerpts do not include supply-current, quiescent-current, or output-current values, so a numeric power budget cannot be calculated without the datasheet. Verify whether receiver and driver enable states alter current consumption and confirm that the upstream regulator can support the selected operating mode.
Do not substitute the ADM489AR into an ADM489AN board without redesigning the footprint: the former is listed as 14-pin SOIC and the latter as 14-pin PDIP. Also do not assume that a shared package proves full drop-in equivalence. Review driver enable polarity, receiver thresholds, fail-safe behavior, common-mode limits, temperature grade, and ESD rating before approving ADM489ANZ, MAX489ECPD+, or MAX489ECPD. For buses, install termination only at the physical endpoints and avoid multiple driver outputs fighting during control-state transitions.
コンプライアンス情報
The supplied verified excerpts do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. EIA RS-485 and RS-422 are interface standards rather than material-compliance certifications. No compliance status has been inferred.