ADM238LAN - 120 kbps 4/4 RS-232 Transceiver | Analog Devices
部品番号: ADM238LAN ✓ 生産中ADM238LAN 概要
An RS-232 transceiver is an interface IC that combines line drivers and receivers for serial data links using the EIA-232-E and V.28 standards. It belongs to the broader interface IC hierarchy and converts between low-voltage digital logic levels and the bipolar voltage swings used on an RS-232 cable. The ADM238LAN is especially useful when a system has only a 5 V supply but requires full-duplex RS-232 connectivity rather than single-direction or unbalanced logic-level signaling.
The four drivers provide transmit-side level shifting, while the four receivers support independent receive channels. A 120 kB/s maximum data rate suits industrial equipment, data acquisition systems, service interfaces, embedded controllers, and legacy peripheral connections. The single-supply architecture reduces external power complexity compared with traditional RS-232 designs that require positive and negative supplies, while the onboard converters preserve the bipolar signaling required at the cable interface.
The ADM238LAN family meets EIA-232-E and V.28 requirements and supports a data rate up to 120 kB/s. Its advertised 9 V output swing is adequate for reliable RS-232 signaling in noise-prone industrial environments, and the 30 V receiver input rating provides additional protection against excessive interface voltage. The integrated shutdown function can reduce consumption when the interface is not needed, although applications must account for the device-specific shutdown and receiver-enable timing shown in the manufacturer datasheet.
Typical applications include multi-port RS-232 connections in industrial controllers, laboratory instrumentation, point-of-sale equipment, telecommunications equipment, and embedded systems requiring four transmit and four receive channels. Because the device is a 4/4 transceiver, it supports full-duplex links and can handle bidirectional traffic without separate driver and receiver packages. The 24-pin PDIP package also facilitates prototyping and through-hole service access where fine-pitch surface-mount assembly is undesirable.
The principal design consideration is the external charge-pump capacitor network. Use the required 1 uF capacitors with close PCB placement, observe the stated polarity, and route the high-voltage driver outputs away from sensitive logic and clock lines. Confirm the transceiver’s shutdown behavior in the system power sequence, especially when receivers must remain active while drivers are disabled.
This page combines the manufacturer’s ADM238L product information with interface-family specifications and practical selection guidance. It distinguishes pin-compatible family options from related devices with different driver or receiver counts and highlights the ADM238LAN’s 120 kB/s, four-channel, single-supply architecture for engineers designing robust RS-232 links.
ドロップイン代替品: ADM238LAN — 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: ADM238LAN （同一形状・フットプリント） — 相違点: Maximum Data Rate, Number of Receivers, Product Type, Charge-Pump Capacitor, Driver Output Swing.
ADM238LANZ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADM238LJN
✅ 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 →ADM238LJNZ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADM206AN
✅ 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 →ADM238LAN 仕様
| Product Type | 4/4 full-duplex RS-232 transceiver |
| Number of Drivers | 4 |
| Number of Receivers | 4 |
| Maximum Data Rate | 120 kB/s |
| 電源電圧 | 5 V |
| Minimum Supply Voltage | 4.5 V |
| Maximum Supply Voltage | 5.5 V |
| Output Swing | 9 V with 5 V supply |
| DC-DC Converter | Onboard |
| Charge-Pump Capacitor | 1 uF |
| Receiver Input Level | 30 V |
| Shutdown Feature | Low-power shutdown |
| Receiver Operation in Shutdown | 1 A receivers active in shutdown |
| RS-232 Compliance | EIA-232-E and V.28 |
| パッケージ | 24-pin PDIP |
| 実装タイプ | Through-hole |
ADM238LAN 24-pin pdip ピン配置ガイド
ADM238LAN (24-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: ADM238LAN.
詳細は データシート をご参照ください。
主な用途
ADM238LAN の用途: 6 件s: Industrial RS-232 Controller, Laboratory Instrumentation, Embedded Serial Communication, Point-of-Sale Equipment, Telecommunications Equipment, Legacy Peripheral Adapter.
Industrial RS-232 Controller
The ADM238LAN fits industrial controllers that need several RS-232 ports while operating from a 5 V logic rail. Four drivers and four receivers support bidirectional equipment links, and the 120 kB/s rate covers common supervisory and configuration protocols. Its onboard DC-DC converters eliminate the need for a separate negative interface supply, while 9 V output swing and 30 V receiver input levels provide useful margin for cabling between cabinet-mounted equipment. The 24-pin PDIP format is particularly convenient for serviceable industrial controller boards. Use the manufacturer charge-pump layout and keep the external 1 uF capacitors close to the device.
おすすめ
Laboratory Instrumentation
The ADM238LAN is useful in laboratory instruments that expose multiple RS-232 ports to external analyzers, fixtures, or legacy test equipment. Four transmitters can send commands or results, and four receivers can acquire data from separate devices, reducing the number of interface packages required on the board. Its 120 kB/s maximum rate is suitable for many laboratory control protocols, while the single 5 V supply simplifies integration with digital control circuitry. For benchtop instruments, the through-hole PDIP package supports assembly and repair. Protect long external cables according to the interface and grounding recommendations in the manufacturer datasheet.
おすすめ
Embedded Serial Communication
The ADM238LAN can connect an embedded controller to several RS-232 peripherals without requiring a separate bipolar supply. Four full-duplex channels make it appropriate for boot consoles, configuration ports, sensors, and service interfaces that use legacy serial protocols. At up to 120 kB/s, the device covers common command-and-response traffic while its low-power shutdown capability can reduce consumption during idle operating phases. The 30 V receiver input rating adds tolerance to external cable transients, although it is not a substitute for external surge protection. Validate signal levels, cable length, and grounding for the deployed environment.
おすすめ
Point-of-Sale Equipment
The ADM238LAN suits point-of-sale systems that need to connect peripherals such as scales, printers, card readers, and customer displays. Four driver and four receiver channels allow consolidation of several serial links, while the 5 V supply matches common embedded terminal electronics. The 120 kB/s rate is sufficient for many short-distance peripheral protocols, and the onboard converters reduce the number of external power rails. The 24-pin PDIP package is helpful for products designed for easy assembly or field replacement. Maintain separation between outgoing and incoming cable routes where practical to reduce coupling and improve system reliability.
おすすめ
Telecommunications Equipment
The ADM238LAN can provide multiple RS-232 service and supervisory connections in telecommunications equipment where only a 5 V supply is available. Four transmit and four receive channels are useful for connecting management units, monitoring modules, or field-service equipment to common control boards. Its 120 kB/s data rate and EIA-232-E and V.28 compatibility align with conventional asynchronous serial links. The 9 V driver swing improves signal margin on board-level or short external connections. Where cables extend beyond the equipment enclosure, apply appropriate surge and ESD protection according to the system’s isolation and grounding design.
おすすめ
Legacy Peripheral Adapter
The ADM238LAN is a practical choice for an adapter board that bridges modern 5 V controller logic to legacy RS-232 peripherals. Four full-duplex channels support several device connections, and the 120 kB/s rate accommodates many legacy printer, measurement, and configuration interfaces. Its integrated DC-DC converters avoid requiring both positive and negative rails at the adapter, while the PDIP package remains convenient for a through-hole industrial accessory. Place the four external 1 uF capacitors according to the manufacturer layout and keep the RS-232 traces away from sensitive analog or high-speed digital paths. Verify the legacy device’s logic levels and handshake requirements.
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: ADM238LAN — 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 | ADM238LANZ | ADM238LJN | ADM238LJNZ | ADM206AN |
|---|---|---|---|---|---|
| Package | 24-PDIP | 24-PDIP | 24-DIP | 24-DIP | 24-PDIP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Driver / Receiver Count | 4 / 4 | 4 / 4 | 4 / 4 | 4 / 4 | 4 / 3 |
| Transceiver Function | Full RS-232 transceiver | Full RS-232 transceiver | RS-232 transceiver | RS-232 transceiver | RS-232 transceiver |
主な差別化要因
- Four receive channels in a single interface IC （vs ADM206AN)
- Full 4/4 channel utilization （vs ADM238LANZ)
- Single-supply multi-port RS-232 integration （vs ADM238LJN)
設計ノート
Place all four required 1 uF charge-pump capacitors close to their designated ADM238LAN pins. Keep the associated high-voltage traces short, observe capacitor polarity, and avoid routing them beneath the device where coupling to adjacent channels could increase noise. Follow the manufacturer application diagram when laying out the charge-pump network because long or poorly terminated traces can reduce converter performance and disturb the RS-232 output waveform.
Separate outbound RS-232 driver traces from receiver inputs and sensitive board-level signals. Driver outputs use bipolar swings approaching 9 V, so adjacent routing can create avoidable coupling even in a digital system. Use a ground reference within the cable or board interface where the system architecture permits, and provide external surge protection for cables that leave the enclosure. Verify the final interface against EIA-232-E and V.28 requirements.
Do not select the ADM206AN as an unconditional substitute for the ADM238LAN. Both use a 24-pin PDIP package and support four drivers at 120 kB/s, but the ADM206AN has three receivers rather than four, creating a 25% reduction in receive-channel count. Check every pin, the receiver count, supply current, shutdown behavior, and thermal limits before approving that substitution.
コンプライアンス情報
The Analog Devices ADM238L product page identifies the family as production, but the available product information does not state the requested compliance classifications for the ADM238LAN.