ADM232LJN - 5V RS-232 Transceiver | Analog Devices
Référence : ADM232LJN ✗ Fin de vieADM232LJN Présentation
An RS-232 transceiver is an interface IC that combines differential signal drivers and receivers for serial data communication over single-ended, bipolar RS-232 links. The transmitter converts logic-level signals into RS-232 levels, while the receiver converts bipolar RS-232 inputs back into CMOS-compatible logic levels. In the product hierarchy, an RS-232 transceiver is a line driver/receiver, a communications interface IC, and a semiconductor designed to bridge modern digital logic and older serial-interface equipment.
The ADM232LJN combines a single 5 V supply with onboard charge-pump DC-DC converters, allowing the device to generate the bipolar voltage levels needed for RS-232 transmission without separate ±12 V rails. Its specified 120 kB/s data rate supports legacy serial ports, industrial equipment, and control systems. The approximately ±9 V output swing provides the required interface voltage amplitude while the CMOS implementation supports operation from one 5 V supply.
The interface also includes low-power shutdown to reduce power dissipation when the link is not active. The receivers are specified as active in shutdown, allowing selected receive paths to remain operational during a low-power state. The use of small 1 µF capacitors makes the charge-pump and supply bypassing network relatively compact, which is useful in equipment where PCB area is constrained.
Typical applications include legacy PC serial ports, industrial instrumentation, barcode scanners, test equipment, embedded control systems, and communications links to equipment designed for EIA-232-E or V.28 interfaces. The device is particularly useful where the system has a 5 V logic rail but the connected peripheral requires RS-232 signal levels.
Designers should preserve the intended capacitor values, place charge-pump capacitors close to their specified pins, and route the RS-232 connector and cable interface away from sensitive analog or high-speed digital circuitry. The verified ADM232LJN data confirms a 16-pin PDIP package and a 120 kB/s data rate, but it does not provide a complete public pin-by-pin pinout or current distributor price table in the supplied material.
This page consolidates the verified manufacturer and distributor information, separates confirmed specifications from unavailable data, and identifies a confirmed same-package family alternative. It also provides practical selection guidance for engineers choosing between single-supply RS-232 transceivers and legacy multi-rail implementations.
Alternatives de remplacement direct pour ADM232LJN — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
ADM232LJNZ
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ADM232LJN Spécifications
| Product Type | RS-232 transceiver |
| Transmitter and Receiver Configuration | 2 transmitters and 2 receivers |
| Tension d'alimentation | 5 V |
| Débit de données | 120 kB/s |
| Supported Standards | EIA-232-E and V.28 |
| RS-232 Output Swing | Approximately ±9 V from a 5 V supply |
| On-Board DC-DC Converters | Yes |
| Required Charge-Pump Capacitors | 1 µF |
| Low-Power Shutdown | Yes |
| Receivers Active in Shutdown | Yes |
| Maximum Receiver Input Voltage | 30 V |
| Boîtier | 16-pin PDIP |
| Type de montage | Through-hole |
| Température de fonctionnement | 0°C to 70°C |
| Statut du cycle de vie | Obsolete |
Guide de configuration des broches du ADM232LJN 16-pin pdip
Configuration des broches du ADM232LJN (boîtier 16-pin pdip). La numérotation des broches, les fonctions et les schémas de connexion sont définis dans la fiche technique du fabricant. Consultez-la pour l'empreinte exacte et les directives de soudage.
Aucune donnée de brochage détaillée disponible pour ADM232LJN.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
ADM232LJN convient pour 6 applications: Legacy PC Serial Interfaces, Industrial Control Systems, Test and Measurement Equipment, Barcode and Identification Systems, Embedded Diagnostic Ports, Instrumentation and Remote Sensors.
Legacy PC Serial Interfaces
The ADM232LJN fits legacy PC and peripheral serial interfaces because it provides two RS-232 transmitters, two receivers, and a 120 kB/s data rate from one 5 V supply. The integrated DC-DC converters avoid a separate ±12 V source, while approximately ±9 V output swing supports conventional EIA-232-E and V.28 signaling. In a legacy controller, the device can sit between a CMOS UART and an external DB9 or equivalent connector. The 16-pin PDIP package favors through-hole or socketed industrial designs, and its 0°C to 70°C operating range should be checked against the enclosure temperature.
Recommandé
Industrial Control Systems
The ADM232LJN is suitable for industrial control equipment that communicates with older RS-232 sensors, controllers, or service ports through a 5 V logic rail. Its 120 kB/s rate covers many legacy supervisory and configuration protocols, while the onboard DC-DC converters reduce the need for a bipolar power tree. Place the transceiver near the connector-side circuitry and keep charge-pump and bypass capacitors short to their pins. The published 0°C to 70°C range supports ordinary indoor industrial environments, but not extended-temperature machinery without an alternative part rated for the full ambient range.
Recommandé
Test and Measurement Equipment
The ADM232LJN can provide a compact RS-232 control link in test and measurement instruments that expose configuration or command ports to legacy host computers. A single 5 V supply is convenient for portable and benchtop equipment, and the 120 kB/s data rate is more than adequate for many low-speed command protocols. The approximately ±9 V transmitter swing helps maintain compatible RS-232 levels without external negative-rail generation. Designers should separate the cable-side routing from sensitive measurement circuitry and verify that the instrument’s protocol timing is compatible with the 120 kB/s transceiver limit.
Recommandé
Barcode and Identification Systems
The ADM232LJN suits barcode readers, identification terminals, and handheld equipment that communicate through an RS-232 command interface from a 5 V-powered embedded platform. Its two transmitters and two receivers support a full duplex serial arrangement, while the 120 kB/s rated speed accommodates common scanner data bursts and short command exchanges. Integrated DC-DC conversion removes the need for a discrete ±12 V source in compact designs. Because the verified temperature rating is 0°C to 70°C, a mobile reader used in a hot vehicle or outdoor enclosure may require a wider-temperature alternative.
Recommandé
Embedded Diagnostic Ports
The ADM232LJN is appropriate for embedded systems that retain a service or diagnostic connector using RS-232 rather than USB or Ethernet. A 5 V-only circuit can connect CMOS UART logic to the bipolar interface through the integrated converters, supporting a 120 kB/s data rate and two receive channels. The PDIP package is useful for prototypes, legacy industrial boards, and socketed production assemblies. Keep the diagnostic connector away from high-current switching nodes and verify ground continuity in long cable installations, since common-mode voltage and ground offset can affect receiver reliability.
Recommandé
Instrumentation and Remote Sensors
The ADM232LJN can bridge a 5 V embedded controller to legacy instrumentation or remote sensors that expose EIA-232-E or V.28 ports. The 120 kB/s rate is suitable for commands, status reports, and periodic measurements rather than high-throughput streaming. Its onboard DC-DC converters and small 1 µF capacitors simplify analog or mixed-signal boards where space is limited. For long cable runs, retain the interface ground reference and follow the manufacturer’s grounding guidance; the verified 30 V receiver input capability improves tolerance to static input voltage but does not remove the need for correct signal-level design.
Recommandé
Données de référence d'ingénierie pour ADM232LJN — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ADM232LJNZ |
|---|---|---|
| Package | 16-pin PDIP | 16-pin PDIP |
| Brand | Analog Devices | Analog Devices |
| Product Type | RS-232 transceiver | RS-232 transceiver |
| Supply Voltage | 5 V | 5 V |
| Data Rate | 120 kB/s | 120 kB/s |
| Transmitter Count | 2 | 2 |
| Receiver Count | 2 | 2 |
| Output Swing | Approximately ±9 V from a 5 V supply | Approximately ±9 V from a 5 V supply |
| Low-Power Shutdown | Yes | Yes |
Principaux différenciateurs
- Single-supply RS-232 operation (vs ADM232LJNZ)
- Integrated bipolar voltage generation (vs ADM232LJNZ)
- Full-duplex RS-232 channel count (vs ADM232LJNZ)
- Low-power interface operation (vs ADM232LJNZ)
Notes de conception
Place the specified 1 µF charge-pump capacitors and supply bypass components directly beside their associated ADM232LJN pins. Keep these short connections away from the RS-232 connector and cable routing. The transceiver’s integrated DC-DC converters generate bipolar levels internally, so capacitor placement and return-current control are important for stable output swing and reduced radiated or conducted interference.
Route the two RS-232 driver outputs as a matched, compact pair toward the connector, and route receiver inputs away from switching power nodes. Do not treat the logic ground and cable-side RS-232 reference ground as interchangeable without considering potential ground offsets. A clear isolation boundary between the cable interface and sensitive logic reduces susceptibility to common-mode voltage and electrostatic-discharge events.
The ADM232LJN requires a single 5 V supply, eliminating separate ±12 V rails, but the 5 V source still needs adequate local decoupling. Confirm the regulator can supply the device’s required current and that its startup behavior does not create an unacceptable transient at the interface. Low-power shutdown can reduce dissipation when the link is inactive, while the receivers may remain active for monitoring during shutdown.
Do not assume that any similarly described RS-232 transceiver is a direct replacement. The target uses a 16-pin PDIP package, and a substitute must match the power pins, charge-pump capacitor connections, shutdown behavior, driver and receiver assignments, and logic levels. Also verify that legacy equipment tolerates the approximately ±9 V output swing and that the host UART does not exceed the 120 kB/s interface rating.
Informations de conformité
The supplied verified data confirms EIA-232-E and V.28 support but does not provide RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations. AEC-Q100 is not applicable to this legacy communications interface based on the supplied product information.