ADM233LJN - 2/2 RS-232, 5V, 120kbps | Analog Devices
Артикул: ADM233LJN ✓ АктивенADM233LJN Обзор
An RS-232 transceiver is an interface IC that converts logic-level digital signals into differential bipolar transmission signals and converts received bipolar signals back into CMOS logic levels. The ADM233LJN belongs to the RS-232 transceiver category, where it bridges the gap between low-voltage digital systems and the voltage-tolerant, ground-referenced communication interface historically defined by RS-232.
Key features include one 5 V supply, two driver and two receiver channels, operation at 120 kbit/s, onboard DC-DC conversion, ±9 V output swing, low-power shutdown, and 1 µF external charge-pump capacitors. The receiver input withstands voltages up to 30 V, while shutdown keeps the receivers active, allowing a connected system to retain incoming data during a local transmitter shutdown.
The integrated charge-pump architecture eliminates the need for a separate ±12 V supply and reduces external component count compared with conventional RS-232 implementations. The transmitter actively drives the RS-232 signal levels, while the receiver provides noise tolerance and level translation for incoming data. This makes the device suitable for equipment in which a modern 5 V logic supply is available but a legacy computer serial port is not.
Typical applications include industrial serial adapters, point-of-sale terminals, instrumentation, barcode scanners, security equipment, and embedded control systems. The ADM233LJN is particularly useful when a PCB must implement a full RS-232 port using only a 5 V rail and through-hole assembly, while its integrated converters reduce the external power-tree complexity.
Designers should verify the external charge-pump capacitor values, connector protection, and ground arrangement against the manufacturer datasheet. Although the receiver tolerates inputs up to 30 V, exposed RS-232 connectors should receive appropriate surge and electrostatic-discharge protection. Decoupling and charge-pump capacitor placement also require careful PCB layout to minimize switching noise and data errors.
This page combines verified manufacturer specifications, current sourcing information, drop-in replacement analysis, and practical application guidance. It also distinguishes verified electrical differences from unknown parameters so engineers can assess PCB, regulatory, and lifecycle implications before committing to a design.
Аналоги без доработки для ADM233LJN — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с ADM233LJN (тот же форм-фактор и посадочное место).
ADM232LJN
✅ Прямая заменаУточнить цену
Открыть даташит →ADM233LAN
✅ Прямая заменаУточнить цену
Открыть даташит →ADM233LANZ
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ADM233LJNZ
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MAX3218EPP
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ADM233LJN Характеристики
| Напряжение питания | 5 V |
| Interface Standard | RS-232 |
| Transceiver Configuration | 2 driver and 2 receiver channels |
| Maximum Data Rate | 120 kbit/s |
| Output Swing | ±9 V |
| Charge-Pump Capacitor Value | 1 µF |
| DC-DC Converter | On-board |
| Receiver Input Voltage Rating | 30 V |
| Receiver Shutdown Behavior | Receivers remain active during shutdown |
| Power-Saving Mode | Low-power shutdown |
| Compliance Standard | EIA-232-E and V.28 |
| Корпус | 20-pin PDIP |
| Тип монтажа | Through-hole |
| Logic Supply Level | 5 V CMOS |
Руководство по цоколевке ADM233LJN в корпусе 20-pin pdip
Цоколевка для ADM233LJN (корпус 20-pin pdip). Нумерация выводов, функции и схемы подключения определены в техническом описании производителя. Обратитесь к нему для точного посадочного места и рекомендаций по пайке.
Нет подробных данных о распиновке для ADM233LJN.
Обратитесь к даташиту для полной конфигурации выводов.
Типичное применение
ADM233LJN подходит для 6 применениеs: Industrial Serial Control Interface, Point-of-Sale Terminal Interface, Instrumentation and Test Equipment, Barcode and Data-Collection Equipment, Security and Access-Control Equipment, Embedded Service and Maintenance Port.
Industrial Serial Control Interface
The ADM233LJN fits legacy RS-232 equipment that must communicate with a 5 V embedded controller. Its two-driver, two-receiver arrangement supports bidirectional control and status signaling, while the 120 kbit/s rate is adequate for many configuration, diagnostic, and command protocols. The onboard DC-DC converters eliminate a separate ±12 V rail, leaving only a 5 V supply and the documented 1 µF charge-pump capacitors. In an industrial enclosure, the 30 V receiver input rating provides useful tolerance for bipolar RS-232 signals, but surge protection, proper grounding, and cable-level EMI control remain necessary. The device is most appropriate when the PCB already uses a PDIP-20 footprint and a sustained 120 kbit/s link is sufficient.
Рекомендуется
Point-of-Sale Terminal Interface
The ADM233LJN can provide the RS-232 connection used by point-of-sale peripherals, receipt equipment, or service terminals that rely on a 5 V embedded system. Two driver and two receiver channels allow command transmission and acknowledgment signals without adding multiple interface packages, and the maximum 120 kbit/s data rate covers many legacy peripheral protocols. Its single 5 V supply and integrated DC-DC conversion reduce the power supply burden inside compact point-of-sale equipment. The design must still provide correct charge-pump capacitors, a suitable connector, chassis grounding, and protection against cable-borne transients. Using the documented PDIP-20 footprint also helps preserve through-hole serviceability in equipment assembled over a long product life.
Рекомендуется
Instrumentation and Test Equipment
The ADM233LJN is suitable for laboratory and field instrumentation that exposes a legacy RS-232 configuration port while internally running on 5 V logic. Its approximately ±9 V output swing and 120 kbit/s throughput are appropriate for command transfer, remote adjustment, firmware downloading, and equipment status reporting. Because the receiver remains active during shutdown, a host can potentially retain inbound information even when local transmission is disabled, a useful behavior in shared-port systems. Designers should maintain a clear ground reference between connected equipment, use short and shielded cables where appropriate, and add connector-side transient protection. A logic-level protocol analyzer or interface bridge can assist with validation, while the ADM233LJN remains the board-level RS-232 transceiver.
Рекомендуется
Barcode and Data-Collection Equipment
The ADM233LJN can support a 5 V barcode scanner, data terminal, or handheld accessory connected through an RS-232 interface. The two-channel arrangement permits simultaneous command output and scanner response, while 120 kbit/s is generally compatible with legacy scanner data rates and short command exchanges. Its integrated charge-pump circuitry avoids the extra supply rails that would complicate compact portable or fixed data-collection equipment. Because these systems may expose an external connector to user contact and electrostatic discharge, the interface path should be reviewed for protection, grounding, and cable routing. The device’s PDIP-20 package is useful for repairable or through-hole industrial designs, although a surface-mount RS-232 option may be preferable where board area is more constrained.
Рекомендуется
Security and Access-Control Equipment
The ADM233LJN can implement the RS-232 link used by access-control readers, controllers, or alarm panels that require a legacy serial interface alongside 5 V electronics. Two transmitters and two receivers provide useful flexibility for command-and-response or multi-device wiring, and the 120 kbit/s rate supports administrative traffic rather than high-bandwidth payload transfer. The single-supply architecture simplifies internal power distribution, but exposed security equipment should include robust transient and ESD protection at the connector. Designers should also verify shutdown behavior against the controller’s expected state and ensure that the RS-232 ground is connected correctly to avoid false communication failures. Because compliance and automotive qualification were not supplied for the exact ordering code, product-specific regulatory requirements must be assessed separately.
Рекомендуется
Embedded Service and Maintenance Port
The ADM233LJN is useful for an embedded system that must offer a conventional service connector for configuration, diagnostics, firmware transfer, and field upgrades. The two-driver, two-receiver structure supports bidirectional maintenance traffic, and 120 kbit/s provides adequate throughput for many command-oriented protocols. Running from one 5 V rail simplifies service-board integration in legacy equipment, while onboard DC-DC converters remove the need for a bipolar supply. The implementation should expose only the required signals, include connector protection, and use a defined serial protocol with timeout and retry behavior. The receiver’s ability to stay active during shutdown may assist systems that must monitor incoming service requests, although engineers should confirm the complete shutdown truth table in the manufacturer datasheet before relying on that behavior in a safety-critical sequence.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для ADM233LJN — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | ADM232LJN | ADM233LAN | ADM233LANZ | ADM233LJNZ | MAX3218EPP |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Maxim Integrated |
| Package | 20-pin PDIP | 20-pin PDIP | 20-pin PDIP | 20-pin PDIP | 20-pin PDIP | 20-pin PDIP |
Ключевые отличия
- Single-supply RS-232 with integrated bipolar drive (против MAX3218EPP)
- Receivers remain active during local shutdown (против ADM232LJN)
- Documented full-duplex channel count (против MAX3218EPP)
- Verified 120 kbit/s communication rate (против ADM233LAN)
Заметки по проектированию
Place the two 1 µF charge-pump capacitors and the ADM233LJN as close together as the manufacturer's application diagram permits. Keep switched-capacitor loop current within the smallest practical PCB area and connect the device ground to the interface reference ground through a low-impedance path. The supplied verified snippets do not include the exact capacitor pin assignments or placement dimensions, so the official datasheet layout—not an inferred drawing—must be used before fabrication.
Do not assume that the 30 V receiver input rating permits unrestricted connector exposure. RS-232 lines can receive surge, ESD, and ESD-clamping events from cables, so use appropriately rated protection and maintain a defined signal-ground connection. Also verify the shutdown truth table: the ADM233LJN keeps its receivers active during shutdown, which may differ from a replacement’s behavior and can materially change system-level power-state expectations.
The ADM233LJN's integrated DC-DC converters remove the external ±12 V requirement, but they do not eliminate power-supply design work. Provide a stable 5 V rail with appropriate bypass capacitance, verify startup current and operating current from the full manufacturer datasheet, and reserve input filtering for noise generated by nearby circuitry. The verified snippets do not provide supply-current limits, capacitor ESR requirements, or power-consumption figures, so those values must be checked before release.
Treat MAX3218EPP and all ADM-family candidates as conditional drop-ins until the pinout and shutdown behavior have been compared line by line. A matching PDIP-20 outline does not by itself prove pin-to-pin compatibility, especially for charge-pump capacitors, shutdown pins, and receiver behavior. Record the manufacturer document used for approval, and do not rely only on distributor parametric matching because the supplied cross-reference snippets omit several electrical fields.
Информация о соответствии
The supplied verified results do not explicitly state compliance for the exact ADM233LJN ordering code. The AEC-Q100 field is unknown rather than not_applicable because the supplied snippets do not explicitly establish that automotive qualification is absent.
