ADM237LJR - 5V 5-Driver 3-Receiver RS-232 | Analog Devices
MPN: ADM237LJR ✓ نشطADM237LJR نظرة عامة
An RS-232 interface transceiver belongs to the communications IC hierarchy and combines digital line-driver and receiver functions with the voltage conversion needed for unbalanced point-to-point serial links. The ADM237LJR is a multichannel variant intended to reduce the number of interface packages required in industrial control, instrumentation, data acquisition, and embedded systems. Its five-driver and three-receiver organization supports asymmetric channel counts where several devices transmit and fewer devices receive data.
Key features include single 5 V operation, compliance with EIA-232-E and V.28 specifications, a maximum data rate of 120 kB/s, onboard DC-DC converters, and a 9 V output swing from a 5 V supply. The advertised 1 µF charge-pump capacitor requirement helps keep the external component count low. Low-power shutdown is supported, while the receivers remain active during shutdown according to the supplied manufacturer and distributor information.
The integrated charge-pump architecture raises the 5 V supply to the bipolar voltage levels required by RS-232 drivers. This architecture eliminates a separate external power supply for positive and negative transceiver rails, although the internal converters, driver output swing, receiver thresholds, and supply noise still require careful PCB treatment. With three receivers receiving up to 30 V input, the receive network must be protected from excessive voltage and ESD exposure.
Typical uses include multi-channel RS-232 test equipment, industrial data-acquisition controllers, serial port expanders, point-of-sale terminals, communications adapters, and embedded control systems. A design with more than three receive endpoints should account for the receiver-count limitation, while a design requiring more than five transmit endpoints needs another transceiver or a different channel configuration.
Place the charge-pump capacitors and interface bypass capacitors close to their specified pins, and route each RS-232 driver and receiver as a separate routed signal rather than through shared buses. Confirm connector-level transient protection and chassis grounding separately from logic-side protection because the ADM237LJR is not a surge-protection device.
This product page consolidates the verified manufacturer description, distributor pricing, channel configuration, package information, interface characteristics, and practical replacement guidance. It also distinguishes a true same-package alternative from related devices that differ in package, channel count, or interface function, preventing a functionally similar part from being presented as an unqualified drop-in replacement.
بدائل مباشرة لـ ADM237LJR — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع ADM237LJR (نفس عامل الشكل والبصمة) — يختلف في Package, Product Type, Number of Drivers, Number of Receivers.
ADM237LARZ
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
ADM237LJR المواصفات
| Product Type | RS-232 driver/receiver transceiver |
| Number of Drivers | 5 |
| Number of Receivers | 3 |
| جهد التغذية | 5 V |
| Operating Supply Range | 4.75 V to 5.25 V |
| Maximum Data Rate | 120 kB/s |
| RS-232 Output Swing | 9 V |
| Charge-Pump Capacitor | 1 µF |
| Receiver Maximum Input Voltage | 30 V |
| Shutdown Feature | Low-power shutdown with receivers active |
| Interface Compliance | EIA-232-E and V.28 |
| العلبة | 24-SOIC |
| Package Width | 7.50 mm |
| نوع التركيب | Surface mount |
دليل تكوين أطراف ADM237LJR 7.50 mm
تكوين الأطراف لـ ADM237LJR (حزمة 7.50 mm). يتم تعريف ترقيم الأطراف والوظائف ومخططات التوصيل في ورقة البيانات الفنية من الشركة المصنعة. راجعها للحصول على البصمة الدقيقة وإرشادات اللحام.
لا تتوفر بيانات مفصلة لمخطط التوصيلات لـ ADM237LJR.
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التطبيقات النموذجية
ADM237LJR مناسب لـ 6 التطبيقs: Industrial Data-Acquisition Controller, Multi-Port Serial Interface Expander, Communications Test Equipment, Point-of-Sale Terminal Interface, Embedded Service and Configuration Interface, Legacy Data-Logging Adapter.
Industrial Data-Acquisition Controller
The ADM237LJR fits an industrial acquisition controller that must connect several instruments through RS-232 while operating from a 5 V logic rail. Five drivers support multiple outbound command or measurement channels, while three receivers can accept status data from three remote devices. The integrated DC-DC converters produce the required bipolar RS-232 levels without a separate positive-and-negative supply. The 120 kB/s rate is suitable for conventional instrumentation links rather than high-speed storage protocols. Place the specified 1 µF charge-pump capacitors and bypass capacitors close to their pins, and verify the operating-temperature grade before industrial deployment.
موصى به
Multi-Port Serial Interface Expander
The ADM237LJR is useful when one embedded controller must expand a limited UART into five RS-232 transmit channels and three receive channels. This arrangement suits legacy equipment, service consoles, and configuration systems in which multiple downstream or upstream nodes use the same RS-232 physical layer. Its 24-SOIC package consolidates several converters and receivers into one IC, but software must arbitrate use of each transmit channel. The 5 V supply simplifies integration with 5 V logic, while the 9 V output swing meets the advertised RS-232 drive requirement. Firmware should avoid simultaneous commands on shared downstream devices and should handle RS-232 direction control around each transaction.
موصى به
Communications Test Equipment
The ADM237LJR can support multi-channel RS-232 test and diagnostic equipment by driving commands to several devices while monitoring responses from three sources. Its 5 V single-supply operation is convenient for portable or benchtop instruments, and the onboard converters avoid distributing additional bipolar rails. The 120 kB/s maximum data rate provides adequate margin for typical RS-232 control and measurement traffic. Test-system designers should still budget connector protection, isolate grounded test fixtures, and verify cable lengths against the applicable RS-232 system design. Receiver inputs support ratings up to 30 V according to the supplied snippets, but that rating is not a substitute for deliberate surge and ESD protection.
موصى به
Point-of-Sale Terminal Interface
The ADM237LJR is applicable to point-of-sale equipment that must connect a controller to multiple peripherals using RS-232, provided the design requires no more than five transmit channels and three receive channels. A single 5 V supply reduces the power architecture, while integrated charge-pump circuitry removes the need for a separate bipolar transceiver supply. The device's 24-SOIC package can be routed on a control board alongside logic and power regulation. Retail terminals should use proper RS-232 grounding, keep cable routing away from noisy motor and switching-power circuits, and add connector-level ESD protection. Firmware must coordinate channel direction and avoid simultaneous driver conflicts when peripherals share command paths.
موصى به
Embedded Service and Configuration Interface
The ADM237LJR is a practical choice for embedded service consoles that expose several legacy configuration ports through one 5 V transceiver package. Five driver outputs can command service modules or target boards, while three receiver inputs can collect status from remote equipment. Its 120 kB/s data rate is more than adequate for configuration menus, diagnostic text, and short command sequences. The asymmetric channel count should be mapped carefully during PCB planning because unused receiver and driver pins still require the package's specified termination and bypass arrangements. Maintain short, controlled-impedance routing for logic-side connections, use appropriate RS-232 cable routing, and do not rely on the integrated converter as electrostatic-discharge protection for exposed connectors.
موصى به
Legacy Data-Logging Adapter
The ADM237LJR can serve as the interface between a modern controller and legacy data-logging equipment that uses RS-232. Five transmit channels can initiate commands or requests to separate instruments, and three receiver channels can collect asynchronous records or status replies. Operating from one 5 V rail simplifies adapter construction, while the integrated DC-DC converters provide the required RS-232 voltage swing. The 120 kB/s rate supports many serial instruments but should be checked against device timing and protocol latency. Designers should validate ground references between connected systems, use shielded cable where appropriate, and add external protection at exposed connectors because the transceiver's 30 V receiver-input rating is an operating limit rather than a complete transient-protection solution.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ ADM237LJR — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | ADM237LARZ |
|---|---|---|
| Package | 24-SOIC | 24-SOIC |
| Brand | Analog Devices | Analog Devices |
| Number of Drivers | 5 | 5 |
| Number of Receivers | 3 | 3 |
| Supply Voltage | 5 V | 5 V |
أبرز الفروقات
- Five transmitters and three receivers in one package (مقابلMAX232DR)
- Single 5 V supply with onboard DC-DC conversion (مقابلMAX237CNG+)
- Surface-mount 24-SOIC construction (مقابلMAX237CNG+)
- High multichannel data-rate capability (مقابلADM237LARZ)
ملاحظات التصميم
Place the 1 µF charge-pump capacitors and the 5 V bypass capacitor close to the pins identified in the official ADM237L Data Sheet Rev. C. Keep the converter-current paths compact and away from sensitive receiver inputs. The verified excerpts specify 1 µF capacitors but do not include their voltage ratings, ESR requirements, or exact reference designators, so those values must be taken directly from the manufacturer document before layout release.
Do not treat the advertised 30 V receiver-input rating as connector-surge protection. Use an appropriately rated TVS device and chassis-ground strategy for exposed RS-232 connectors. Also avoid connecting two active drivers to the same signal net, and confirm whether a peripheral uses RS-232 handshake lines or only data and ground. The supplied five-driver and three-receiver counts must match the intended connector assignment before the PCB is released.
Route each RS-232 driver and receiver as a separate point-to-point interface rather than as a shared bus. Keep connector-side traces away from charge-pump nodes and switching regulators, and provide a clean ground reference for the interface. When connecting equipment with different ground potentials, evaluate whether isolation is required; the ADM237LJR provides RS-232 voltage conversion but does not provide galvanic isolation.
Budget the 5 V rail for both the interface load and the internal charge-pump converters. Place local high-frequency bypass at the supply pins and verify startup behavior with the system power sequence, especially if the transceiver is enabled while external RS-232 drivers are active. The supplied data confirms single 5 V operation and onboard DC-DC converters but does not provide supply-current limits, so use the manufacturer data sheet for final power-budget calculations.
معلومات الامتثال
The verified excerpts do not explicitly state the target part's RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Related comparison pages mention RoHS and REACH for other devices, but those values are not transferred to ADM237LJR.
