ADM233LAN - 5V RS-232 Transceiver, 120kB/s | Analog Devices
MPN: ADM233LAN ✓ نشطADM233LAN نظرة عامة
An RS-232 transceiver is an interface IC that combines differential line-driver and receiver functions with the voltage conversion required by the EIA-232 standard. It belongs to the interface IC hierarchy, where an RS-232 transceiver operates between a digital logic circuit and a wired communications port. This is particularly useful when the equipment-side logic supply is 5 V but the RS-232 port requires positive and negative signal voltages.
Key features include operation from one 5 V supply, support for data rates up to 120 kB/s, on-board DC-DC converters, ±9 V output swing, and operation with small 1 µF capacitors. The integrated charge-pump circuitry eliminates the need for a separate external power-supply circuit, reducing board area and simplifying serial-interface implementation.
Technically, the ADM233LAN is a 2/2 full RS-232 transceiver: two transmitter channels and two receiver channels are provided in one package. Its on-board converters generate the bipolar voltage levels required by RS-232 while the device interfaces with conventional 5 V CMOS logic. This integration is valuable in compact industrial, instrumentation, and embedded systems where component count and PCB area are constrained.
Typical uses include RS-232 test equipment, data-acquisition systems, industrial control links, service interfaces, and legacy peripheral connections. In these applications, the device can translate 5 V TTL or CMOS UART signals to and from the bipolar RS-232 interface. Designers should still include appropriate line protection and verify signal-integrity requirements in long or electrically noisy installations.
A primary design consideration is charge-pump capacitor selection and placement. The manufacturer documentation specifically highlights small 1 µF capacitors, and these components should be placed close to the associated device pins to minimize loop area and preserve stable converter operation. Decoupling, grounding, and protection requirements should be implemented according to the manufacturer datasheet.
This page consolidates the verified manufacturer and distributor information with a pin-compatible family alternative, parameter comparison, application guidance, and practical interface-design notes. It distinguishes documented electrical facts from parameters that require confirmation in the current manufacturer datasheet or distributor inventory record.
بدائل مباشرة لـ ADM233LAN — 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 ADM233LAN (نفس عامل الشكل والبصمة).
ADM233LJNZ
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
ADM233LAN المواصفات
| لا تتوفر مواصفات |
دليل تكوين أطراف ADM233LAN standard
تكوين الأطراف لـ ADM233LAN (حزمة standard). 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 ADM233LAN.
راجع ورقة البيانات للحصول على تكوين الأطراف الكامل.
التطبيقات النموذجية
ADM233LAN مناسب لـ 6 التطبيقs: RS-232 Test and Measurement Equipment, Industrial Control and Automation Links, Data Acquisition and Instrumentation, Embedded System Service Interfaces, Legacy Peripheral Connectivity, Serial Port Communication and Diagnostics.
RS-232 Test and Measurement Equipment
The ADM233LAN fits legacy test instruments and laboratory interfaces that use a 5 V logic rail but require an EIA-232-E or V.28 port. Its two transmitters and two receivers can support bidirectional command and data paths, while the integrated DC-DC converters generate approximately ±9 V swing without a separate negative supply. The 120 kB/s rate is appropriate for instrument-control traffic that is not continuously transferring large files. Using the 20-pin PDIP package also suits equipment platforms designed around through-hole assembly. Designers should follow the Analog Devices datasheet for charge-pump capacitor selection, layout, and external protection.
موصى به
Industrial Control and Automation Links
The ADM233LAN is appropriate for controller boards and industrial service ports that rely on RS-232 rather than differential Ethernet or RS-485. A single 5 V supply can feed the interface while the integrated converters produce the bipolar voltage required by connected equipment, simplifying low- and medium-speed control links. Two transmitters and two receivers provide flexible point-to-point channel allocation. Before deployment, verify the exact temperature rating and lifecycle status because those suffix-specific limits are not quantified in the supplied excerpts. Robust deployments should also include cable transient protection and a clear chassis-ground strategy.
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Data Acquisition and Instrumentation
The ADM233LAN can connect 5 V data-acquisition equipment to a legacy RS-232 host when two channels and a 120 kB/s maximum rate meet the measurement-control requirement. Its integrated DC-DC converters avoid adding a separate negative supply near the connector, which is useful in compact instrumentation. The receiver channels can return acknowledgements or status data while the transmitter channels carry commands or sampled results. For laboratory use, engineers should still control cable length, provide common-mode grounding, and protect the connector against electrostatic discharge. The manufacturer datasheet remains the controlling source for charge-pump layout and decoupling.
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Embedded System Service Interfaces
The ADM233LAN is useful for embedded equipment that retains a service or configuration port using RS-232. Its 5 V-only architecture suits logic systems that already operate from 5 V, and the two transmitters and two receivers can support separate diagnostic channels. The 20-pin PDIP package favors industrial embedded products assembled with through-hole components, although no SOIC variant should be assumed compatible without checking its pinout. In deployed equipment, firmware must configure the UART baud rate and parity correctly, while the hardware should include limiting resistors or protection devices recommended by the manufacturer.
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Legacy Peripheral Connectivity
The ADM233LAN provides a practical bridge between modern 5 V control logic and legacy peripherals that use only an RS-232 port. Examples include printers, scanners, programmers, and service adapters whose interfaces operate below the device's 120 kB/s ceiling. The integrated converters and compact component requirement simplify retrofit boards compared with discrete driver designs. Compatibility still requires matching voltage levels, baud rate, data bits, parity, and connector pin assignment. Engineers should avoid assuming that a mechanically similar DB9 port has the same signal-to-ground mapping, and they should verify the receiver's logic-level output against the host UART.
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Serial Port Communication and Diagnostics
The ADM233LAN can serve as the physical RS-232 layer in a diagnostic channel that reports boot status, configuration results, or field-service commands. Two transmitters and two receivers allow separate command and telemetry paths if the host supports them, while the 5 V supply simplifies integration with older embedded platforms. The 120 kB/s maximum data rate is more than sufficient for status and control messages. For dependable field operation, designers should include ESD protection at the connector, maintain a low-resistance ground path, and follow the manufacturer layout guidance to keep switching-converter currents away from sensitive analog circuitry.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ ADM233LAN — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | ADM233LJNZ |
|---|---|---|
| Brand | Analog Devices | Analog Devices |
| Package | 20-PDIP | 20-PDIP - same package |
| Interface Type | RS-232 transceiver | RS-232 transceiver |
| Transmitters | 2 | 2 |
| Receivers | 2 | 2 |
| Supply Voltage | 5 V | 5 V |
| Maximum Data Rate | 120 kB/s | 120 kB/s |
| Integrated DC-DC Converters | Yes | Yes |
| Standards | EIA-232-E and V.28 | EIA-232-E and V.28 |
أبرز الفروقات
- Single-supply bipolar interface implementation (مقابلADM233LJNZ)
- Matched full-duplex channel configuration (مقابلADM233LJNZ)
- PCB footprint compatibility (مقابلADM233LJNZ)
ملاحظات التصميم
Use a single 5 V supply and confirm that its voltage, current capability, ripple, and sequencing meet the ADM233L family requirements. The device uses on-board DC-DC converters to obtain the bipolar RS-232 voltage swing, so the input rail still requires careful decoupling. Place the manufacturer's specified charge-pump and bypass capacitors close to their associated pins, and route converter return current away from sensitive receiver and grounding paths.
Keep the charge-pump loop compact and connect its return directly to the device ground plane as directed by the Analog Devices documentation. Avoid routing switching current between the IC ground pins or beneath the receiver section. A short, low-inductance path helps preserve converter stability and reduces the chance that transient switching activity will disturb a UART signal. Use the official ADM233L datasheet for the authoritative capacitor placement and pin configuration.
Do not treat every RS-232 transceiver as a drop-in replacement merely because it has the same channel count. The ADM233LAN uses a 20-PDIP package, while several common RS-232 devices use 16-pin SOIC packages. Confirm the PCB footprint, every power and ground connection, driver and receiver pin mapping, UART logic levels, and capacitor requirements before substitution. Also verify that the DB9 connector mapping matches the attached equipment.
Install suitable transient and ESD protection at an exposed RS-232 connector, especially for equipment connected to external cables. Protection components should be selected so that they do not distort the receiver threshold or unnecessarily load the driver outputs. Keep the protected connector path physically separated from sensitive analog circuitry, and use a deliberate chassis and signal-ground strategy to limit common-mode transients.
معلومات الامتثال
The supplied excerpts do not contain a definitive manufacturer compliance declaration for the ADM233LAN. A reseller claim of RoHS non-compliance was not treated as authoritative because it conflicts with the absence of a corresponding manufacturer statement.
