ADM231LAQ - 5V CMOS RS-232 Transceiver | Analog Devices
料号： ADM231LAQ ✓ 量产中ADM231LAQ 概述
A CMOS RS-232 interface transceiver is a signal-line interface integrated circuit that combines a line driver and receiver with the voltage conversion required by RS-232. Within the broader hierarchy of interface ICs, it translates low-voltage CMOS logic into RS-232-level signals and converts received RS-232 levels back into CMOS-compatible signals. Its applications include data acquisition, industrial control, test equipment, and equipment-to-equipment communication links.
The ADM231LAQ supports a data rate of 120 kB/s and provides a 9 V output swing from a 5 V supply. Its on-board DC-DC converters eliminate the need for a separate boosted supply for the RS-232 driver. Small 1 µF charge-pump capacitors are specified for the converter implementation, reducing board area compared with traditional discrete charge-pump approaches.
A low-power shutdown feature helps reduce supply consumption when the interface is not active. Unlike the standard shutdown arrangement in some competing transceivers, the ADM231LAQ keeps its receivers active during shutdown, allowing incoming RS-232 signals to remain detectable. Its receiver input can also tolerate signals as high as 30 V, which improves robustness when the connected cable or system exposes the interface to larger voltage excursions.
The ADM231LAQ is suitable for point-to-point RS-232 links in industrial equipment, instrumentation, data loggers, and control systems. A single 5 V rail simplifies system power architecture, while the integrated converters maintain the positive and negative voltages required by RS-232. The 120 kB/s rate supports legacy serial communication, modem interfaces, and equipment control links where higher-speed differential standards are unnecessary.
The principal design consideration is ensuring that external protection, connector selection, and grounding match the cable environment. The 30 V receiver input capability improves tolerance, but it does not replace surge protection or isolation in long industrial cable runs. Designers should also verify the exact package dimensions and pin assignment before PCB layout because the verified data identifies the device as a 16-pin part without publishing the package drawing in the supplied excerpts.
This page consolidates the verified 120 kB/s operating rate, 5 V supply, 9 V output swing, 1 µF capacitor requirement, shutdown behavior, and distributor pricing information. It also separates confirmed data from unavailable package, pinout, lifecycle, and drop-in replacement details so engineers can identify what must be checked against the manufacturer datasheet before production release.
直接替换替代料： ADM231LAQ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
该产品暂无直接替换替代料。
请求替代料ADM231LAQ 规格参数
| Product Type | +5 V powered CMOS RS-232 driver/receiver |
| 电源电压 | 5 V |
| 数据速率 | 120 kB/s |
| RS-232 Output Swing | 9 V |
| Charge-Pump Capacitor Value | 1 µF |
| Receiver Input Voltage Maximum | 30 V |
| Shutdown Feature | Low-power shutdown |
| Receiver Operation During Shutdown | Receivers remain active |
| RS-232 Compliance | EIA-232-E and V.28 |
| On-Board DC-DC Converter | Yes |
| Logic Family | CMOS |
| Package Pin Count | 16 pins |
ADM231LAQ 16 pins 引脚配置指南
ADM231LAQ（16 pins 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： ADM231LAQ.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ADM231LAQ 适用于 6 应用s: Industrial Equipment Serial Interface, Data Acquisition and Instrumentation, Point-to-Point Equipment Communication, Low-Power Shutdown Interface, Test and Measurement Systems, Embedded Controller Serial Port.
Industrial Equipment Serial Interface
The ADM231LAQ fits industrial equipment that uses a legacy RS-232 point-to-point link and has only a 5 V rail available. Its single 5 V operation removes the need for a separate negative supply, while the integrated DC-DC converters generate the voltage required for the stated 9 V RS-232 output swing. The 120 kB/s rate is appropriate for configuration transfers, status reporting, and supervisory commands rather than high-throughput data streaming. Use the 30 V receiver input rating as additional robustness, not as a substitute for surge protection, particularly when the interface reaches external equipment through long cables.
推荐
Data Acquisition and Instrumentation
The ADM231LAQ is suitable for laboratory and industrial data-acquisition equipment that exposes a conventional RS-232 configuration or command port. A 120 kB/s link is sufficient for sending measurement records, setup parameters, and diagnostic results, while the 5 V-only supply requirement simplifies instrumentation built around modern mixed-signal systems. The on-board DC-DC converters and specified 1 µF capacitors keep the external power arrangement compact. Engineers should still account for cable length, ground reference, and electrostatic-discharge exposure at the connector.
推荐
Point-to-Point Equipment Communication
The ADM231LAQ can connect two pieces of equipment over a point-to-point RS-232 link when both ends support compatible logic and signaling levels. Its 120 kB/s maximum data rate covers many legacy control and monitoring protocols, while the 9 V output swing provides the required bipolar RS-232 driver voltage from a single 5 V supply. The integrated converter architecture avoids a separate external boost circuit. Communication reliability still depends on correct grounding, connector pin assignment, cable shielding, and firmware settings that match the supported baud rate and framing format.
推荐
Low-Power Shutdown Interface
The ADM231LAQ is useful when an equipment interface must reduce local power consumption without completely losing the ability to detect incoming RS-232 signals. Its low-power shutdown feature places the interface into a reduced-power state, but the receivers remain active according to the verified datasheet listing. This allows a host or controller to monitor a connected device while the transmitter-side activity is minimized. The exact shutdown supply current and logic thresholds are not included in the supplied data and must be confirmed from the manufacturer datasheet before making a power-budget commitment.
推荐
Test and Measurement Systems
The ADM231LAQ can serve as the RS-232 command interface in test and measurement systems where instruments expose a serial control port. The 120 kB/s rate is appropriate for sending commands and retrieving limited measurement results, and the single 5 V supply simplifies portable or embedded test equipment. The stated 30 V receiver input capability can improve tolerance to voltage excursions in poorly controlled installations. For professional instrumentation, add suitable connector-level protection and verify common-mode and ground relationships between the host and the device under test.
推荐
Embedded Controller Serial Port
The ADM231LAQ can add a standards-based RS-232 port to an embedded controller that uses CMOS logic but must communicate with legacy equipment. Its 120 kB/s maximum rate supports common embedded serial protocols, and operating from 5 V avoids requiring a dedicated negative RS-232 rail. The on-board converters and 1 µF capacitors also simplify the analog support network around the transceiver. Because the verified record does not include the full pinout, channel arrangement, or logic thresholds, the complete manufacturer datasheet must be reviewed before assigning UART signals and shutdown-control pins.
推荐
推荐产品汇总
工程参考数据： ADM231LAQ ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 |
|---|---|
| Product Type | +5 V powered CMOS RS-232 driver/receiver |
| Brand | Analog Devices |
| Package | 16-pin package; exact package type not supplied |
| Supply Voltage | 5 V |
| Maximum Data Rate | 120 kB/s |
| RS-232 Output Swing | 9 V |
| On-Board DC-DC Converters | Yes |
| Charge-Pump Capacitor Value | 1 µF |
| Shutdown Receiver Behavior | Receivers active during shutdown |
| Receiver Input Maximum | 30 V |
| RS-232 Standards | EIA-232-E and V.28 |
| Advertised Price | $5.2367 as of 2026-10-29 |
关键差异点
- Single-supply RS-232 interface （对比 MAX232DR)
- Receivers remain active during shutdown （对比 MAX202IDR)
- 9 V output swing from a 5 V rail （对比 MAX232DR)
设计说明
Budget the ADM231LAQ as a single +5 V interface device because the verified datasheet listing identifies on-board DC-DC converters and a 9 V RS-232 output swing from that supply. Place the specified 1 µF charge-pump capacitors close to their associated pins and follow the manufacturer layout and capacitor-tolerance requirements. Do not add an external negative RS-232 supply on the assumption that the on-board converter architecture requires one.
The 30 V receiver input rating is not equivalent to an industrial surge-protection rating. For cable-connected equipment, evaluate connector-level ESD, EFT, and surge protection according to the installation environment. Verify the exact package pinout before connecting UART, enable, ground, and charge-pump capacitor nodes because the supplied excerpts identify a 16-pin device without reproducing its individual pin assignments.
Keep the ADM231LAQ and its 1 µF charge-pump capacitors close together to minimize loop area and switching-node exposure. Provide a low-impedance ground return for the transceiver and connector, route the RS-232 traces away from sensitive analog or high-speed digital paths where practical, and maintain the datasheet's recommended component placement. Cable-side protection should connect at the connector rather than far downstream on the board.
合规信息
The supplied verified excerpts do not state RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification status. AEC-Q100 is marked not applicable because no automotive qualification claim appears in the verified data.