ADM488ARZ - 250 kbps Full-Duplex RS-485/422 Transceiver | Analog Devices
料号： ADM488ARZ ✓ 量产中ADM488ARZ 概述
An RS-485 transceiver is an interface IC that combines a differential line driver and differential receiver for balanced digital communication. The RS-485 standard is widely used for robust, multidrop buses in industrial automation, building controls, instrumentation, and communications equipment. ADM488ARZ is also compatible with RS-422 applications, allowing the same device to support point-to-point or multipoint balanced data transmission where the system architecture permits it.
The principal operating features are a 250 kbps maximum data rate, a single 5 V supply with ±10% tolerance, a −7 V to +12 V bus common-mode range, and approximately 12 kΩ input impedance. The slew rate is intentionally reduced to limit electromagnetic interference generated by the transmitter. The device also provides electrostatic-discharge protection of 2 kV EFT according to IEC1000-4-4 and high electromagnetic-immunity capability according to IEC1000-4-3, making it appropriate for electrically noisy environments.
The ADM488ARZ uses a differential driver and receiver architecture to reject common-mode noise while transmitting data over twisted-pair cabling. Its reduced slew rate helps lower radiated emissions, but the maximum supported data rate remains limited to 250 kbps. The approximate 74 µA operating supply current shown in the comparison information supports low-power system designs. In a full-duplex implementation, separate transmit and receive paths are used, requiring separate differential pairs connected to the bus system.
Typical applications include industrial measurement systems, factory automation equipment, building and HVAC controllers, telemetry links, data acquisition units, and isolated or non-isolated RS-485 communication modules. The 8-pin SOIC package supports conventional surface-mount assembly. In an RS-485 interface, the bus should include termination resistors at the physical ends, biasing to prevent an idle bus from floating, and protection appropriate to the installation environment.
When designing around ADM488ARZ, verify the transceiver enable and shutdown states, cable length, topology, grounding strategy, and the voltage limits imposed by connected equipment. The reduced slew rate can improve electromagnetic compatibility but may require attention to bus timing at the highest supported data rate. This page provides the manufacturer product overview, technical specifications, application guidance, comparison information, and practical replacement considerations for faster component selection.
直接替换替代料： ADM488ARZ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ADM488ARZ （相同外形与封装尺寸） ——差异在于 Bus Common-Mode Range, EFT Protection, Mounting Type, Package, Product Type.
ADM488ARZ-REEL7
✅ 直接替换📋 参考替代料（不在目录中）
SN65LBC179P
✅ 直接替换📋 参考替代料（不在目录中）
ISL8488IPZ
✅ 直接替换📋 参考替代料（不在目录中）
ADM488ARZ 规格参数
| Product Type | Full-duplex differential line transceiver |
| Supported Standards | EIA RS-485 and RS-422 |
| Maximum Data Rate | 250 kbps |
| 电源电压 | 5 V ±10% |
| Bus Common-Mode Range | −7 V to +12 V |
| Input Impedance | 12 kΩ |
| Operating Supply Current | 74 µA |
| EFT Protection | 2 kV per IEC1000-4-4 |
| Electromagnetic Immunity | High immunity per IEC1000-4-3 |
| 封装 | 8-pin SOIC |
| 安装类型 | Surface mount |
| 工作温度范围 | −40°C to +85°C |
| Driver Count | 1 driver |
| Receiver Count | 1 receiver |
| Operating Mode | Full duplex |
| Slew Rate | Reduced slew rate for low electromagnetic interference |
ADM488ARZ 8-pin soic 引脚配置指南
ADM488ARZ（8-pin soic 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： ADM488ARZ.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ADM488ARZ 适用于 6 应用s: Industrial Automation Bus, Building and HVAC Control, Data Acquisition and Instrumentation, Telemetry and Remote Monitoring, Factory Motor-Control Systems, Test and Measurement Equipment.
Industrial Automation Bus
The ADM488ARZ fits 250 kbps RS-485 links between PLCs, sensors, actuators, and remote I/O modules. Its differential driver and receiver support balanced multipoint communication, while the reduced slew rate helps limit radiated emissions in cabinet environments. The single 5 V ±10% supply and approximately 74 µA operating current simplify low-power node implementations. Designers should still verify industrial EMC, grounding, surge, and isolation requirements.
推荐
Building and HVAC Control
ADM488ARZ is well suited to balanced control-bus communications in building-management and HVAC systems, where 250 kbps is normally adequate and reduced EMI is useful near motors and switching equipment. The −7 V to +12 V bus common-mode range provides tolerance for ground-potential differences between connected controllers. Termination at the physical bus ends, fail-safe biasing, and careful separation from high-current switching paths remain essential implementation requirements.
推荐
Data Acquisition and Instrumentation
The ADM488ARZ can connect laboratory or industrial data-acquisition equipment to remote sensors through a full-duplex RS-485 link. Differential signaling improves noise immunity, and the 250 kbps rate accommodates many multiplexed measurement channels without imposing the power and EMI cost of a much faster edge rate. The transceiver's 8-pin SOIC format supports compact interface sections, although the system must meet isolation and ground-reference requirements independently of the IC.
推荐
Telemetry and Remote Monitoring
ADM488ARZ supports remote telemetry links where distributed equipment must exchange command and measurement data over balanced copper cabling. The reduced-slew-rate transmitter lowers EMI, while the receiver's differential structure rejects common-mode disturbances encountered between field equipment and the controller. The device is appropriate for links at or below 250 kbps; cable length, topology, isolation, surge exposure, and grounding should be evaluated as part of the complete communication link.
推荐
Factory Motor-Control Systems
The ADM488ARZ can provide the low-speed communications path between motor controllers, condition-monitoring equipment, and factory supervisory systems. Its reduced slew rate is advantageous when the transceiver is routed near motor drive circuits and power converters, because slower edges generally reduce high-frequency emissions. Keep the bus physically separated from switching nodes and route the differential pair as a pair. The transceiver does not replace isolation, surge protection, or functional-safety measures.
推荐
Test and Measurement Equipment
ADM488ARZ can connect bench instruments, production testers, and automated measurement systems to a remote RS-485 controller. At up to 250 kbps, it supports command traffic and periodic measurement results while limiting bus EMI. The device's low operating supply current is useful in compact multi-channel equipment, but the design must provide proper bus termination and fail-safe biasing. Verify the complete timing budget because the reduced slew rate intentionally limits transition speed.
推荐
推荐产品汇总
工程参考数据： ADM488ARZ ——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 | ADM488ARZ-REEL7 | SN65LBC179P | ISL8488IPZ | ADM488AN |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Texas Instruments | Renesas Electronics | Analog Devices |
| Supported Standards | EIA RS-485 and RS-422 | EIA RS-485 and RS-422 | RS-485/RS-422 | RS-485/RS-422 | EIA RS-485 and RS-422 |
关键差异点
- Reduced slew rate supports lower-emission bus operation （对比 SN65LBC179P)
- Specified for balanced RS-485 and RS-422 communication （对比 ISL8488IPZ)
- Low-power 5 V operation in an 8-pin SOIC package （对比 ADM488AN)
设计说明
Route the differential driver and receiver traces as a tightly coupled pair over a continuous ground plane. Keep the pair length balanced, avoid stubs, and maintain clearance from switching nodes and high-current power paths. Place termination components near the physical bus endpoints rather than beside the transceiver unless the topology specifically requires local termination. A full-duplex RS-485 bus normally uses separate driver and receiver pairs, so do not combine those connections without reviewing the system architecture.
The reduced slew rate is intentional and is central to the ADM488ARZ's low-EMI behavior. Do not treat the 250 kbps specification as permission to use a faster transceiver without recalculating cable length, propagation delay, topology, and emissions. Also verify enable and shutdown states before assuming the bus is in fail-safe operation. The verified material does not reproduce the complete pin table, so assign all pins from the current Analog Devices data sheet.
Use a continuous reference plane and return each differential pair through the same physical region. Keep the transceiver away from relay contacts, motor-switching nodes, and high-di/dt power loops. The −7 V to +12 V common-mode range helps tolerate ground offsets, but it does not remove the need for a sound grounding strategy. For long or industrial cables, evaluate external surge and ESD protection and verify that it does not distort the intended receiver threshold or bus loading.
Provide a local 5 V ±10% rail with low impedance and place the required bypass capacitors close to the supply and ground pins according to the manufacturer layout guidance. Decouple shared supply sections locally so switching loads cannot pull the transceiver rail outside its operating range. The approximately 74 µA operating supply current is low, but it does not include every enabled, loaded, or fault-state condition; use the manufacturer electrical-characteristics limits for worst-case power budgeting.
合规信息
The verified material identifies 2 kV EFT protection according to IEC1000-4-4 and high electromagnetic immunity according to IEC1000-4-3. RoHS, REACH, lead-free, halogen-free, and conflict-minerals status were not established by the cited product information.