ADM208ARZ - 4/4 RS-232 Transceiver, 5V, 24-SOIC | Analog Devices
MPN： ADM208ARZ ✓ 啟用中ADM208ARZ 概覽
An RS-232 transceiver is an interface IC that combines voltage-level drivers and receivers for serial data links. In the signal-path hierarchy, the ADM208ARZ is an RS-232 transceiver, also called a line-driver/receiver IC, within the broader interface-IC and semiconductor categories. Its integrated charge-pump converters allow a single-ended 5 V system supply to communicate with conventional ±12 V RS-232 equipment without external power rails.
The ADM208ARZ integrates four RS-232 drivers and four receivers in one package. The manufacturer specifies 200 kB/s operation, low power consumption of 15 mW, and an output swing of approximately ±9 V from a 5 V supply. Charge-pump capacitors may range from 0.1 µF to 10 µF, while receiver inputs tolerate voltages to ±30 V, improving robustness against accidental RS-232-level voltage exposure. These characteristics make the device suitable for multi-channel industrial control, data acquisition, test equipment, and legacy peripheral connections.
The internal architecture uses charge-pump circuitry to develop the negative voltage required by the RS-232 drivers. Four transmit channels independently convert TTL or CMOS logic levels into bipolar RS-232 signals, while four receive channels convert bipolar RS-232 inputs into TTL-compatible logic. The device supports the MAX206 through MAX211 and MAX213 families' pin-compatible interface arrangements, which can simplify qualification of equivalent interface hardware when the electrical ratings remain acceptable for the target design.
Typical applications include four-wire RS-232 links between industrial controllers and instrumentation, laboratory test systems, point-of-sale equipment, printers, and legacy computers. Because four driver and receiver channels are combined in one device, it can reduce component count and board area in multi-port systems. The 5 V supply architecture also avoids generating ±12 V externally in equipment where the enclosure and power budget are constrained.
Design attention should be paid to charge-pump capacitor selection, ground integrity, and the separation between sensitive receive paths and high-energy driver outputs. Place the required capacitors close to their associated pins, use a low-impedance ground plane, and route the receive and transmit nets to avoid parallel runs that could couple edge noise into receiver inputs. Confirm the selected capacitor voltage rating and ESR behavior against the device's recommended operating conditions.
This product page combines the manufacturer's interface specifications with practical pin, replacement, and layout guidance. It also distinguishes true 24-pin drop-in alternatives from devices with different channel counts or package footprints, helping engineers evaluate board reuse without assuming that every RS-232 transceiver is electrically or mechanically interchangeable.
直接替換替代品，適用於 ADM208ARZ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ADM208ARZ （相同外形與佔位） — 差異在於 Maximum Data Rate, Package, Driver Output Swing, Interface Standard, Number of Receivers.
MAX211IDWR
✅ 直接替換聯絡詢價
查看資料表 →MAX211CDWR
✅ 直接替換聯絡詢價
查看資料表 →MAX208CPE
✅ 直接替換📋 參考替代品（不在目錄中）
MAX209CPE
✅ 直接替換📋 參考替代品（不在目錄中）
MAX210CPE
✅ 直接替換📋 參考替代品（不在目錄中）
ADM208ARZ 規格
| Product Type | RS-232 transceiver |
| Number of Drivers | 4 |
| Number of Receivers | 4 |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Nominal Supply Voltage | 5 V |
| Maximum Data Rate | 200 kB/s |
| Driver Output Swing | Approximately ±9 V |
| Power Consumption | 15 mW |
| Charge-Pump Capacitor Range | 0.1 µF to 10 µF |
| Receiver Input Voltage Tolerance | ±30 V |
| Interface Standard | EIA-232-E and V.28 |
| 封裝 | 24-pin SOIC |
| Package Width | 7.50 mm |
| Packaging | Tube |
| Lead-Free Status | Lead-free |
ADM208ARZ 7.50 mm 腳位配置指南
ADM208ARZ（7.50 mm 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： ADM208ARZ.
請參閱 資料表 以查看完整腳位配置。
典型應用
ADM208ARZ 適用於 6 應用s: Industrial Controller RS-232 Expansion, Laboratory Test and Measurement Systems, Data Acquisition and Control, Point-of-Sale and Retail Equipment, Legacy Computer and Peripheral Connectivity, Networked Security and Access Equipment.
Industrial Controller RS-232 Expansion
The ADM208ARZ is suitable for industrial controllers that need several RS-232 ports without supplying external ±12 V rails. Four drivers and four receivers provide a 4/4 interface arrangement from one 5 V supply, while approximately ±9 V output swing supports conventional RS-232 signaling. Its 200 kB/s maximum rate is suitable for configuration links, operator panels, barcode readers, and service equipment. The 24-pin SOIC also allows a controlled transition from a single-channel interface to four channels without changing the supply architecture.
推薦
Laboratory Test and Measurement Systems
Laboratory instruments often combine a legacy RS-232 port with newer USB- or Ethernet-based control paths. The ADM208ARZ provides four RS-232 channels for instrument triggering, remote commands, and diagnostic communication while operating from a 5 V rail. Its four receivers reduce the number of interface packages needed for multi-instrument control, and receiver input tolerance to ±30 V adds margin against transients on connected cables. Designers should still add appropriate protection for exposed external connectors and verify the complete test-bench grounding scheme.
推薦
Data Acquisition and Control
The ADM208ARZ fits multi-channel data-acquisition front ends that must aggregate commands from several RS-232 instruments. Four transmit channels can address separate devices, while four receive channels collect acknowledgments and measurements without requiring a separate transceiver for every link. Operation from a single 5 V supply simplifies system power design, and the 200 kB/s rate is sufficient for many short control and monitoring links. Charge-pump components should be positioned near the IC, and receive routes should be kept away from fast output transitions to minimize coupling.
推薦
Point-of-Sale and Retail Equipment
Retail terminals commonly retain RS-232 connections for scanners, printers, scales, and customer displays. The ADM208ARZ can consolidate several of these legacy ports into one 24-pin SOIC while accepting a convenient 5 V supply. Four full-duplex channels reduce package count, and the approximately ±9 V driver swing is appropriate for standard RS-232 links. In compact equipment, maintain adequate separation between the transceiver and display or switching-supply circuitry, and verify connector-level ESD protection independently from the receiver's ±30 V input tolerance.
推薦
Legacy Computer and Peripheral Connectivity
The ADM208ARZ provides a practical bridge between modern TTL or CMOS logic and legacy RS-232 equipment such as printers, scanners, and service ports. Its integrated charge pumps generate the required negative driver voltage from a 5 V rail, eliminating a separate ±12 V supply in many embedded systems. Four channels permit simultaneous control and status paths, while the 24-pin SOIC simplifies board-level integration. Firmware should account for the device's maximum 200 kB/s rate and use appropriate cable lengths and grounding for reliable communication with older equipment.
推薦
Networked Security and Access Equipment
Access-control and security equipment may retain RS-232 for local configuration, diagnostics, or connections to legacy sensors while using Ethernet or another network interface for primary communications. The ADM208ARZ's four-channel 4/4 arrangement can service multiple local links from a single 5 V supply, reducing interface-component count in space-constrained enclosures. Its receiver tolerance to ±30 V is useful in industrial cabinets, although dedicated surge and ESD protection may still be required at externally accessible connectors. Maintain a quiet ground reference and isolate external cables where installation conditions warrant it.
推薦
推薦產品摘要
工程參考資料，適用於 ADM208ARZ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MAX211IDWR | MAX211CDWR | MAX208CPE | MAX209CPE | MAX210CPE |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 24-SOIC | 24-SOIC | 24-SOIC | 24-SOIC | 24-SOIC | 24-SOIC |
| Interface | RS-232 | RS-232 | RS-232 | RS-232 | RS-232 | RS-232 |
主要差異化特點
- Single-supply 4/4 interface with 200 kB/s operation (對比MAX208CPE)
- Low 15 mW operating-power specification (對比MAX211IDWR)
- Four-channel integration without external ±12 V rails (對比MAX202IDWR)
設計說明
Place the ADM208ARZ charge-pump capacitors close to the pins specified by the manufacturer application diagram. Keep the associated traces short, use a continuous ground reference beneath the interface section, and provide a low-impedance path from the device ground to the system return. Incorrect capacitor placement can increase charge-pump ripple and reduce effective noise performance even when the nominal capacitor values are correct.
Route the four receiver inputs away from the four RS-232 driver outputs and from high-current switching nodes. Avoid long, parallel receive and transmit traces, because shared edge-related coupling can corrupt weak receiver signals. Connect each interface ground reference close to the IC rather than routing driver return current through the sensitive receive area. For externally accessible connectors, add connector-specific ESD and surge protection where required.
Do not treat the ±30 V receiver input tolerance as permission to omit external connector protection. It describes the receiver's stated input range, not an unlimited surge rating. Also avoid assuming that every 24-pin SOIC RS-232 transceiver is interchangeable: check shutdown pins, supply thresholds, driver levels, data rate, charge-pump capacitor requirements, and input impedance before replacing the ADM208ARZ with a MAX206-MAX211 or MAX213 family device.
合規資訊
The component listing identifies the ADM208ARZ as lead-free. RoHS, REACH, halogen-free, and conflict-minerals status were not stated in the manufacturer excerpts.