ADM208ARS - 4/4 RS-232 200kbps IC | Analog Devices
MPN： ADM208ARS ✓ 啟用中ADM208ARS 概覽
An RS-232 transceiver is an interface IC that converts logic-level digital signals into RS-232 line levels and converts received RS-232 signals back into CMOS-compatible logic. Within the signal-chain hierarchy, the ADM208ARS is a multi-channel line transceiver, placing it between low-voltage digital controllers and external RS-232 equipment such as computers, peripherals, modems, printers, and instruments.
The four-driver, four-receiver arrangement provides eight independently usable RS-232 channels in one package. Key operating characteristics include a maximum data rate of 200 kbps, low power consumption of 15 mW as stated in the verified feature summary, and external charge-pump capacitors of 0.1 µF. The ADM208 family also provides 9 V output swing with a +5 V supply and receiver input levels rated to 30 V.
The +5 V single-supply architecture simplifies power planning in systems that already operate from 5 V. Internally generated charge-pump voltage raises the driver output above the normal supply rail, allowing the device to meet RS-232 output voltage requirements without a separate negative supply. The ADM208 data sheet also identifies the family as a plug-in upgrade for MAX205, MAX211, and MAX213 devices, providing a useful basis for compatibility assessment when evaluating board revisions.
Typical applications include multi-channel data acquisition, industrial instrumentation, printer and modem interfaces, computer peripherals, and embedded serial-port systems. Four transmitter and four receiver channels also allow one controller to communicate with several RS-232 devices or support bidirectional links on fewer physical lines.
The principal design consideration is ensuring adequate charge-pump capacitor selection and placement. The verified data identifies 0.1 µF capacitors, so designers should follow the manufacturer’s recommended capacitor type, voltage rating, and PCB layout to obtain the specified 200 kbps operation and dependable line-driver behavior.
直接替換替代品，適用於 ADM208ARS — 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。
MAX208IDBRG4
✅ 直接替換📋 參考替代品（不在目錄中）
ADM208ARS 規格
| Product Type | RS-232 transceiver |
| 供應電壓 | +5 V |
| Driver Channels | 4 |
| Receiver Channels | 4 |
| Maximum Data Rate | 200 kbps |
| Charge-Pump Capacitor Value | 0.1 µF |
| RS-232 Output Swing | 9 V with +5 V supply |
| Low Power Consumption | 15 mW |
| Receiver Input Voltage Rating | 30 V |
| Technology | CMOS |
| Product Lifecycle | Production |
| Data Sheet Revision | Rev. D |
| 封裝 | SSOP |
| 安裝類型 | Surface Mount |
| Application Equipment | Computers, peripherals, modems, printers, instruments |
ADM208ARS ssop 腳位配置指南
ADM208ARS（ssop 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： ADM208ARS.
請參閱 資料表 以查看完整腳位配置。
典型應用
ADM208ARS 適用於 6 應用s: Industrial Data Acquisition, Printer and Modem Interface, Computer Peripheral Communication, Test and Measurement Equipment, Embedded Serial Port Controller, Multi-Channel Communication Backplane.
Industrial Data Acquisition
The ADM208ARS fits multi-channel industrial data-acquisition equipment that must connect legacy RS-232 instruments to a controller. Its four drivers and four receivers support several links while the verified 200 kbps rate accommodates many instrument-control protocols. The +5 V architecture simplifies integration with systems that already operate from 5 V, and the 30 V receiver input rating provides tolerance for externally connected equipment. Designers should isolate common grounds appropriately, control RS-232 cable transients, and follow the Analog Devices charge-pump layout using the specified 0.1 µF capacitors.
推薦
Printer and Modem Interface
The ADM208ARS is suitable for printer, modem, and peripheral interfaces that require multiple RS-232 channels from a +5 V supply. Four transmitter channels can support outbound control or status signals, while four receiver channels can collect acknowledgments, data, and fault information. The 200 kbps maximum data rate matches conventional asynchronous RS-232 links, and the single +5 V operating rail avoids requiring a separate negative supply. For reliable deployment, use the specified 0.1 µF charge-pump capacitors and verify the driver and receiver pin mapping against the manufacturer data sheet before PCB release.
推薦
Computer Peripheral Communication
The ADM208ARS can support legacy computer peripheral communication where multiple RS-232 ports are consolidated on one interface IC. Four driver and four receiver channels provide flexibility for bidirectional ports, status handshakes, and auxiliary control lines. Its 200 kbps rating is suitable for traditional serial peripherals, while the +5 V supply and 9 V output swing reduce the external power requirement compared with older RS-232 implementations. Engineers should confirm logic levels, handshake timing, connector protection, and cable grounding because those system-level issues are not defined by the transceiver data rate.
推薦
Test and Measurement Equipment
The ADM208ARS is appropriate for test and measurement instruments that expose RS-232 command or result ports. Four transmitters and four receivers allow one instrument controller to present multiple interfaces, reducing the need for separate single-channel transceivers. The verified 200 kbps maximum rate supports many legacy instrument protocols, and the 30 V receiver input rating is useful in equipment where the attached port can see external voltage excursions. The design should include adequate input protection, defined signal grounding, and manufacturer-compliant charge-pump capacitor placement to preserve reliable high-speed operation.
推薦
Embedded Serial Port Controller
The ADM208ARS fits embedded control boards that must bridge CMOS logic to one or more RS-232 ports. A microcontroller can use individual driver and receiver channels for command output, status input, or full-duplex communication, while the 200 kbps ceiling covers many legacy UART configurations. Operating from +5 V is convenient for systems that also use 5 V digital logic, and the internally generated elevated driver voltage avoids a negative rail. Firmware and hardware designers should account for RS-232 polarity, grounding, unused-channel handling, and the manufacturer-specified 0.1 µF charge-pump capacitors.
推薦
Multi-Channel Communication Backplane
The ADM208ARS can be used in communication backplanes and terminal interfaces where several point-to-point RS-232 paths must be implemented. Its eight-channel 4/4 organization supports transmit and receive routing across separate links, while the CMOS implementation is appropriate for digital control logic operating from +5 V. The 200 kbps rate is intended for legacy RS-232 equipment rather than modern high-speed serial protocols. Backplane designers should maintain return paths, separate noisy outputs from sensitive inputs, and validate every unsupported channel according to the Analog Devices data sheet and recommended application circuit.
推薦
推薦產品摘要
工程參考資料，適用於 ADM208ARS — 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 | MAX208IDBRG4 |
|---|---|---|
| Brand | Analog Devices | Texas Instruments |
| Package | SSOP | SSOP-20 |
| Product Type | 4/4 RS-232 transceiver | RS-232 transceiver candidate |
| Driver Channels | 4 | 4 |
| Receiver Channels | 4 | 4 |
主要差異化特點
- Four transmitters and four receivers integrated in one interface IC (對比MAX208IDBRG4)
- Single +5 V operating supply with elevated RS-232 output (對比MAX208IDBRG4)
- Low external charge-pump capacitance (對比MAX208IDBRG4)
- Production status confirmed by the manufacturer (對比MAX208IDBRG4)
設計說明
Place the specified 0.1 µF charge-pump capacitors close to the ADM208ARS pins and follow the Analog Devices ADM208 recommended layout. Trace length and grounding of the charge-pump network can affect driver behavior, especially when operating near the supported 200 kbps maximum rate. Keep the interface connector and driver outputs away from sensitive analog or high-speed digital paths to reduce the chance of charge-pump and output-transition coupling into the host board.
Do not treat every +5 V RS-232 transceiver as automatically interchangeable with the ADM208ARS. Before using MAX208IDBRG4 as a replacement, verify the exact SSOP footprint, pin numbering, exposed functions, charge-pump capacitor value, enable or shutdown behavior, and supply requirements against both manufacturers’ data sheets. The verified sources identify MAX208IDBRG4 as a direct comparison candidate, but they do not include a complete pin-by-pin substitution table.
RS-232 is a single-ended, unbalanced interface, so cable routing and grounding are as important as the IC selection. Keep each driver-to-receiver return path continuous, use the connector shield appropriately, and avoid sharing narrow ground returns with switching power or high-current actuator wiring. The verified 30 V receiver input rating should not be treated as a substitute for external surge or ESD protection in industrial environments.
The ADM208ARS uses a +5 V supply and is described as a 15 mW low-power device, simplifying integration with 5 V control systems. Nevertheless, calculate the total supply demand from the transceiver, charge-pump capacitors, level shifters, and attached interface circuitry rather than relying on the device’s headline power figure alone. Use local decoupling and verify the capacitor voltage ratings against the charge-pump voltages generated internally.
合規資訊
The verified web data does not provide explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations for ADM208ARS. No compliance status has been assumed.
