ADM211AR - 4/5 RS-232 Transceiver, 120 kbps | Analog Devices
MPN: ADM211AR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.76 | $1.76 |
| 10 | $1.76 | $17.60 |
| 100 | $1.76 | $176.00 |
| 500 | $1.76 | $880.00 |
| 1,000 | $1.76 | $1,760.00 |
ADM211AR Overview
An RS-232 transceiver is an interface IC that converts between digital logic levels and the bipolar voltage levels used by RS-232 links. It belongs to the broader line-driver/receiver and interface-IC hierarchy, where differential or single-ended digital signals must cross systems with different voltage references. The ADM211AR combines four transmit channels and five receive channels for multi-port equipment, industrial controllers, and legacy peripheral connections.
Key features include four drivers, five receivers, operation from a 4.5 V to 5.5 V supply, and a data rate of 120 kB/s. The on-board dc-to-dc converters support approximately ±9 V output swing from a 5 V supply, while the low-power mode is specified at 15 mW. The receiver section provides 30 V input-level handling according to the supplied search data, making the device useful where protected or long RS-232 lines are encountered.
The ADM211AR is designed for EIA-232-E and V.28 interfaces when ±12 V is unavailable. Its 28-SOIC package provides a conventional surface-mount footprint and allows the four transmitters and five receivers to be consolidated instead of using separate interface devices. The exact pin assignments, absolute maximum ratings, propagation timing, and detailed electrical limits must be confirmed in the manufacturer datasheet before layout or production use.
Typical applications include RS-232 port expansion, industrial data acquisition, test equipment, instrumentation, and embedded serial interfaces. In a multi-port design, the four drivers can support outgoing connections while five receivers provide additional inbound channels. The shared supply architecture also simplifies system design where a single 5 V rail is available.
A key design consideration is maintaining the correct charge-pump capacitor values and checking the RS-232 line polarity and signal levels during bring-up. Decoupling should follow the manufacturer application guidance, and unused channels should be configured according to the datasheet rather than left floating. The device is a digital interface IC, so SOA is not applicable.
This product page consolidates verified manufacturer and distributor information, application guidance, sourcing context, and engineering design notes. It distinguishes verified facts from parameters that still require the complete manufacturer datasheet, helping engineers evaluate the ADM211AR without relying on unverified substitutions.
Drop-in alternatives for ADM211AR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADM211ARZ
✅ Drop-In📋 Reference alternative (not in catalog)
ADM211AR-REEL
✅ Drop-In📋 Reference alternative (not in catalog)
ADM211AR Specifications
| Product Type | RS-232 transceiver |
| Number of Drivers | 4 |
| Number of Receivers | 5 |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Data Rate | 120 kB/s |
| RS-232 Output Swing | Approximately ±9 V with 5 V supply |
| Charge-Pump Capacitors | 0.1 µF |
| Low Power | 15 mW |
| Receiver Input Levels | 30 V receiver input levels |
| Supported Standards | EIA-232-E and V.28 |
| Package | 28-SOIC, 0.295 inch / 7.50 mm width |
| Mounting Type | Surface mount |
| On-Board DC-DC Converters | Yes |
| Low-Power Shutdown | Yes |
| Plug-In Upgrade | MAX205-211/213 family compatibility stated in source data |
| Latch-Up | Latch-up free stated in source data |
| Packaging | Tube |
| RoHS Status | RoHS status not explicitly stated in supplied excerpts |
ADM211AR 28-soic, 0.295 inch / 7.50 mm width Pin Configuration Guide
Pin configuration for ADM211AR (28-soic, 0.295 inch / 7.50 mm width package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for ADM211AR.
Refer to the datasheet for full pin configuration.
Typical Applications
ADM211AR is suitable for 6 applications: Multi-Port RS-232 Interface Expansion, Industrial Data Acquisition, Test and Measurement Equipment, Legacy Serial Port Equipment, Embedded Serial Control Panels, Communication Port Concentrators.
Multi-Port RS-232 Interface Expansion
The ADM211AR fits equipment that needs more serial channels than a compact controller can provide directly. Its four drivers can support outbound RS-232 links, while five receivers add inbound channels for status, alarms, acknowledgements, or peripheral control. Because the device runs from 4.5 V to 5.5 V and uses integrated dc-to-dc converters, it can sit beside a 5 V digital controller without requiring a separate ±12 V rail. The 120 kB/s capability is suitable for many control and instrumentation links, while the 28-SOIC package keeps the channel consolidation compact. Confirm pin routing, charge-pump capacitors, and unused-channel states in the manufacturer datasheet.
Recommended
Industrial Data Acquisition
ADM211AR is suitable for industrial acquisition equipment that must collect multiple low-to-moderate-speed serial signals while using a 5 V system rail. The five receivers provide several independent input paths, and the four drivers can send commands or configuration data to remote instruments. Its approximately ±9 V output swing is consistent with the RS-232 signaling levels described in the supplied Analog Devices data. Designers should still assess surge, grounding, cable length, and isolation at the system level; the transceiver itself does not replace external protection. The 120 kB/s rate is useful for supervisory and configuration traffic but should be checked against the actual protocol timing.
Recommended
Test and Measurement Equipment
The ADM211AR can provide multiple RS-232 connections in test equipment, controllers, and laboratory instruments where a 5 V supply is available. Four transmit channels support remote commands, fixture control, or trigger distribution, and five receive channels support measurement results and equipment status. The integrated dc-to-dc converters simplify the power architecture, while the 0.1 µF capacitor requirement must be implemented according to the manufacturer layout guidance. For bench equipment, pay particular attention to grounding, connector protection, cable shielding, and isolation between chassis and logic ground. The part is a line interface, not a substitute for a complete surge-protection network.
Recommended
Legacy Serial Port Equipment
ADM211AR is appropriate for adding or preserving RS-232 connectivity on legacy serial equipment that operates from a 5 V logic supply. The four-driver, five-receiver arrangement allows a modern controller to retain several legacy ports without duplicating separate driver and receiver ICs. Its CMOS implementation and integrated charge-pump function are useful when ±12 V is not available at the connector. Before using it as a bridge between old and new equipment, verify connector pinouts, logic polarity, baud rate, cable length, and handshake signals. The maximum 120 kB/s figure is a device capability, not a guarantee that every legacy peripheral can operate at that rate.
Recommended
Embedded Serial Control Panels
The ADM211AR can serve embedded control panels and remote I/O modules that need several RS-232 ports for displays, relays, sensors, and service interfaces. Its 4.5 V to 5.5 V operating range aligns with many embedded 5 V power rails, and the integrated converters remove the need for a separate bipolar supply near the interface section. The five receivers are useful for collecting commands or status from multiple peripherals, while the four drivers can manage outbound control lines. Designers should budget for the specified 0.1 µF capacitors, validate charge-pump startup, and confirm that unused receiver and driver pins are configured exactly as required by the datasheet.
Recommended
Communication Port Concentrators
ADM211AR is useful in communication port concentrators that gather several RS-232 links into a common embedded controller. Four drivers support outbound channels, while five receivers provide flexible inbound connectivity for separate devices. The single-supply architecture is particularly helpful where equipment space and component count are constrained, because the on-board dc-to-dc converters provide approximately ±9 V output swing from 5 V. Application engineering should still define connector protection, common-mode behavior, ground references, and cable routing before production. Verify the complete datasheet for timing, enable logic, receiver thresholds, and absolute maximum conditions because those values are not fully present in the supplied excerpts.
Recommended
Recommended Products Summary
Engineering reference data for ADM211AR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADM211ARZ | ADM211AR-REEL |
|---|---|---|---|
| Package | 28-SOIC | 28-SOIC | 28-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices |
Key Differentiators
- Combines four drivers and five receivers in one interface IC (vs MAX211IDB)
- Operates from a single 5 V-class supply (vs MAX211IDB)
- Supports up to 120 kB/s RS-232 signaling (vs MAX213ECAI+)
Design Notes
Use a single 5 V supply within the verified 4.5 V to 5.5 V range and place local bypass capacitance close to the supply pins according to the manufacturer layout guidance. The integrated dc-to-dc converters generate the elevated and depressed voltages used by the RS-232 drivers, but external charge-pump capacitors are still required. Verify capacitor voltage rating, polarity, tolerance, and placement against the complete datasheet before release to production.
Keep the 0.1 µF charge-pump capacitor connections and their associated traces as short and clean as practical. Route RS-232 driver and receiver traces away from sensitive clocks, ADC inputs, and switching nodes where possible, and provide a controlled ground reference for the interface. The supplied data does not include a complete PCB reference design, so consult Analog Devices application guidance and the package pinout for exact placement.
Do not treat the ADM211 family relationship as proof that a MAX211, MAX213, or another RS-232 device is pin-compatible. The verified replacement search found no confirmed drop-in substitute. Check channel count, enable and shutdown logic, supply pins, charge-pump capacitor pins, receiver inputs, and connector polarity against the exact manufacturer datasheet. Also confirm the required operating-temperature grade before substituting any ordering suffix.
RS-232 cables can be long and exposed to industrial noise, so the transceiver should be paired with connector-level protection and a deliberate grounding strategy. Keep external protection components close to the connector and separate from the low-level logic return as appropriate for the system. Verify that protection devices do not distort valid RS-232 thresholds or introduce unacceptable leakage.
Compliance Information
The supplied excerpts do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Compliance must be confirmed from the current Analog Devices product documentation and applicable distributor records.
