ADM222AR - 200 kbps Dual RS-232 Transceiver | Analog Devices
MPN: ADM222AR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.92 | $1.92 |
| 10 | $1.92 | $19.20 |
| 100 | $1.92 | $192.00 |
| 500 | $1.92 | $960.00 |
| 1,000 | $1.92 | $1,920.00 |
ADM222AR Overview
An RS-232 transceiver is the interface category that connects a CMOS or TTL-based digital system to the bipolar signal domain used by serial equipment. The RS-232 driver converts logic-level signals into positive and negative voltage levels, while the receiver converts those bipolar levels back into logic-compatible signals. The ADM222 belongs to the broader interface IC hierarchy and combines line drivers, line receivers, and charge-pump circuitry in one package.
The ADM222AR provides two transmit channels and two receive channels, allowing bidirectional RS-232 links between two systems. Its 200 kbps data rate supports faster serial communication than many conventional RS-232 transceivers. The 0.1 µF charge-pump capacitors reduce external capacitance requirements, while the shutdown pin can reduce supply current to 0.1 µA according to the manufacturer product information.
Its 5 V supply architecture simplifies integration with digital logic. The on-board DC-DC converter develops the positive and negative voltage levels needed for RS-232 transmission, while the 9 V output swing and 30 V receiver input range provide useful line-level margin. The device is identified as a 2/2 full RS-232 transceiver and is available in the 18-SOIC surface-mount package denoted by the DigiKey listing.
Typical uses include RS-232 test equipment, instrumentation, industrial serial links, data acquisition systems, and legacy peripheral connections. Designers should verify the exact package pinout and line-level timing requirements in the Analog Devices datasheet before layout. Charge-pump capacitor placement and supply decoupling remain important because they influence output voltage generation and signal integrity.
This page consolidates verified Analog Devices product information, distributor package details, technical feature data, and practical RS-232 design guidance. It also distinguishes the ADM222AR from functional alternatives by emphasizing the verified 18-SOIC package, 200 kbps rate, 5 V operation, and shutdown function.
Drop-in alternatives for ADM222AR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ADM222AR (same form factor and footprint) — differing in Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADM222ARZ
✅ Drop-In✓ In Stock
$2.1 / Unit
View Datasheet →MAX222IDW
✅ Drop-In📋 Reference alternative (not in catalog)
MAX222IDWR
✅ Drop-In📋 Reference alternative (not in catalog)
ADM222AR Specifications
| Product Type | RS-232 transceiver |
| Supply Voltage | 5 V |
| Transmission Rate | 200 kbps |
| Number of Drivers | 2 |
| Number of Receivers | 2 |
| Charge-Pump Capacitor | 0.1 µF |
| RS-232 Output Swing | 9 V |
| Receiver Input Voltage | 30 V |
| Shutdown Supply Current | 0.1 µA |
| Standard Compliance | EIA-232-E and V.28 |
| DC-DC Converter | On-board |
| Interface Type | Full RS-232 |
| Package | 18-SOIC |
| Mounting Type | Surface Mount |
ADM222AR 18-soic Pin Configuration Guide
Pin configuration for ADM222AR (18-soic 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 ADM222AR.
Refer to the datasheet for full pin configuration.
Typical Applications
ADM222AR is suitable for 6 applications: RS-232 Test and Measurement Equipment, Industrial Serial Data Acquisition, Legacy Peripheral Connectivity, Data Loggers and Programmable Instruments, Communication and Network Equipment, Shutdown-Controlled Embedded Systems.
RS-232 Test and Measurement Equipment
The ADM222AR fits legacy RS-232 control and data links in test instruments because it combines two drivers, two receivers, a 200 kbps rate, and a single 5 V supply. It can be placed between a controller and an instrument when the system needs both transmit and receive paths. The integrated charge pump accepts 0.1 µF capacitors, reducing the external support circuitry required for bipolar RS-232 levels. Confirm the instrument’s connector pinout and cable shielding before deployment.
Recommended
Industrial Serial Data Acquisition
The ADM222AR is suitable for industrial serial data-acquisition equipment that still relies on RS-232 communications but operates from a 5 V digital rail. Its 200 kbps transmission rate provides a higher communication rate than traditional low-speed RS-232 links, while the two-driver, two-receiver arrangement supports bidirectional control and measurement data. Use the EIA-232-E and V.28 requirements as the baseline, then validate cable length, grounding, and noise immunity in the installed system.
Recommended
Legacy Peripheral Connectivity
The ADM222AR can provide the physical interface between a modern controller and a legacy RS-232 peripheral. Two integrated drivers and two receivers allow the controller to send commands and receive responses without separate line-driver ICs. Its 5 V operation simplifies connection to digital logic, while the shutdown pin can disable the transceiver during idle periods and reduce supply current to 0.1 µA according to Analog Devices product information.
Recommended
Data Loggers and Programmable Instruments
A data logger or programmable instrument can use the ADM222AR for host-to-device command exchange and result transfer. The 200 kbps data rate is useful for systems that need responsive RS-232 communication, and the integrated DC-DC converter generates the required bipolar levels from one 5 V supply. Keep the charge-pump and interface traces short, provide local supply decoupling, and confirm the device’s operating-temperature requirements before using it in field equipment.
Recommended
Communication and Network Equipment
The ADM222AR can be used in communication equipment that still exposes an RS-232 management or service port. Its two transmit and two receive channels support bidirectional service-console connections, while the 5 V supply requirement is convenient for systems built around digital controllers. The device should be paired with appropriate serial connectors, transient protection, and cable routing; the supplied data does not specify external ESD or surge-protection components.
Recommended
Shutdown-Controlled Embedded Systems
Embedded systems can use the ADM222AR shutdown control to reduce power when an RS-232 port is not actively used. The Analog Devices product information states that the shutdown function can reduce supply current to 0.1 µA. This makes the device suitable for power-conscious controllers that periodically wake, exchange data, and return the transceiver to a disabled state. The host firmware must manage the shutdown pin and wake timing correctly.
Recommended
Recommended Products Summary
Engineering reference data for ADM222AR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADM222 | MAX222IDW | MAX222IDWR |
|---|---|---|---|---|
| Package | 18-SOIC | 18-SOIC | 18-SOIC | 18-SOIC |
| Brand | Analog Devices | Analog Devices | Maxim Integrated | Maxim Integrated |
| Drivers | 2 | 2 | 2 | 2 |
| Receivers | 2 | 2 | 2 | 2 |
Key Differentiators
- Single 5 V RS-232 operation with integrated charge pump (vs MAX222IDW)
- 200 kbps transmission rate (vs MAX222IDWR)
- Shutdown control and low shutdown current (vs MAX222IDW)
Design Notes
Keep the ADM222AR charge-pump capacitor connections short and place the capacitors close to the pins specified by the Analog Devices reference layout. The verified device uses 0.1 µF capacitors, but the supplied data does not include exact land patterns, capacitor voltage ratings, or placement coordinates. Use the manufacturer datasheet and reference layout as the authority during PCB implementation.
Provide a clean 5 V supply and local decoupling near the ADM222AR. The integrated charge pump derives the positive and negative RS-232 levels from the single supply, so supply noise and ground-return paths can affect transmitted levels and receiver behavior. Confirm the manufacturer’s recommended capacitor network and bypass requirements before releasing the schematic.
Do not assume that any dual-driver, dual-receiver RS-232 IC is automatically replaceable. Verify the 18-SOIC footprint, every pin name, shutdown polarity, charge-pump pin assignments, receiver thresholds, and timing limits against the complete datasheets. The supplied search results identify MAX222 comparison candidates, but do not fully establish pin-for-pin equivalence.
For cable-attached RS-232 links, keep the transceiver-side traces compact and connect the signal-ground reference properly according to the system architecture. The verified ADM222AR data specifies a 200 kbps rate and 30 V receiver input capability, but it does not specify the complete system-level ESD, surge, or cable-length limits. Add appropriate protection only after checking the required standards and interface topology.
Compliance Information
The supplied verified data contains EIA-232-E and V.28 interface requirements but does not provide RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations.
