ADM222AN - 200 kbps Dual RS-232 Transceiver | Analog Devices
MPN: ADM222AN ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.94 | $7.94 |
| 10 | $7.15 | $71.50 |
| 100 | $6.37 | $637.00 |
| 500 | $5.73 | $2,865.00 |
| 1,000 | $5.09 | $5,090.00 |
ADM222AN Overview
An RS-232 transceiver is an interface IC that combines line drivers and line receivers so digital logic can communicate across a noisy, ground-offset-prone serial link. Its hierarchy is RS-232 transceiver → serial interface transceiver → line-driver/receiver IC → interface semiconductor. The ADM222 belongs to the high-speed CMOS RS-232 family alongside ADM232A and ADM242, combining logic-level interfacing with the voltage conversion required by RS-232.
The ADM222 provides 2 drivers and 2 receivers, enabling two simplex links or one full-duplex RS-232 port. Its 200 kbps transmission rate is substantially faster than conventional low-speed RS-232 links. A 5 V-only power architecture simplifies system supply design, while the external 0.1 µF charge-pump capacitors support generation of bipolar signal levels. The stated 9 V output swing provides the required positive and negative line-drive voltage.
The receiver input rating extends to 30 V, providing useful transient and voltage-range margin when connected to external RS-232 equipment. The device also includes a shutdown pin, allowing the transceiver to reduce activity when the interface is not required. Exact propagation-delay, input-threshold, output-current, supply-current, and temperature values are not present in the supplied search data and therefore require confirmation from the manufacturer datasheet.
Typical uses include industrial serial-control links, test equipment, instrumentation, data-acquisition systems, and legacy peripheral connections. In each case, the two receiver/driver channels can support bidirectional communication when TX and RX signals are crossed appropriately. The 200 kbps rate can also shorten transfer time compared with slower RS-232 implementations, provided the connected equipment, cable, and protocol support that throughput.
For implementation, place the 0.1 µF charge-pump capacitors close to their designated pins and route RS-232 traces away from sensitive analog and clock signals. Confirm every unused input and output state, especially when placing the part between systems with different logic voltage levels. Do not infer an unqualified alternative from functional similarity; a true drop-in replacement must match the 18-pin footprint and pin functions.
This page combines verified Analog Devices product information, distributor identification, sourcing links, and design-oriented RS-232 considerations. It distinguishes documented values from unavailable specifications and does not treat general functional equivalents as guaranteed pin-to-pin replacements.
Drop-in alternatives for ADM222AN — 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 ADM222AN (same form factor and footprint) — differing in Package, Product Type, Mounting Type, Number of Drivers, Number of Receivers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADM222ARZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.1 / Unit
View Datasheet →MAX232IN
✅ Drop-In📋 Reference alternative (not in catalog)
MAX232D
✅ Drop-In✓ In Stock
$0.62 / Unit
View Datasheet →MAX211CDB
✅ Drop-In✓ In Stock
$3.2251 / Unit
View Datasheet →MAX211IDB
✅ Drop-In✓ In Stock
$1.41 / Unit
View Datasheet →ADM222AN Specifications
| Product Type | RS-232 transceiver |
| Number of Drivers | 2 |
| Number of Receivers | 2 |
| Transmission Rate | 200 kbps |
| Supply Voltage | 5 V |
| Charge-Pump Capacitor | 0.1 µF |
| DC-DC Converter | On-board |
| Output Swing | 9 V |
| Receiver Maximum Input Voltage | 30 V |
| Driver and Receiver Configuration | 2/2 transceiver |
| Shutdown Function | Yes |
| Package | 18-pin PDIP |
| Mounting Type | Through-hole |
| Technology | CMOS |
| Interface Standard | RS-232 |
| Compliance Standard | EIA-232-E and V.28 |
ADM222AN 18-pin pdip Pin Configuration Guide
Pin configuration for ADM222AN (18-pin pdip 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 ADM222AN.
Refer to the datasheet for full pin configuration.
Typical Applications
ADM222AN is suitable for 6 applications: Industrial serial-control interfaces, Test and measurement equipment, Data-acquisition systems, Legacy peripheral connectivity, Instrumentation and diagnostics, Programmable controller links.
Industrial serial-control interfaces
The ADM222AN fits industrial equipment that needs a compact, logic-side 5 V interface to an RS-232 port. Its two drivers and two receivers support either two unidirectional channels or a full-duplex arrangement, while the verified 200 kbps capability provides more throughput than conventional low-speed serial links. The on-board charge pump generates bipolar levels from one 5 V supply using 0.1 µF capacitors, reducing the need for a separate negative rail. Designers should still verify common-mode range, grounding, and connector requirements against the connected controller.
Recommended
Test and measurement equipment
The ADM222AN is appropriate for legacy RS-232 control and data ports on test instruments because it combines 2/2 channel capacity with operation from one 5 V supply. Its 200 kbps maximum transmission rate can reduce command and result-transfer time when both endpoints support that rate. The 9 V RS-232 output swing and 30 V receiver input capability provide the stated bipolar operating levels and input range. Front-end designers should preserve signal-to-ground routing, use an appropriate connector and retention scheme, and isolate ground offsets in bench systems.
Recommended
Data-acquisition systems
The ADM222AN can connect a 5 V controller to external RS-232 instruments that use two communication channels. Its CMOS RS-232 transceiver operates up to 200 kbps and provides a 9 V output swing, while the receiver input is specified to 30 V. The device therefore fits legacy acquisition modules that require bipolar signaling without a separate power supply. Engineers should calculate transfer time including protocol overhead, keep charge-pump capacitors close to their pins, and isolate the interface from high-noise analog sections.
Recommended
Legacy peripheral connectivity
The ADM222AN provides a practical upgrade path for 5 V logic interfacing to older RS-232 peripherals while retaining a through-hole 18-pin PDIP package. Its two transmitters and two receivers are useful for command plus status channels, and the shutdown function allows controlled interface states. At up to 200 kbps, the part can support faster legacy transfers when both ends support the higher rate. Before redesigning an existing board, compare every pin, charge-pump capacitor connection, and enable state with the original device's datasheet.
Recommended
Instrumentation and diagnostics
The ADM222AN is suitable for instrumentation service ports that require a compact two-channel RS-232 interface and controlled shutdown. Its single 5 V supply architecture simplifies low-voltage equipment, while the verified 200 kbps data rate supports responsive configuration and diagnostic exchanges. The 30 V receiver input rating offers margin within the stated interface limits, but it should not be interpreted as unlimited surge protection. External protection may still be needed for cables exposed to electrostatic discharge or severe industrial transients.
Recommended
Programmable controller links
The ADM222AN can connect a programmable controller to legacy serial equipment where the system provides 5 V logic and requires RS-232-compatible levels. Two drivers and two receivers allow bidirectional command, response, and hardware-handshake paths. The verified 200 kbps capability is useful for configuration blocks, although the actual transfer rate remains limited by the peripheral and protocol. Firmware developers should define behavior when the shutdown pin changes the interface state and should avoid assuming modem-control signals not established in the supplied data.
Recommended
Recommended Products Summary
Engineering reference data for ADM222AN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADM222ARZ | MAX232IN | MAX232D | MAX211CDB | MAX211IDB |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 18-pin PDIP | 18-pin PDIP | 18-pin PDIP | 18-pin PDIP | 18-pin PDIP | 18-pin PDIP |
| Product Type | RS-232 transceiver | RS-232 transceiver | RS-232 transceiver | RS-232 transceiver | RS-232 transceiver | RS-232 transceiver |
Key Differentiators
- Verified 200 kbps operation (vs MAX232IN)
- Two drivers and two receivers (vs MAX211CDB)
- Small charge-pump capacitors (vs ADM222ARZ)
Design Notes
Place the two 0.1 µF charge-pump capacitors close to the pins identified by the Analog Devices datasheet and keep their return-current paths short. Route driver outputs away from clocks, ADC inputs, reference nodes, and audio circuitry because RS-232 transitions are bipolar and relatively high slew. Maintain a continuous logic ground reference under the IC and route the cable-side return according to the complete interface grounding strategy.
Do not treat every dual RS-232 transceiver as pin-compatible merely because it uses an 18-pin PDIP package. Before substituting, compare pin numbers, driver and receiver directions, charge-pump capacitor connections, shutdown polarity, input thresholds, propagation timing, and supply requirements. The ADM222AN provides a shutdown pin and uses 0.1 µF capacitors; assuming another family's control or capacitor arrangement matches can prevent startup or corrupt communication.
The ADM222AN supports rates up to 200 kbps, so preserve a controlled return path and avoid long unprotected stubs. For cable-attached equipment, evaluate ground-offset tolerance and transient exposure at the connector rather than assuming the stated 30 V receiver input rating provides complete surge protection. External protection may be appropriate where cables leave an enclosure or enter industrial environments.
Compliance Information
The verified product information identifies EIA-232-E and V.28 compliance but does not provide RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations. RoHS and REACH may be mentioned elsewhere on the official product page, but they are absent from the supplied excerpts and are therefore recorded as unknown.
