ADM1385ARSZ-REEL

Overview

The ADM1385ARSZ-REEL is a low-power, dual-channel RS-232 transceiver manufactured by Analog Devices Inc. It operates from a single 3.3 V power supply and supports data rates up to 460 kbps while meeting EIA-232E specifications. The device utilizes four external 0.1 μF charge pump capacitors to generate the necessary internal voltage levels. It features a complete shutdown mode that reduces quiescent current to less than 0.5 μA, making it suitable for battery-powered applications. The component is housed in a 20-lead SSOP package.

Feature Summary

• Integrated charge pump voltage converter generates internal positive and negative supplies from a single 3.3 V input using external capacitors.
• Includes a driver disable mode and a complete shutdown mode to minimize power consumption during idle periods.
• Receivers feature Schmitt-trigger inputs with hysteresis to ensure error-free reception of noisy signals or slow transition times.
• CMOS technology implementation ensures low power dissipation to maximize battery life in portable instruments.

Applications

• General-purpose RS-232 data links
• Portable instruments
• Printers, palmtop computers, and PDAs

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and compliance status. Ensure the procurement channel provides valid traceability for the Analog Devices part number. Confirm that the reel packaging matches the required quantity specifications for the production line.

Selection Notes

Select this component when a dual-channel RS-232 interface is required with minimal power consumption at 3.3 V. The ADM1385 offers a complete shutdown mode distinct from the enable-only feature found in similar parts like the ADM3222. Verify that the application requires the specific pinout configuration provided by the 20-lead SSOP package option.

Part Context

The ADM1385 is part of the ADM3202/ADM3222/ADM1385 family of high-speed RS-232/V.28 interface devices. It serves as an upgrade for legacy components such as the MAX3222/MAX3232 and LTC1385. The device is designed to be plug-in compatible with derivatives of the AD230 to AD241 family, maintaining similar application profiles while offering enhanced low-power capabilities.

Replacement Considerations

Public confirmed substitute part numbers include ADM3222ARSZ-REEL7 and ADM1385ARSZ-REEL7.

FAQ

What are the specific control pins available on the ADM1385?

The ADM1385 includes a Driver Disable (DD) pin and a Shutdown (SD) pin. The DD pin turns off the charge pump and disables transmitters while keeping receivers active. The SD pin shuts down the charge pump and disables all transmitters and receivers.

How does the ADM1385 handle unconnected receiver inputs?

Each RS-232 receiver input has an internal 5 kΩ pull-down resistor to ground. This pulls unconnected inputs to 0 V, resulting in a Logic 1 output level.

What is the maximum data rate supported by the ADM1385?

The device supports a maximum data rate of 460 kbps when operating at VCC = 3.3 V under specified load conditions.