AD7306JN

Overview

The AD7306JN is a monolithic RS-232/RS-422 transceiver operating from a single +5 V supply. It integrates two RS-232 drivers, one RS-422 driver, one RS-232 receiver, and one configurable receiver for RS-232 or RS-422 signals. The internal charge pump generates ±10 V levels using four 0.1 μF capacitors. RS-232 channels support data rates up to 100 kHz, while RS-422 channels support high-speed communications up to 5 MHz. The device operates within a temperature range of 0°C to +70°C.

Feature Summary

• Integrates RS-232 and RS-422 interfaces on a single chip with TTL compatibility
• Internal charge pump enables operation from a single +5 V supply without external bipolar sources
• Configurable receiver path selectable between RS-232 and RS-422 modes via the SEL pin
• Includes short circuit protection and ESD protection on all inputs

Applications

• DTE-DCE Interface
• Packet Switching
• Local Area Networks
• Data Concentration
• Integrated Services Digital Network (ISDN)

Procurement Notes

Verify the specific suffix 'JN' against the official Analog Devices ordering guide, as standard listings often specify 'JNZ' for RoHS-compliant plastic DIP packages. Confirm that the commercial temperature grade (0°C to +70°C) aligns with system requirements. Ensure sourcing channels provide valid traceability documentation for this legacy component series.

Selection Notes

Select this component when a design requires both RS-232 and RS-422 connectivity within a single package footprint. It is suitable for applications needing low power consumption due to BiCMOS technology. The internal charge pump simplifies board layout by eliminating the need for external negative voltage generators. Verify that the 100 kHz RS-232 rate meets the application's speed needs.

Part Context

The AD7306 belongs to the Analog Devices RS-232/RS-422 interface family. It serves as a bridge between TTL logic levels and dual standard EIA signal levels. The JN variant denotes the industrial/commercial grade in a 24-lead plastic DIP package. This part consolidates multiple interface functions to reduce component count in mixed-standard communication systems.

Replacement Considerations

Direct replacements include other AD7306 variants such as AD7306ANZ for industrial temperature ranges or AD7306JRZ for surface mount applications. Cross-vendor alternatives should be evaluated carefully, as pinouts and charge pump capacitor requirements may differ significantly.

FAQ

How is the receiver configured for RS-232 or RS-422?

The receiver configuration is determined by the logic level on the 232/422 SEL pin. A Logic 1 selects RS-232 operation, while a Logic 0 selects RS-422 operation.

What are the maximum data rates supported?

The RS-232 channels support communications rates up to 100 kHz. The RS-422 channels support high-speed communications up to 5 MHz.

Does the device require external bipolar power supplies?

No. An internal charge pump voltage converter generates the necessary ±10 V levels from a single +5 V supply, requiring only four 0.1 μF capacitors.