AD7306JNZ

Overview

The AD7306JNZ 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 signaling. The device utilizes an internal charge pump to generate ±10 V levels using four 0.1 μF capacitors. It supports data rates up to 100 kHz for RS-232 and 5 MHz for RS-422. The component operates within a commercial temperature range of 0°C to +70°C and is housed in a 24-lead plastic DIP package.

Feature Summary

• Integrates dual RS-232 and single RS-422 channels on one chip
• Operates from a single +5 V supply with internal charge pump
• Configurable receiver path selectable via dedicated control 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 JNZ indicates the industrial/commercial temperature grade and PDIP-24 package configuration as defined by Analog Devices. Confirm RoHS compliance status through official manufacturer documentation or authorized distributors. Ensure the ordering part number matches the required package style and thermal rating for the target application environment before finalizing procurement.

Selection Notes

Select this component when a mixed protocol interface requiring both RS-232 and RS-422 signals is necessary within a single package footprint. The internal charge pump eliminates the need for external bipolar power supplies, simplifying board design. Verify that the required data rate does not exceed 100 kHz for RS-232 applications or 5 MHz for RS-422 applications to ensure signal integrity.

Part Context

The AD7306 series provides a unified solution for interfacing TTL/CMOS logic with standard serial communication protocols. By combining distinct driver and receiver paths for different standards, it reduces component count compared to discrete implementations. This integration supports compact designs in systems requiring versatile serial connectivity options without sacrificing performance or reliability.

Replacement Considerations

Direct functional replacements include other models within the AD7306 family, such as AD7306ANZ for the same electrical specifications but potentially different packaging or qualification. Cross-referencing pinouts and voltage requirements is essential when substituting with devices from other manufacturers to ensure compatibility with existing circuit layouts.

FAQ

How is the receiver mode configured between RS-232 and RS-422?

The receiver mode is selected using the 232/422 SEL input pin. A Logic 1 selects RS-232 operation, while a Logic 0 selects RS-422 operation for the R1IN/R1IN(A) input.

What capacitor values are required for the internal charge pump?

Four non-polarized or polarized capacitors of 0.1 μF each are required. These connect between V+ and GND, C1+ and C1–, C2+ and C2–, and V– and GND.

Does the device support shutdown modes?

No, the AD7306 does not feature a shutdown mode. It operates continuously once powered, relying on internal current limiting for fault protection rather than power-down states.