AD7306ARZ

Overview

The AD7306ARZ 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. 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 speeds up to 5 MHz. The device operates within a temperature range of -40°C to +85°C.

Feature Summary

• Integrates dual RS-232 and single RS-422 interfaces on one chip
• Internal charge pump enables operation from a single +5 V supply
• Configurable receiver path selectable between RS-232 and RS-422 modes
• High-speed RS-422 operation with low timing skew between complementary outputs

Applications

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

Procurement Notes

Verify the specific package variant, as the AD7306 series includes both SOIC and DIP options. Confirm that the 'Z' suffix indicates RoHS compliance. Ensure the industrial temperature grade (-40°C to +85°C) matches the application requirements, distinguishing it from commercial variants. Check for any specific ordering suffixes that might affect availability or packaging format.

Selection Notes

Select this component when a single-chip solution is required for mixed RS-232 and RS-422 communication. It is suitable for applications needing high-speed differential transmission alongside standard serial interfaces. Consider the internal charge pump capability if bipolar power supplies are unavailable. Verify that the 100 kHz RS-232 rate and 5 MHz RS-422 rate meet system speed requirements.

Part Context

The AD7306 is part of Analog Devices' interface IC portfolio designed for serial communication standards. It bridges TTL/CMOS logic levels to EIA RS-232 and RS-422 signal levels. The ARZ suffix denotes the 24-lead Standard Small Outline Package (SOIC) version with RoHS compliance, intended for surface-mount assembly in industrial environments.

Replacement Considerations

Public confirmed substitutes include other Analog Devices RS-232/RS-422 transceivers such as the ADM213 series, though pinouts and feature sets like shutdown pins may differ. Verify functional compatibility regarding driver/receiver counts and voltage levels before substitution.

FAQ

What capacitor values are required for the internal charge pump?

The AD7306 requires four 0.1 μF capacitors for the charge pump voltage generator. These can be non-polarized or polarized types.

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

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

What is the maximum data rate for the RS-422 channel?

The RS-422 channel supports high-speed communications up to 5 MHz.