AD8398ACPZ-R2

Overview

The AD8398A is a dual high-speed voltage feedback operational amplifier configured as a differential line driver for ADSL2+ and VDSL2 applications. It delivers an 85 MHz bandwidth, 600 V/µs slew rate, and 450 mA peak linear output current. The device supports ±6 V or +12 V supplies, achieving an 18.4 V p-p differential swing into a 20 Ω load. It features four power modes controlled by PD0 and PD1 pins, reducing quiescent current to 0.7 mA in shutdown.

Feature Summary

• Integrated power management with four selectable operating modes via CMOS-compatible control pins
• High linearity performance optimized for discrete multitone signals in xDSL systems
• Thermally enhanced 4 mm × 4 mm 16-lead LFCSP package with electrically isolated exposed paddle

Applications

• ADSL2+/VDSL2 central office and customer premises equipment line drivers
• Power line communications (PLC) line drivers
• Consumer xDSL modems
• Twisted pair line drivers

Procurement Notes

Verify the specific ordering suffix (R2, R7, or RL) against the required reel quantity, as these denote different packaging formats rather than functional differences. Confirm RoHS compliance status, indicated by the Z suffix in the part number. Ensure the design accounts for the thermally enhanced package requirements and proper PCB layout for thermal dissipation.

Selection Notes

Select this component for applications requiring high output current and wide bandwidth in twisted pair transmission. Evaluate the power consumption profiles across the four available modes to balance performance and energy efficiency. Consider the single-supply (+12 V) or dual-supply (±6 V) operation options based on system power architecture constraints.

Part Context

The AD8398A belongs to Analog Devices' specialized line driver family designed for broadband access networks. It integrates two voltage feedback amplifiers into a single compact package, replacing discrete solutions. The device is engineered to meet the stringent linearity and drive requirements of modern DSL standards while offering flexible power management capabilities.

Replacement Considerations

Publicly confirmed substitutes include the AD8398ACPZ-R7 and AD8398ACPZ-RL, which share identical electrical specifications and pinouts but differ only in tape and reel packaging quantities. No other functional alternatives are documented in the provided source material.

FAQ

How does the exposed paddle affect the electrical connection?

The exposed paddle is electrically isolated from the internal circuitry. However, it must be connected to a solid ground plane layer to ensure adequate heat transfer away from the die.

What is the purpose of the PD0 and PD1 pins?

These pins select one of four operating modes: full power, medium power, low power, or complete power-down, allowing for dynamic power management.

Can the AD8398A operate with a single supply voltage?

Yes, the device can operate with a single +12 V supply or a dual ±6 V supply configuration.