AD8594ARZ-REEL

Overview

The AD8594ARZ-REEL is a quad, single-supply, rail-to-rail input/output operational amplifier manufactured by Analog Devices Inc. It features a shutdown mode that reduces supply current to less than 1 μA when all amplifiers are deactivated. The device operates on a single supply voltage ranging from 2.5 V to 6 V and provides high output drive capability of ±250 mA per channel. Key electrical specifications include a gain bandwidth product of 3 MHz, a slew rate of 5 V/μs at 5 V supply, and an input bias current as low as 5 pA. The unit is specified for operation over the industrial temperature range of −40°C to +85°C.

Feature Summary

• Features a power-saving shutdown function that places outputs in a high impedance state and reduces total supply current to less than 1 μA.
• Provides high output current drive capability of ±250 mA with stability under virtually any capacitive load.
• Supports single-supply operation with rail-to-rail input and output voltage swing capabilities.
• Utilizes CMOS technology to achieve very low input bias currents suitable for integrators and diode amplification.

Applications

• Mobile communication handset audio
• PCMCIA/modem line driving
• Battery-powered instrumentation
• Data acquisition systems
• LCD display reference level drivers

Procurement Notes

Verify the specific package type and reel quantity against the manufacturer's ordering guide, as the REEL suffix indicates tape and reel packaging. Confirm the active status and lead times directly with authorized distributors or Analog Devices, as availability may vary by region. Ensure the component meets RoHS compliance requirements if mandated by your manufacturing standards.

Selection Notes

Select this component for applications requiring high current drive into heavy capacitive loads or battery-operated devices needing low standby power. The quad configuration allows multiple channels in a single package, reducing board space compared to individual amplifiers. Consider the 3 MHz bandwidth and 5 V/μs slew rate for moderate-speed signal processing tasks within the 2.5 V to 6 V supply range.

Part Context

The AD8594ARZ-REEL belongs to the AD859x family of single-supply, rail-to-rail operational amplifiers, which includes the single-channel AD8591 and dual-channel AD8592 variants. This family is designed for portable multimedia and telecommunications applications due to its combination of high output drive, low power consumption, and integrated shutdown functionality.

Replacement Considerations

Direct substitutes within the same family include the AD8591 (single channel) and AD8592 (dual channel). Verify pin compatibility and functional equivalence before substitution, particularly regarding the shutdown control logic and output drive capabilities.

FAQ

How does the shutdown mode affect the amplifier outputs?

When the shutdown input is activated, all amplifier outputs enter a high impedance state, effectively disconnecting them from the circuit while minimizing supply current consumption.

Is the AD8594 stable with capacitive loads?

Yes, the AD8594 is designed to be stable with virtually any capacitive load and can drive up to 10 nF directly without external compensation components.