ADAU1592ACPZ

Overview

The ADAU1592ACPZ is a two-channel, bridge-tied load (BTL) switching audio power amplifier with an integrated Sigma-Delta modulator. It accepts analog inputs and drives speakers directly via a pulse density modulation output. The device operates from a 9 V to 18 V power supply for the high-power stage, while logic and analog circuits use a 3.3 V supply. Key electrical parameters include a maximum output power of 24 W at 10% THD+N into a 4 Ω load, a typical total harmonic distortion plus noise of 0.005%, and a dynamic range of 101 dB. The package is a 48-lead LFCSP.

Feature Summary

• Integrates a fifth-order Sigma-Delta modulator with internal feedback from the power stage to minimize external component count and enhance linearity.
• Includes a programmable gain amplifier with selectable gains of 0 dB, 6 dB, 12 dB, or 18 dB controlled by digital input pins.
• Features an adjustable slicer block that limits input signal amplitude to control maximum output power without changing the supply voltage.
• Provides comprehensive protection mechanisms including thermal warning, thermal shutdown, and overcurrent detection with open-drain error flags.

Applications

• Flat panel televisions
• PC audio systems
• Mini-component stereo systems

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm packaging type and reel specifications. Ensure the procurement channel provides valid traceability for Analog Devices components. Confirm RoHS compliance status as indicated in the latest datasheet revision before finalizing orders.

Selection Notes

Select this component when a filterless Class-D solution is required to reduce bill-of-materials complexity. The integrated Sigma-Delta modulator eliminates the need for external LC filters. Consider the available PGA gain settings to match the source impedance and voltage levels of the preceding analog audio circuitry.

Part Context

This part belongs to the ADAU1592 series of high-performance audio power amplifiers manufactured by Analog Devices. It is designed for applications requiring high efficiency and low distortion in compact form factors. The device utilizes proprietary dynamic hysteresis to optimize switching frequency and efficiency across varying load conditions.

Replacement Considerations

Consult official Analog Devices documentation for confirmed cross-reference part numbers. Verify pin compatibility and thermal characteristics if substituting with other Class-D amplifiers.

FAQ

How is the output power limited in the ADAU1592?

Output power can be limited using the built-in slicer block. By connecting a resistor from the SLC_TH pin to ground, the threshold for the hard limiter is adjusted, clipping the input signal to the modulator to prevent excessive output power.

What is the function of the ERR and OTW pins?

The ERR (Error) and OTW (Overtemperature Warning) pins are open-drain outputs that indicate fault conditions. ERR goes low during thermal shutdown or overcurrent events, while OTW goes low when the junction temperature approaches the shutdown limit.