ADAU1592ACPZ-RL

Overview

The ADAU1592ACPZ-RL is a two-channel, bridge-tied load (BTL) Class-D audio power amplifier manufactured by Analog Devices Inc. It integrates a fifth-order Sigma-Delta modulator and a high-power output stage within an LFCSP-48 package. The device operates from a power supply voltage range of 9 V to 18 V, while the analog and digital logic sections utilize a 3.3 V supply. Key electrical specifications include a total harmonic distortion plus noise (THD+N) of 0.005%, a dynamic range of 101 dB, and a power supply rejection ratio exceeding 65 dB. It delivers up to 18 W into an 8 Ω load at 1% THD+N.

Feature Summary

• Integrates a fifth-order Sigma-Delta modulator with internal feedback from the power stage to minimize external component count and enhance linearity.
• Features an on-chip slicer block that allows users to limit maximum output power by adjusting the input signal threshold via an external resistor.
• Includes comprehensive protection circuits for thermal warning, thermal shutdown, and overcurrent conditions, signaled through open-drain error outputs.
• Offers programmable gain settings selectable via digital control pins to accommodate various input signal levels.

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 ensure correct packaging configuration. Confirm that the component meets all applicable environmental compliance standards required for your manufacturing process. Cross-reference the datasheet revision history to ensure compatibility with existing design parameters and pin assignments.

Selection Notes

Select this component when designing systems requiring integrated modulation and high-efficiency amplification without external filter components. Consider the available PGA gain options to match the source signal amplitude. Evaluate the thermal dissipation requirements based on the intended load impedance and supply voltage to ensure operation within the specified junction temperature limits.

Part Context

This part belongs to the ADAU1592 series of switching audio power amplifiers. It is designed for applications demanding high fidelity and efficiency in compact form factors. The integration of the modulator directly with the power stage distinguishes it from traditional PWM amplifiers that require separate driver and modulator stages.

Replacement Considerations

Consult official documentation for confirmed substitute part numbers before implementation.

FAQ

How is the maximum output power limited in this amplifier?

The output power can be limited using the built-in slicer block. By connecting a resistor from the SLC_TH pin to ground, the user sets a threshold voltage that clips the input signal to the modulator, thereby capping the maximum output power.

What mechanism does the ADAU1592 use to generate the switching output?

It utilizes a fifth-order Sigma-Delta modulator that converts the analog input into a pulse density modulation (PDM) bit stream. This approach avoids distinct sharp peaks found in fixed-frequency PWM, reducing EMI and improving audio quality.