AS1702V

Overview

The AS1702V is a single-channel differential audio power amplifier designed for portable devices. It operates on a single supply voltage ranging from 2.7V to 5.5V and delivers up to 1.8W of continuous average power into a 4Ω load with less than 1% total harmonic distortion plus noise. The device features adjustable gain via external components, integrated click-and-pop suppression, and a low-power shutdown mode consuming less than 100nA. It utilizes a bridge-tied load configuration to minimize external component count and is available in a 10-pin DFN package.

Feature Summary

• Differential input design provides improved noise rejection and common-mode rejection capabilities.
• Bridge-tied load (BTL) architecture minimizes external component requirements while delivering high-fidelity amplification.
• Integrated shutdown circuitry reduces quiescent current consumption to less than 100nA.
• Built-in click-and-pop suppression circuitry minimizes audible transients during power-up and shutdown.

Applications

• MP3 and CD players
• Mobile phones
• Portable DVD players

Procurement Notes

Verify the specific ordering code suffix 'V' corresponds to the 10-pin DFN package variant as defined in the manufacturer's ordering information table. Confirm that the application requires adjustable gain functionality, which necessitates the inclusion of external feedback resistors. Ensure the system design accommodates the specified operating temperature range and supply voltage limits to maintain performance reliability.

Selection Notes

Select this component when an adjustable gain setting is required for the audio front-end. The AS1702V differs from fixed-gain variants by allowing gain customization through external resistor networks. Verify that the target application supports the BTL output configuration and can accommodate the necessary biasing components. Consider the thermal dissipation characteristics if operating near maximum power levels.

Part Context

The AS1702V belongs to the AS1702-AS1705 family of 1.8W single-channel audio power amplifiers manufactured by austriamicrosystems. This family shares identical pinouts and core functionalities, differing primarily in their internal or external gain configurations. The V suffix specifically denotes the 10-pin DFN package option within this product line.

Replacement Considerations

The datasheet confirms pin compatibility with National Semiconductor LM4895 and Maxim MAX9718A/B/C/D. These parts may serve as direct replacements provided the gain requirements and electrical specifications align with the system design constraints.

FAQ

How is the gain configured for the AS1702V?

The AS1702V features adjustable gain set by external feedback resistors (RF and RIN). The voltage gain is determined by the ratio of these resistors, unlike other models in the series that have fixed internal gains.

What is the function of the SHDM pin?

The SHDM pin controls the polarity of the shutdown input (SHDN). Driving SHDM high configures SHDN for active-low operation, while driving it low configures SHDN for active-high operation.