Description

The AS1702, AS1703, AS1704, and AS1705 are singlechannel differential audio power-amplifiers designed to drive 4 and 8 Ohm loads. The integrated gain circuitry of these amplifiers and their small size make them ideal for 2.7- to 5V-powered portable audio devices.

The differential input design improves noise rejection and provides common-mode rejection. A bridge-tied load (BTL) design minimizes external component count, while providing Hi-Fi audio power amplification.

The devices deliver 1.8W continuous average power per channel to a 4 Ohm load with less than 1% total harmonic distortion (plus noise), while operating from a single 2.7 to 5V supply.

In order to facilitate reduced component designs, the devices are available with different gain levels:

• AS1702 - Adjustable Gain (via external components)
• AS1703 - AV = 0dB
• AS1704 - AV = 3dB
• AS1705 - AV = 6dB

Integrated shutdown circuitry disables the bias generator and amplifiers, and reduces quiescent current consumption to less than 100nA. The shutdown input can be set as active-high or active-low. All devices contain comprehensive click-and-pop suppression circuitry that reduces audible clicks and pops during power-up and shutdown.

The AS1702, AS1703, AS1704, and AS1705 are pin compatible with the LM4895 and the MAX9718A/B/C/D.

The devices are available in a 10-pin MSOP and 10-pin DFN package.