Chips aimed at simplifying digital audio

Cirrus Logic has announced two ICs which it claims will ease the task of designing smartphones and other mobile devices.

The CS42L73 is a low-power smart audio codec which can offload audio-related tasks from the phone’s application processor, giving better audio quality and battery life, the company said, adding that the CS35L0X is an analogue-input hybrid Class D amplifier which consumes less power in standby mode than other amplifier ICs while also lowering EMI.

“What we’re trying to do for our customers is focus on removing passive components as much as possible and make their job easier,” said Jason Rhode, Cirrus Logic’s CEO. “With this codec, functionality is massively improved and at the same time the power is lower and so is the bill of materials.”

With three serial audio ports and asynchronous sample rate converters, the CS42L73 can route, process and mix a variety of multi-format audio signals, such as voice, music, ring tones and streaming audio, Rhode said. Its rated power consumption is just 4mW for a voice call, or only 3.5mW for stereo playback to the headphone.

“The aim is not to wake the apps processor, but for example an MP3 and a ring tone are at different sample rates so we need integrated rate conversion,” Rhode noted.

The CS35L0X amplifier family uses a closed-loop Delta Sigma architecture and hybrid Class D technology to provide Class D efficiency and output power but with the low idle current consumption and minimal EMI found typically only in class AB amplifiers, according to Cirrus Logic.

Rhode added that the chip is “capable of driving 3W from 1.2mm² on the board, with a quiescent current in a realistic design of just 2mA.”

The CS42L73 is provided in a 64-ball WLCSP package and priced at $1.95 in quantities of 10,000. The CS35L0X is available in a 10-pin DFN package or a 9-ball WLCSP package, and costs around $0.35 in quantities of 10,000.

Further information:
www.cirrus.com

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