A/D converter captures audio for portable recording apps

Austin, Texas — Cirrus Logic Inc. launched a low-power, analog-to-digital (A/D) converter today that is said to provide high quality audio capture capabilities for portable digital audio recording applications, such as digital voice recorders, voice recognition systems, digital microphones and audio video capture cards.

Based on an advanced multibit delta-sigma architecture, the 24-bit, 96 kHz, CS53L21 converter provides two channels of high-quality signal conversion with front-end analog integration to simplify designs and eliminate costly devices from customer designs, said Jason Rhode, vice president and general manager, Mixed-Signal Audio Products Division, Cirrus Logic. It allows infinite sample rate adjustment between 4 kHz and 96 kHz.

An input multiplexer allows for switching between three different stereo analog sources, followed by a programmable gain amplifier with a gain range of +12 dB to 3 dB in 0.5 step sizes. An on-chip dual microphone preamplifier and a programmable low-noise bias supply for external electret microphones are also included.

The CS53L21 A/D converter supports independent control of the left and right channel audio, including digital volume control and mixing, automatic level control and the ability to disable the high pass filters for DC measurements.

Operating from a single power supply of either 1.8 volt or 2.5 V, the CS53L21 consumes less than 9 milliwatts of power and supports a direct interface to logic levels from 1.8 V to 3.3 V. The IC is offered in a 32-lead QFN package (5 x 5 mm) and is specified at 98 dB dynamic range. Total harmonic distortion plus noise is -88 dB for the CS53L21.

See related block diagram

The CS53L21 A/D converter is currently sampling with volume production expected to begin in the March quarter. The CS53L21 is available in a 32-lead QFN package and is priced at $1.75 in 10,000-piece quantities. Click here for the CS53L21 product folder.

Cirrus Logic Inc. , 1-800-625-4084,

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