CS53L21 datasheet(2/66 Pages) CIRRUS

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DS700PP1

CS53L21

APPLICATIONS

Portable Audio Players

Digital Microphones

Digital Voice Recorders

Voice Recognition Systems

Audio/Video Capture Cards

GENERAL DESCRIPTION

The CS53L21 is a highly integrated, 24-bit, 96 kHz, low

power stereo A/D. Based on multi-bit, delta-sigma mod-

ulation, it allows infinite sample rate adjustment

between 4 kHz and 96 kHz. The ADC offers many fea-

tures suitable for low power, portable system

applications.

The ADC input path allows independent channel control

of a number of features. An input multiplexer selects be-

tween line-level or microphone-level inputs for each

channel. The microphone input path includes a select-

able programmable-gain pre-amplifier stage and a low

noise MIC bias voltage supply. A PGA is available for

line or microphone inputs and provides analog gain with

soft ramp and zero cross transitions. The ADC also fea-

tures a digital volume attenuator with soft ramp

transitions. A programmable ALC and Noise Gate mon-

itor the input signals and adjust the volume levels

appropriately.

The Signal Processing Engine (SPE) controls left/right

channel volume mixing, channel swap and channel

mute functions. All volume-level changes may be con-

figured to occur on soft ramp and zero cross transitions.

The CS53L21 is available in a 32-pin QFN package in

both Commercial (-10 to +70° C) and Automotive

grades (-40 to +85° C). The CDB53L21 Customer Dem-

onstration board is also available for device evaluation

and implementation suggestions. Please see “Ordering

Information” on page 63 for complete details.

In addition to its many features, the CS53L21 operates

from a low-voltage analog and digital core, making this

A/D ideal for portable systems that require extremely

low power consumption in a minimal amount of space.

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