CS42L52 datasheet(25/82 Pages) CIRRUS

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DS680A1

CS42L52

4. APPLICATIONS

4.1

Overview

4.1.1

Basic Architecture

The CS42L52 is a highly integrated, low power, 24-bit audio CODEC comprised of a stereo analog-to-

digital converter (ADC), a stereo digital-to-analog converter (DAC), a digital PWM modulator and two full-

bridge power back-ends. The ADC and DAC are designed using multi-bit delta-sigma techniques - the

DAC operates at an oversampling ratio of 128Fs and the ADC operates at 64Fs, where Fs is equal to the

system sample rate.

The different clock rates maximize power savings while maintaining high performance. The PWM modu-

lator operates at a fixed frequency of 384 kHz. The power FETs are configured for either stereo full-bridge

or mono parallel full bridge output. The CODEC operates in one of four sample rate speed modes: Quar-

ter, Half, Single and Double. It accepts and is capable of generating serial port clocks (SCLK, LRCK) de-

rived from an input Master Clock (MCLK).

4.1.2

Line & MIC Inputs

The analog input portion of the CODEC allows selection from and configuration of multiple combinations

of stereo and microphone (MIC) sources. Eight line inputs with an option for two balanced MIC inputs, a

MIC bias output and a Programmable Gain Amplifier (PGA) comprise the analog front-end.

4.1.3

Line & Headphone Outputs

The analog output portion of the CODEC includes a headphone amplifier capable of driving headphone

and line-level loads. An on-chip charge pump creates a negative headphone supply allowing a full-scale

output swing centered around ground. This eliminates the need for large DC-Blocking capacitors and al-

lows the amplifier to deliver more power to headphone loads at lower supply voltages.

4.1.4

Speaker Driver Outputs

The Class D power amplifiers drive 8 ohm (stereo) and 4 ohm (mono) speakers directly, without the need

for an external filter. The power MOSFETS are powered directly from a battery eliminating the efficiency

loss associated with an external regulator. Battery level monitoring and compensation maintains a steady

output as battery levels fall. A temperature monitor continually measures the die temperature and regis-

ters when predefined thresholds are exceeded. NOTE: The CS42L52 should only be used in captive

speaker systems where the outputs are permanently tied to the speaker terminals.

4.1.5

Fixed Function DSP Engine

The fixed-function digital signal processing engine processes both the PCM serial input data and ADC

output data, allowing a mix between the two. Independent volume control, left/right channel swaps, mono

mixes, tone control and limiting functions also comprise the DSP engine.

4.1.6

Beep Generator

The beep generator delivers tones at select frequencies across approximately two octave major scales.

With independent volume control, beeps may be configured to occur continuously, periodically, or at sin-

gle time intervals.

4.1.7

Power Management

Three control registers provide independent power-down control of the ADC, DAC, PGA, MIC pre-amp,

MIC bias, Headphone and Speaker outputs, allowing operation in select applications with minimal power

consumption.

CS42L52 Datasheet(PDF) 25 Page - Cirrus Logic

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