CS42L55 datasheet(2/73 Pages) CIRRUS

2 / 73 page

DS773F1

CS42L55

SYSTEM FEATURES

High Performance 24-bit Converters

–

Multi-bit Delta Sigma Architecture

Integrated High Efficient Power Management

Reduces Power Consumption

–

Step-Down Charge Pump Improves

Efficiency

–

Inverting Charge Pump Accommodates

Low System Voltage by Providing Negative

Rail for HP/Line Amp

–

LDO Reg. Provides Low Digital Supply

Voltage

Digital Power Reduction

–

Very Low Oversampling Rate for

Converters

–

Bursted Serial Clock Providing 24 Bits per

Sample

Power Down Management

–

ADC, DAC, CODEC, PGA, DSP

Analog & Digital Routing/Mixes

–

Line/Headphone Out = Analog In (ADC

Bypassed)

–

Line/Headphone Out = ADC Out

–

Internal Digital Loopback

–

Mono Mixes

I²C® Control Port

I²S Digital Interface Format

Flexible Clocking Options

–

Master or Slave Operation

–

High-Impedance Digital Output Select

(used for easy MUXing between CODEC

and other data sources)

–

8.000, 11.029, 12.000, 16.000, 22.059,

24.000, 32.000, 44.118 and 48.000 kHz

Sample Rates

APPLICATIONS

HDD & Flash-Based Portable Audio Players

MD Players/Recorders

PDAs

Personal Media Players

Portable Game Consoles

Digital Voice Recorders

Digital Camcorders

Digital Cameras

Smart Phones

GENERAL DESCRIPTION

The CS42L55 is a highly integrated, 24-bit, ultra-low

power stereo CODEC based on multi-bit delta-sigma

modulation. Both the ADC and DAC offer many features

suitable for low power portable system applications.

The analog input path allows independent channel

control of a variety of features. The Programmable Gain

Amplifier (PGA) provides analog gain with zero cross

transitions. The ADC path includes a digital volume at-

tenuator with soft ramp transitions and a programmable

ALC and noise gate monitor the input signals and adjust

the volume appropriately. An analog passthrough also

exists, accommodating a lower noise, lower power ana-

amplifiers, bypassing the ADC and DAC.

The DAC output path includes a fixed-function digital

signal processing engine. Tone control provides bass

and treble adjustment at four selectable corner frequen-

cies. The digital mixer provides independent volume

control for both the ADC output and PCM input signal

paths, as well as a master volume control. Digital vol-

ume controls may be configured to change on soft ramp

transitions while the analog controls can be configured

to occur on every zero crossing. The DAC path also in-

cludes de-emphasis, limiting functions and a beep

generator delivering tones selectable across a range of

two full octaves.

The Class H stereo headphone amplifier combines the

efficiency of an integrated step-down and inverting

charge pump with the linearity and low EMI of a Class

AB amplifier. A step-down/inverting charge pump oper-

ates in two modes: +/-VCP mode or +/-(VCP/2) mode.

Based on the amplifier’s output signal, internal logic au-

tomatically adjusts the output of the charge pump,

+VHPFILT and –VHPFILT, to optimize efficiency. With

these features, the amplifier delivers a ground-centered

output with a large signal swing even at low voltages

and eliminates the need for external DC-blocking

capacitors.

These features make the CS42L55 the ideal solution for

portable applications that require extremely low power

consumption in a minimal amount of space.

The CS42L55 is available in a 36-pin QFN package for

the

Commercial

(-40°C

+85°C)

grade.

The

CDB42L55 Customer Demonstration board is also

available for device evaluation and implementation sug-

gestions. Please see “Ordering Information” on page 73

for complete details.

CS42L55 Datasheet(PDF) 2 Page - Cirrus Logic

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