CS42L56 datasheet(2/92 Pages) CIRRUS

2 / 92 page

DS851F2

CS42L56

SYSTEM FEATURES



Audio (11.2896 MHz or 12.288 MHz) or USB

(12 MHz) Master Clock Input



Low-power Operation

– Stereo Anlg. Passthrough: 3.3 mW @1.8 V

– Stereo Rec. and Playback: 8.3 mW @1.8 V



Headphone Detect Input



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 ADC/DAC Oversampling Rate

– Bursted Serial Clock Providing up to 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 or SPI™ Control Port



I²S or Left-justified Digital Interface Format



Flexible Clocking Options

– Master or Slave Operation

– Wide Range of Sample Rates Supported

APPLICATIONS



HDD and Flash-based Portable Audio Players



PDAs



Personal Media Players



Portable Game Consoles



Digital Voice Recorders



MD Players/Recorders



Digital Camcorders



Digital Cameras



Smart Phones

GENERAL DESCRIPTION

The CS42L56 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 CS42L56 the ideal solution for

portable applications which require extremely low pow-

er consumption in a minimal amount of space.

The CS42L56 is available in a 40-pin QFN package for

the Commercial (-40 to +85° C) grade. The CDB42L56

Customer Demonstration board is also available for de-

vice evaluation and implementation suggestions.

Please see “Ordering Information” on page 93 for com-

plete details.

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