CS42L56
SYSTEM FEATURES
GENERAL DESCRIPTION
Audio (11.2896 MHz or 12.288 MHz) or USB
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.
(12 MHz) Master Clock Input
Low-power Operation
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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
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-
log in to analog out path to the headphone and line
amplifiers, bypassing the ADC and DAC.
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Multi-bit Delta–Sigma Architecture
Integrated High Efficient Power Management
Reduces Power Consumption
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Step-down Charge Pump Improves
Efficiency
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Inverting Charge Pump Accommodates
Low System Voltage by Providing Negative
Rail for HP/Line Amp
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.
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LDO Reg. Provides Low Digital Supply
Voltage
Digital Power Reduction
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–
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
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–
Line/Headphone Out = Analog In (ADC
Bypassed)
Line/Headphone Out = ADC Out
Internal Digital Loopback
Mono Mixes
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.
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–
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I²C or SPI™ Control Port
I²S or Left-justified Digital Interface Format
Flexible Clocking Options
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Master or Slave Operation
Wide Range of Sample Rates Supported
APPLICATIONS
These features make the CS42L56 the ideal solution for
portable applications which require extremely low pow-
er consumption in a minimal amount of space.
HDD and Flash-based Portable Audio Players
PDAs
Personal Media Players
Portable Game Consoles
Digital Voice Recorders
MD Players/Recorders
Digital Camcorders
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.
Digital Cameras
Smart Phones
2
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