CS42L51
SYSTEM FEATURES
GENERAL DESCRIPTION
24-bit Converters
The CS42L51 is a highly integrated, 24-bit, 96 kHz, low
power stereo CODEC. Based on multi-bit, delta-sigma
modulation, it allows infinite sample rate adjustment be-
tween 4 kHz and 96 kHz. Both the ADC and DAC offer
many features suitable for low power, portable system
applications.
4 kHz to 96 kHz Sample Rate
Multi-bit Delta Sigma Architecture
Low Power Operation
–
Stereo Playback: 12.93 mW @ 1.8 V
–
Stereo Record and Playback: 20.18 mW @
1.8 V
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.
Variable Power Supplies
–
1.8 V to 2.5 V Digital & Analog
–
1.8 V to 3.3 V Interface Logic
Power Down Management
–
ADC, DAC, CODEC, MIC Pre-Amplifier,
PGA
Software Mode (I²C® & SPI™ Control)
Hardware Mode (Stand-Alone Control)
Digital Routing/Mixes:
The DAC output path includes a digital signal process-
ing engine. Tone Control provides bass and treble
adjustment of four selectable corner frequencies. The
Mixer allows independent volume control for both the
ADC mix and the PCM mix, as well as a master digital
volume control for the analog output. All volume level
changes may be configured to occur on soft ramp and
zero cross transitions. The DAC also includes de-em-
phasis, limiting functions and a beep generator
delivering tones selectable across a range of two full
octaves.
–
–
–
–
Analog Out = ADC + Digital In
Digital Out = ADC + Digital In
Internal Digital Loopback
Mono Mixes
Flexible Clocking Options
–
Master or Slave Operation
–
High-Impedance Digital Output Option (for
easy MUXing between CODEC and Other
Data Sources)
The stereo headphone amplifier is powered from a sep-
arate positive supply and the integrated charge pump
provides a negative supply. This allows a ground-cen-
tered analog output with a wide signal swing and
eliminates external DC-blocking capacitors.
–
Quarter-Speed Mode - (i.e. Allows 8 kHz Fs
while maintaining a flat noise floor up to
16 kHz)
In addition to its many features, the CS42L51 operates
from a low-voltage analog and digital core, making this
CODEC ideal for portable systems that require ex-
tremely low power consumption in a minimal amount of
space.
APPLICATIONS
HDD & Flash-Based Portable Audio Players
MD Players/Recorders
PDAs
The CS42L51 is available in a 32-pin QFN package in
both Commercial (-10 to +70° C) and Automotive
grades (-40 to +85° C). The CDB42L51 Customer Dem-
onstration board is also available for device evaluation
and implementation suggestions. Please see “Ordering
Information” on page 85 for complete details.
Personal Media Players
Portable Game Consoles
Digital Voice Recorders
Digital Camcorders
Digital Cameras
Smart Phones
2
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