CS42L51
Low-Power, Stereo Codec with Headphone Amp
DIGITAL-TO-ANALOG FEATURES ANALOG-TO-DIGITAL FEATURES
98-dB dynamic range (A-weighted) 98-dB dynamic range (A-weighted)
-86-dB THD+N -88-dB THD+N
Headphone amplifier - GND centered Analog gain controls
On-chip charge pump provides VA_HP +32-dB or +16-dB mic preamplifiers
No DC-blocking capacitor required Analog programmable gain amplifier (PGA)
46-mW power into stereo 16 @ 1.8 V
+20-dB digital boost
88-mW power into stereo 16 @ 2.5 V
Programmable automatic level control (ALC)
-75 dB THD+N Noise gate for noise suppression
Programmable threshold and
Digital signal processing engine
attack/release rates
Bass & treble tone control, de-emphasis
Independent channel control
PCM + ADC mix with independent volume
control
Digital volume control
Master digital volume control
High-pass filter disable for DC measurements
Soft ramp & zero-cross transitions
Stereo 3:1 analog input MUX
Beep generator Dual mic inputs
Tone selections across two octaves Programmable, low noise mic bias levels
Separate volume control Differential mic mix for common mode
noise rejection
Programmable on & off time intervals
Very low 64 Fs oversampling clock reduces
Continuous, periodic or one-shot beep
power consumption
selections
Programmable peak-detect and limiter
Pop and click suppression
1.8Vto3.3V 1.8Vto2.5V 1.8Vto2.5V 1.8Vto2.5V
MUX Switched Headphone
CapacitorDAC AmpGND LeftHPOut
Digital
andFilter
Centered
SerialAudio
Signal
Beep
Multibit
Input
Generator
Processing
Modulator
Switched Headphone
Engine
CapacitorDAC
AmpGND RightHPOut
HardwareMode
MUX andFilter
Centered
2
orI C&SPI
SoftwareMode
ControlData Charge
Pump
ALC
Reset
StereoInput1
Multibit
StereoInput2
Oversampling MUX
PGA
ADC
Volume +32dB
HighPass
MUX
SerialAudio
StereoInput3/
Controls
Filters
Output
MicInput1&2
Multibit
+32dB
Oversampling MUX PGA
ADC
MIC
Register
Bias
ALC
Configuration
Copyright Cirrus Logic, Inc. 20052015
DS679F2
(All Rights Reserved)
AUG 15
CS42L51
SYSTEM FEATURES GENERAL DESCRIPTION
24-bit converters
The CS42L51 is a highly integrated, 24-bit, 96-kHz, low
496-kHz sample rate
power stereo codec. Based on multi-bit, delta-sigma
Multibit deltasigma architecture
modulation, it allows infinite sample rate adjustment be-
tween 4 kHz and 96 kHz. Both the ADC and DAC offer
Low power operation
many features suitable for low power, portable system
Stereo playback: 12.93 mW @ 1.8 V
applications.
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-
Variable power supplies
tween line-level or microphone level inputs for each
1.82.5 V digital & analog
channel. The microphone input path includes a select-
1.83.3 V interface logic
able programmable-gain pre-amplifier stage and a low
Power down management noise MIC bias voltage supply. A PGA is available for
line or microphone inputs and provides analog gain with
ADC, DAC, codec, mic preamplifier, PGA
soft ramp and zero-cross transitions. The ADC also fea-
Software Mode (IC and SPI control)
tures a digital volume attenuator with soft ramp
Hardware mode (stand-alone control)
transitions. A programmable ALC and Noise Gate mon-
Digital routing/mixes: itor the input signals and adjust the volume levels
appropriately.
Analog out = ADC + Digital In
Digital out = ADC + Digital In
The DAC output path includes a digital signal process-
ing engine. Tone Control provides bass and treble
Internal digital loopback
adjustment of four selectable corner frequencies. The
Mono mixes
Mixer allows independent volume control for both the
Flexible clocking options
ADC mix and the PCM mix, as well as a master digital
Master or slave operation
volume control for the analog output. All volume level
changes may be configured to occur on soft ramp and
High-impedance digital output option (for
zero-cross transitions. The DAC also includes de-em-
easy MUXing between the codec and other
data sources) phasis, limiting functions and a beep generator
delivering tones selectable across a range of two full
Quarter-speed mode (i.e., Allows 8 kHz Fs
octaves.
while maintaining a flat noise floor up to
16 kHz)
The stereo headphone amplifier is powered from a sep-
arate positive supply and the integrated charge pump
APPLICATIONS
provides a negative supply. This allows a ground-cen-
HDD and flash-based portable audio players
tered analog output with a wide signal swing and
MD players/recorders
eliminates external DC-blocking capacitors.
PDAs
In addition to its many features, the CS42L51 operates
Personal media players
from a low-voltage analog and digital core, making this
codec ideal for portable systems that require extremely
Portable game consoles
low power consumption in a minimal amount of space.
Digital voice recorders
The CS42L51 is available in a 32-pin QFN package in
Digital camcorders
both Commercial (-10 to +70 C) and Automotive
Digital cameras
grades (-40 to +85 C). The CDB42L51 Customer
Smart phones
Demonstration board is also available for device evalu-
ation and implementation suggestions. Please see
Ordering Information on page 83 for complete details.
2 DS679F2