CS42L52 Datasheet, PDF (2/82 Pages) Cirrus Logic – Low Power, Stereo CODEC w/Headphone & Speaker Amps

System Features
 12, 24, and 27 MHz Master Clock Support in
Addition to Typical Audio Clock Rates
 High Performance 24-bit Converters
– Multi-bit Delta Sigma Architecture
– Very Low 64Fs Oversampling Clock Reduces
Power Consumption
 Low Power Operation
– Stereo Analog Passthru: 10 mW @ 1.8 V
– Stereo Playback: 14 mW @ 1.8 V
– Stereo Rec. and Playback: 23 mW @ 1.8 V
 Variable Power Supplies
– 1.8 V to 2.5 V Digital & Analog
– 1.6 V to 5 V Class D Amplifier
– 1.8 V to 2.5 V Headphone Amplifier
– 1.8 V to 3.3 V Interface Logic
 Power Down Management
– ADC, DAC, CODEC, MIC Pre-Amplifier, PGA,
Headphone Amplifier, Speaker Amplifier
 Analog & Digital Routing/Mixes:
– Line/Headphone Out = Analog In (ADC
Bypassed)
– Line/Headphone/Speaker
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 & other data
sources)
– Quarter-Speed Mode - (i.e. allows 8 kHz Fs
while maintaining a flat noise floor up to 16 kHz)
– 4 kHz to 96 kHz Sample Rates
 I²C^® Control Port Operation
 Temp. Monitor w/Thermal Foldback &
Shutdown
 Headphone/Speaker Detection Input
 Pop and Click Suppression
Applications
 Digital Voice Recorders, Digital Cameras &
Camcorders
 PDA’s
 Personal Media Players
 Portable Game Consoles
CS42L52
General Description
The CS42L52 is a highly integrated, low power stereo CODEC
with headphone and Class D speaker amplifiers. The
CS42L52 offers many features suitable for low power, porta-
ble system applications.
The ADC input path allows independent channel control of a
number of features. Input summing amplifiers mix and select
line-level and/or microphone level inputs for each channel.
The microphone input path includes a selectable programma-
ble-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 transi-
tions. The ADC also features a digital volume control with soft
ramp transitions. A programmable ALC and Noise Gate mon-
itor the input signals and adjust the volume levels
appropriately. To conserve power, the ADC may be bypassed
while still allowing full analog volume control.
The DAC output path includes a digital signal processing en-
gine with various fixed function controls.Tone Control provides
bass and treble adjustment of 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 Volume 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 also includes de-emphasis, limiting functions and a
BEEP generator delivering tones selectable across a range of
two full octaves.
The stereo headphone amplifier is powered from a separate
positive supply and the integrated charge pump provides a
negative supply. This allows a ground-centered analog output
with a wide signal swing and eliminates external DC-blocking
capacitors.
The Class D stereo speaker amplifier does not require an
external filter and provides the high efficiency amplification re-
quired by power sensitive portable applications. The speaker
amplifier may be powered directly from a battery while the in-
ternal DC supply monitoring and compensation provides a
constant gain level as the battery’s voltage decays. An internal
temperature monitor alerts the user and automatically atten-
uates and/or shuts down the PWM speaker output when an
overload condition causes temperatures to exceed safe oper-
ating levels.
In addition to its many features, the CS42L52 operates from a
low voltage analog and digital core making it ideal for portable
systems that require extremely low power consumption in a
minimal amount of space.
The CS42L52 is available in a 40-pin QFN package in both
Commercial (-40 to +85 °C) and Automotive (-40 to +105 °C)
grades. The CS42L52 Customer Demonstration board is also
available for device evaluation and implementation sugges-
tions. Please refer to “Ordering Information” on page 82 for
complete ordering information.
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DS680A1