User Manual

2 DS680F2
CS42L52
3/1/13
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 Passthrough: 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 and 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 and 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 and 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
 Headphone/Speaker Detection Input
 Pop and Click Suppression
Applications
 Digital Voice Recorders, Digital Cameras, and
Camcorders
 PDA’s
 Personal Media Players
 Portable Game Consoles
General Description
The CS42L52 is a highly integrated, low-power stereo CO-
DEC 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
frequencies. 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 func-
tions 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.
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 Com-
mercial (-40 to +85 °C) grade. The CS42L52 Customer
Demonstration board is also available for device evaluation
and implementation suggestions. Refer to “Ordering Informa-
tion” on page 81 for complete ordering information.