CS42L52 datasheet(2/82 Pages) CIRRUS

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DS680A1

CS42L52

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

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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