CS4245 104 dB, 24-Bit, 192 kHz Stereo Audio CODEC dB, 24-Bit, 192 kHz Stereo Audio CODEC ... – Available for A/D, D/A, CODEC, Mic ... 6.3.5 DAC Master / Slave Mode

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  • CS4245

    104 dB, 24-Bit, 192 kHz Stereo Audio CODEC

    D/A Features Multi-bit Delta Sigma Modulator 104 dB Dynamic Range -90 dB THD+N Up to 192 kHz Sampling Rates Single-Ended Analog Architecture Volume Control with Soft Ramp

    0.5 dB Step Size Zero Crossing, Click-Free Transitions

    Popguard Technology Minimizes the Effects of Output Transients

    Filtered Line-Level Outputs Selectable Serial Audio Interface Formats

    Left-Justified up to 24-bit IS up to 24-bit Right-Justified 16-, 18-, 20-, and 24-bit

    Selectable 50/15 s De-Emphasis Control Output for External Muting

    A/D Features

    Multi-bit Delta Sigma Modulator

    104 dB Dynamic Range

    -95 dB THD+N

    Stereo 6:1 Input Multiplexer

    Programmable Gain Amplifier (PGA) 12 dB Gain, 0.5 dB Step Size Zero Crossing, Click-Free Transitions

    Stereo Microphone Inputs +32 dB Gain Stage Low-Noise Bias Supply

    Up to 192 kHz Sampling Rates

    Selectable Serial Audio Interface Formats Left-Justified up to 24-bit IS up to 24-bit

    High-Pass Filter or DC Offset Calibration

    1.8 V to 5 V

    MultibitModulator

    MultibitModulator

    Low-LatencyAnti-Alias Filter

    Internal Voltage Reference

    InterpolationFilter

    InterpolationFilter

    Left DAC Output

    Right DAC OutputSwitched Capacitor DAC and Filter

    MultibitOversampling

    ADC

    MultibitOversampling

    ADCLow-Latency

    Anti-Alias Filter

    High Pass Filter

    High Pass Filter

    Stereo Input 1

    Serial Audio Input

    Serial Audio

    Output

    3.3 V to 5 V 3.3 V to 5 V

    Switched Capacitor DAC and Filter

    MUX

    PGA

    MUX

    Volume Control

    Volume Control

    PC

    M S

    eria

    l Int

    erfa

    ceP

    CM

    Ser

    ial I

    nter

    face

    Mute Control

    Register Configuration

    Leve

    l Tr

    ansl

    ator

    Leve

    l Tra

    nsla

    tor

    Leve

    l Tr

    ansl

    ator

    Reset

    I2C/SPIControl Data

    Mute Control

    Left Aux OutputRight Aux Output

    Stereo Input 2Stereo Input 3

    Stereo Input 4 / Mic Input 1 & 2

    Stereo Input 5Stereo Input 6

    PGA+32 dB

    +32 dB

    Interrupt

    ADC Overflow

    Copyright Cirrus Logic, Inc. 2012(All Rights Reserved)

    http://www.cirrus.comAUG '12

    DS656F3

    http://www.cirrus.comhttp://www.cirrus.comhttp://www.cirrus.com

  • CS4245

    System Features

    Direct Interface with 1.8 V to 5 V Logic Levels

    Optional Asynchronous Serial Port Operation Each Serial Port Supports Master or Slave

    Operation

    Selectable Auxiliary Analog Output Allows Analog Monitoring of Either the ADC

    Input Signal after PGA or DAC Output Signal

    Internal Digital Loopback

    Power-Down Mode Available for A/D, D/A, CODEC, Mic

    Preamplifier

    +3.3 V to +5 V Analog Power Supply

    +3.3 V to +5 V Digital Power Supply

    Supports IC and SPITM Control Port Interfaces

    Pin-Compatible with CS5345

    General Description

    The CS4245 is a h ighly integrated stereo audioCODEC. The CS4245 performs stereo analog-to-digital(A/D) and digital-to-analog (D/A) conversion of up to24-bit serial values at sample rates up to 192 kHz.

    A 6:1 stereo input multiplexer is included for s electingbetween line-level or microphone-level inputs. The mi-crophone input path includes a +32 dB gain stage anda low-noise bias voltage supply. The PGA is availablefor line or microphone inputs and provides gain/attenu-ation of 12 dB in 0.5 dB steps.

    The output of the PGA is followed by an advanced 5th-order, multi-bit delta sigma modulator and digital filter-ing/decimation. Sampled data is transmitted by theserial audio interface at rates from 4 kHz to 192 kHz ineither Slave or Master Mode.

    The D/A converter is based on a 4th-order multi-bit deltasigma modulator with an ultra-linear low-pass filter andoffers a volume control that operates with a 0.5 dB stepsize. It in corporates selectable soft ramp and zerocrossing transition functions to eliminate clicks andpops.

    Standard 50/15 s de-emphasis is availa ble for a44.1 kHz sample rate for compatibility with digital audioprograms mastered using the 50 /15 s pre-emphasistechnique.

    Integrated level translators allow ea sy interfacing be-tween the CS4245 and other devices operating over awide range of logic levels.

    The CS4245 is available in a 48-pin LQFP package inboth Commercial (-10 to +70 C) and Automotive (-40to +105 C) grade. The CDB4245 Customer Demon-stration board is also available for device evaluation andimplementation suggestions. Please see Ordering In-formation on page 58 for complete details.

    2 DS656F3

    http://www.cirrus.com

  • CS4245

    TABLE OF CONTENTS

    1. PIN DESCRIPTIONS ........................................................................................................................ 72. CHARACTERISTICS AND SPECIFICATIONS ...................................................................................... 9

    SPECIFIED OPERATING CONDITIONS ............................................................................................. 9ABSOLUTE MAXIMUM RATINGS ....................................................................................................... 9DAC ANALOG CHARACTERISTICS ................................................................................................. 10DAC COMBINED INTERPOLATION & ON-CHIP ANALOG FILTER RESPONSE ............................ 11ADC ANALOG CHARACTERISTICS ................................................................................................. 13ADC ANALOG CHARACTERISTICS ................................................................................................. 15ADC DIGITAL FILTER CHARACTERISTICS ..................................................................................... 16AUXILIARY OUTPUT ANALOG CHARACTERISTICS ...................................................................... 17AUXILIARY OUTPUT ANALOG CHARACTERISTICS ...................................................................... 18AUXILIARY OUTPUT ANALOG CHARACTERISTICS ...................................................................... 19DC ELECTRICAL CHARACTERISTICS ............................................................................................. 20DIGITAL INTERFACE CHARACTERISTICS ...................................................................................... 21SWITCHING CHARACTERISTICS - SERIAL AUDIO PORT 1 .......................................................... 22SWITCHING CHARACTERISTICS - SERIAL AUDIO PORT 2 .......................................................... 24SWITCHING CHARACTERISTICS - CONTROL PORT - IC FORMAT ............................................ 27SWITCHING CHARACTERISTICS - CONTROL PORT - SPI FORMAT ........................................... 28

    3. TYPICAL CONNECTION DIAGRAM ................................................................................................... 294. APPLICATIONS ................................................................................................................................... 30

    4.1 Recommended Power-Up Sequence ............................................................................................. 304.2 System Clocking ............................................................................................................................. 30

    4.2.1 Synchronous / Asynchronous Mode ...................................................................................... 304.2.2 Master Clock ......................................................................................................................... 304.2.3 Master Mode ......................................................................................................................... 324.2.4 Slave Mode ........................................................................................................................... 32

    4.3 High-Pass Filter and DC Offset Calibration .................................................................................... 324.4 Analog Input Multiplexer, PGA, and Mic Gain ................................................................................ 344.5 Input Connections ........................................................................................................................... 344.6 Output Connections ........................................................................................................................ 344.7 Output Transient Control ................................................................................................................ 35

    4.7.1 Power-Up .............................................................................................................................. 354.7.2 Power-Down .......................................................................................................................... 354.7.3 Serial Interface Clock Changes ............................................................................................. 35

    4.8 Auxiliary Analog Output .................................................................................................................. 354.9 De-Emphasis Filter ......................................................................................................................... 354.10 Internal Digital Loopback .............................................................................................................. 364.11 Mute Control ................................................................................................................................. 364.12 Control Port Description and Timing ...............

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