CS4205
CrystalClear Audio Codec 97 for Portable Computing
!Three Analog Line-level Stereo Inputs for
Features
2 LINE IN, VIDEO, and AUX
!Integrated Asynchronous I S Input Port
!High Quality Pseudo-Differential CD Input
(ZV Port)
!Extensive Power Management Support
!Integrated High-Performance Microphone
!Meets or Exceeds the Microsoft PC 99 and
Pre-Amplifier
PC 2001 Audio Performance Requirements
! Integrated Digital Effects Processing for Bass
and Treble Response
Description
2
!Digital Docking Including an I S Output, 3
The CS4205 is an AC 97 2.1 compliant stereo audio co-
2
Synchronous I S Inputs
dec designed for PC multimedia systems. It uses
!Performance Oriented Digital Mixer
industry leading CrystalClear delta-sigma and mixed
signal technology. The CS405 is the first Cirrus AC 97
!SRS 3D Stereo Enhancement
audio codec to feature digital centric mixing and digital
!On-chip PLL for use with External Clock
effects. This advanced technology and these features
Sources
are designed to help enable the design of PC 99 and
PC 2001 compliant high-quality audio systems for desk-
!Dedicated Microphone Analog-to-Digital
top, portable, and entertainment PCs.
Converter
Coupling the CS4205 with a PCI audio accelerator or
!Sample Rate Converters
core logic supporting the AC 97 interface implements a
!S/PDIF Digital Audio Output
cost effective, superior quality audio solution. The
CS4205 surpasses PC 99, PC 2001, and AC 97 2.1 au-
!AC 97 2.1 Compliant
dio quality standards.
!PC Beep Bypass
ORDERING INFO
!20-bit Stereo Digital-to-Analog Converters
!18-bit Stereo Analog-to-Digital Converters
CS4205-KQZ, Lead Free 48-pin TQFP 9x9x1.4 mm
AC-LINK AND AC '97 ANALOG INPUT MUX
REGISTERS AND OUTPUT MIXER
18 bit
PWR
TEST SRC ADC
SYNC PCM_DATA LINE
MGT
(2ch)
BIT_CLK CD
INPUT
MUX
SDATA_OUT AUX
18 bit
AC
AC- SRC ADC
SDATA_IN MIC_PCM_DATA VIDEO
'97
LINK (1ch)
REG
RESET#
MIC1
GAIN / MUTE CONTROLS INPUT
MIXER
ID0# MIXER / MUX SELECTS MIC2
SIGNAL
PROCESSING
ID1#
ENGINE
PHONE
PC_BEEP
GPIO0/LRCLK
GPIO
GPIO1/SDOUT
OUTPUT
MIXER
S/PDIF
EAPD/SCLK
LINE_OUT
20 bit
SPDO/SDO2 SERIAL DATA PORT
SRC DAC
PCM_DATA MONO_OUT
GPIO[2:4]/SDI[1:3] ZV PORT (2ch)
ZSCLK,ZSDATA,ZLRCLK
This document contains information for a new product.
Preliminary Product Information
Cirrus Logic reserves the right to modify this product without notice.
JULY '05
Copyright Cirrus Logic, Inc. 2005
DS489PP4
CS4205
TABLE OF CONTENTS
1. CHARACTERISTICS AND SPECIFICATIONS ........................................................................ 6
ANALOG CHARACTERISTICS................................................................................................ 6
ABSOLUTE MAXIMUM RATINGS ........................................................................................... 7
RECOMMENDED OPERATING CONDITIONS ....................................................................... 7
AC 97 SERIAL PORT TIMING................................................................................................. 9
2. GENERAL DESCRIPTION ..................................................................................................... 12
2.1 AC-Link ............................................................................................................................ 12
2.2 Control Registers ............................................................................................................. 13
2.3 Sample Rate Converters .................................................................................................. 13
2.4 Mixers .............................................................................................................................. 13
2.5 Input Mux ......................................................................................................................... 13
2.6 Volume Control ................................................................................................................ 13
2.7 Dedicated Mic Record Path ............................................................................................. 13
3. DIGITAL SIGNAL PATHS ...................................................................................................... 15
3.1 Analog Centric Mode ....................................................................................................... 15
3.2 Digital Centric Mode ......................................................................................................... 16
3.3 Host Processing Mode ..................................................................................................... 16
3.4 Multi-Channel Mode .........................................................................................................16
4. AC-LINK FRAME DEFINITION .............................................................................................. 18
4.1 AC-Link Serial Data Output Frame .................................................................................. 19
4.1.1 Serial Data Output Slot Tags (Slot 0)............................................................................. 19
4.1.2 Command Address Port (Slot 1).................................................................................... 19
4.1.3 Command Data Port (Slot 2).......................................................................................... 20
4.1.4 PCM Playback Data (Slots 3-11) ................................................................................... 20
4.1.5 GPIO Pin Control (Slot12).............................................................................................. 20
4.2 AC-Link Serial Data Input Frame .....................................................................................21
4.2.1 Serial Data Input Slot Tag Bits (Slot 0) ........................................................................21
4.2.2 Status Address Port (Slot 1) .......................................................................................... 21
4.2.3 Status Data Port (Slot 2)................................................................................................ 22
4.2.4 PCM Capture Data (Slot 3-8,11).................................................................................... 22
Contacting Cirrus Logic Support
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