7 DAP 1

(0x51−

0x57)

SDIN1-L (L)

(1)

SDIN1-R (R)

SDIN2-L (LS)

SDIN2-R (RS)

SDIN3-L (LBS)

SDIN3-R (RBS)

SDIN4-L (C)

SDIN4-R (LFE)

IP Mixer 1

C 0x41)

8 × 8

Crossbar

Input Mixer

Master Vol

(0xD9)

DAP 1

Volume

(0xD1)

Max Vol

Bass and

Treble 1

(0xDA−

0xDD)

Loud-

ness

(0x91−

0x95)

OP Mixer 1

C 0xAA)

8 × 2 Output

Mixer

L to

PWM1

DRC1

(0x96−

0x9C)

7 DAP 2

(0x58−

0x5E)

SDIN1-L (L)

SDIN1-R (R)

(1)

SDIN2-L (LS)

SDIN2-R (RS)

SDIN3-L (LBS)

SDIN3-R (RBS)

SDIN4-L (C)

SDIN4-R (LFE)

IP Mixer 2

C 0x42)

8 × 8

Crossbar

Input Mixer

Master Vol

(0xD9)

DAP 2

Volume

(0xD2)

Max Vol

Bass and

Treble 1

(0xDA−

0xDD)

Loud-

ness

(0x91−

0x95)

OP Mixer 2

C 0xAB)

8 × 2 Output

Mixer

R to

PWM2

DRC1

(0x96−

0x9C)

SDIN1-L (L)

SDIN1-R (R)

SDIN2-L (LS)

(1)

SDIN2-R (RS)

SDIN3-L (LBS)

SDIN3-R (RBS)

SDIN4-L (C)

SDIN4-R (LFE)

IP Mixer 3

C 0x43)

8 × 8

Crossbar

Input Mixer

Master Vol

(0xD9)

OP Mixer 3

C 0xAC)

8 × 2 Output

Mixer

LS to

PWM3

SDIN1-L (L)

SDIN1-R (R)

SDIN2-L (LS)

SDIN2-R (RS)

(1)

SDIN3-L (LBS)

SDIN3-R (RBS)

SDIN4-L (C)

SDIN4-R (LFE)

IP Mixer 4

C 0x44)

8 × 8

Crossbar

Input Mixer

Master Vol

(0xD9)

OP Mixer 4

C 0xAD)

8 × 2 Output

Mixer

RS to

PWM4

SDIN1-L (L)

SDIN1-R (R)

SDIN2-L (LS)

SDIN2-R (RS)

SDIN3-L (LBS)

(1)

SDIN3-R (RBS)

SDIN4-L (C)

SDIN4-R (LFE)

IP Mixer 5

C 0x45)

8 × 8

Crossbar

Input Mixer

Master Vol

(0xD9)

OP Mixer 5

C 0xAE)

8 × 2 Output

Mixer

LBS to

PWM5

SDIN1-L (L)

SDIN1-R (R)

SDIN2-L (LS)

SDIN2-R (RS)

SDIN3-L (LBS)

SDIN3-R (RBS)

(1)

SDIN4-L (C)

SDIN4-R (LFE)

IP Mixer 6

C 0x46)

8 × 8

Crossbar

Input Mixer

Master Vol

(0xD9)

OP Mixer 6

C 0xAF)

8 × 2 Output

Mixer

RBS to

PWM6

SDIN1-L (L)

SDIN1-R (R)

SDIN2-L (LS)

SDIN2-R (RS)

SDIN3-L (LBS)

SDIN3-R (RBS)

SDIN4-L (C)

(1)

SDIN4-R (LFE)

IP Mixer 7

C 0x47)

8 × 8

Crossbar

Input Mixer

Master Vol

(0xD9)

OP Mixer 7

C 0xB0)

8 × 3 Output

Mixer

C to

PWM7

5 DAP 8

(0x84−

0x88)

SDIN1-L (L)

SDIN1-R (R)

SDIN2-L (LS)

SDIN2-R (RS)

SDIN3-L (LBS)

SDIN3-R (RBS)

SDIN4-L (C)

SDIN4-R (LFE)

(1)

IP Mixer 8

C 0x48)

8 × 8

Crossbar

Input Mixer

Master Vol

(0xD9)

DAP 8

Volume

(0xD8)

Max Vol

Bass and

Treble 4

(0xDA−

0xDD)

Loud-

ness

(0x91−

0x95)

OP Mixer 8

C 0xB1)

8 × 3 Output

Mixer

Sub to

PWM8

DRC2

(0x9D−

0xA1)

2 DAP 8

(0x82−

0x83)

B0015-01

DAP 3

Volume

(0xD3)

DAP 4

Volume

(0xD4)

DAP 5

Volume

(0xD5)

DAP 6

Volume

(0xD6)

DAP 7

Volume

(0xD7)

TAS5518C

8-ChannelDigitalAudioPWMProcessor

SLES238A–SEPTEMBER2008–REVISEDJULY2009

www.ti.com

(1)Defaultinputs

Figure2-2.TAS5518CArchitectureWithI

CRegisters(f

=176.4kHzorf

=192kHz)

Description 22SubmitDocumentationFeedback

Not Recommended For New Designs

Biquads

Series

Bass

and

Treble

Loudness

DRC

Input

Mixer

1 Other

Channel Output

From 7 Available

32-Bit

Trunc

PWM

Proc

A_to_ipmix

B_to_ipmix

SDIN1

C_to_ipmix

D_to_ipmix

SDIN2

Left

Right

Channel Volume

Bass and Treble

Bypass

Bass

and

Treble

Inline

Pre-

Volume

Post-

Volume

Output

Gain

Output Mixer Sums

Any Two Channels

PWM

Output

Left

Right

DRC

Bypass

DRC

Inline

E_to_ipmix

F_to_ipmix

SDIN3

G_to_ipmix

H_to_ipmix

SDIN4

Left

Right

Left

Right

B0016-01

Master

Volume

Max

Volume

2.3.2I

CCoefficientNumberFormats

2.3.2.128-Bit5.23NumberFormat

TAS5518C

8-ChannelDigitalAudioPWMProcessor

www.ti.com

SLES238A–SEPTEMBER2008–REVISEDJULY2009

Figure2-3.TAS5518CDetailedChannelProcessing

ThearchitectureoftheTAS5518CiscontainedinROMresourceswithintheTAS5518Candcannotbe

altered.However,mixergain,leveloffset,andfiltertapcoefficients,whichcanbeenteredviatheI

Cbus

interface,provideauserwiththeflexibilitytosettheTAS5518Ctoaconfigurationthatachieves

system-levelgoals.

Thefirmwareisexecutedina48-bit,signed,fixed-pointarithmeticmachine.Themostsignificantbitofthe

48-bitdatapathisasignbit,andthe47lowerbitsaredatabits.Mixergainoperationsareimplemented

bymultiplyinga48-bit,signeddatavaluebya28-bit,signedgaincoefficient.The76-bit,signedoutput

productisthentruncatedtoasigned,48-bitnumber.Leveloffsetoperationsareimplementedbyaddinga

48-bit,signedoffsetcoefficienttoa48-bit,signeddatavalue.Inmostcases,iftheadditionresultsin

overflowingthe48-bit,signednumberformat,saturationlogicisused.Thismeansthatifthesummation

resultsinapositivenumberthatisgreaterthan0x7FFFFFFFFFFF(thespacesareusedtoeasethe

readingofthehexadecimalnumber),thenumberissetto0x7FFFFFFFFFFF.Ifthesummationresultsin

anegativenumberthatislessthan0x800000000000,thenumberissetto0x800000000000.

Allmixergaincoefficientsare28-bitcoefficientsusinga5.23numberformat.Numbersformattedas5.23

numbershave5bitstotheleftofthebinarypointand23bitstotherightofthebinarypoint.Thisisshown

inFigure2-4.

SubmitDocumentationFeedbackDescription23

Not Recommended For New Designs

−23

Bit

S_xxxx.xxxx_xxxx_xxxx_xxxx_xxxx_xxx

−4

Bit

−1

Bit

Sign Bit

Bit

M0007-01

(1 or 0) y 2

+ (1 or 0) y 2

+ … + (1 or 0) y 2

+ (1 or 0) y 2

−1

+ … + (1 or 0) y 2

−4

+ … + (1 or 0) y 2

−23

Bit 2

−1

Bit 2

−4

Bit 2

−23

Bit

M0008-01

Coefficient

Digit 8

u u u S x x x

Coefficient

Digit 7

x. x x x

Coefficient

Digit 6

x x x x

Coefficient

Digit 5

x x x x

Coefficient

Digit 4

x x x x

Coefficient

Digit 3

x x x x

Coefficient

Digit 2

x x x x

Coefficient

Digit 1

Fraction

Digit 5

Sign

Bit

Fraction

Digit 6

Fraction

Digit 4

Fraction

Digit 3

Fraction

Digit 2

Fraction

Digit 1

Integer

Digit 1

u = unused or don’t care bits

Digit = hexadecimal digit

M0009-01

TAS5518C

8-ChannelDigitalAudioPWMProcessor

SLES238A–SEPTEMBER2008–REVISEDJULY2009

www.ti.com

Figure2-4.5.23Format

Thedecimalvalueofa5.23formatnumbercanbefoundbyfollowingtheweightingshowninFigure2-5.If

themostsignificantbitislogic0,thenumberisapositivenumber,andtheweightingshownyieldsthe

correctnumber.Ifthemostsignificantbitisalogic1,thenthenumberisanegativenumber.Inthiscase,

everybitmustbeinverted,a1addedtotheresult,andthentheweightingshowninFigure2-5appliedto

obtainthemagnitudeofthenegativenumber.

Figure2-5.ConversionWeightingFactors—5.23FormattoFloatingPoint

Gaincoefficients,enteredviatheI

Cbus,mustbeenteredas32-bitbinarynumbers.Theformatofthe

32-bitnumber(4-byteor8-digithexadecimalnumber)isshowninFigure2-6.

Figure2-6.Alignmentof5.23Coefficientin32-BitI

CWord

AsFigure2-6shows,thehexadecimal(hex)valueoftheintegerpartofthegaincoefficientcannotbe

Description 24SubmitDocumentationFeedback

Not Recommended For New Designs

Part #	TAS5518CPAG
Description	8 CHANNEL DIGITAL AUDIO PWM PROCESSOR
Category	IC
Availability	In Stock
Qty	2

TAS5518CPAG

Related Items

Technical Document