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8.5TimingCharacteristics
8.5.1MasterClockSignals(TAS3108/TAS3108IA)
XTALI
MCLKO
MCLKI
t
w(MCLKI)
t
f(MCLKO)
t
c(1)
t
c(2)
t
c(3)
t
w(MCLKO)
t
r(MCLKO)
t
d(MI-MO)
T0088-01
TAS3108,TAS3108IA
AUDIODIGITALSIGNALPROCESSORS
SLES152B–OCTOBER2005–REVISEDNOVEMBER2007
ThefollowingsectionsdescribethetimingcharacteristicsoftheTAS3108/TAS3108IA.
overrecommendedoperatingconditions(unlessotherwisenoted)
TEST
PARAMETERMINTYPMAXUNIT
CONDITIONS
f
(XTALI)
Frequency,XTALI(1/t
c(1)
)See
(1)
6
(2)
20
(2)
MHz
t
c(1)
Cycletime,XTALI50
(2)
166
(2)
ns
f
(MCLKI)
Frequency,MCLKI(1/t
c(2)
)6
(2)
25MHz
t
w(MCLKI)
Pulseduration,MCLKIhighSee
(3)
0.4t
c(2)
0.5t
c(2)
0.6t
c(2)
ns
MCLKIjitter±5
(2)
ns
f
(MCLKO)
Frequency,MCLKO(1/t
c(3)
)6
(2)
25
(2)
MHz
t
r(MCLKO)
Risetime,MCLKOC
L
=30pF15
(2)
ns
t
f(MCLKO)
Falltime,MCLKOC
L
=30pF15
(2)
ns
t
w(MCLKO)
Pulseduration,MCLKOhighSee
(4)
H
MCLKO
ns
XTALImasterclocksource80
MCLKOjitterps
MCLKImasterclocksourceSee
(5)
Delaytime,MCLKIrisingMCLKO=MCLKISee
(6)
20
(2)
t
d(MI-MO)
edgetoMCLKOrisingns
MCLKO<MCLKISee
(6)(7)
20
(2)
edge
(1)Dutycycleis50/50.
(2)Thismeasurementisspecifiedbydesign.
(3)PeriodofMCLKI=T
MCLKI
=1/f
MCLKI
(4)H
MCLKO
=1/(2×MCLKO).MCLKOhasthesamedutycycleasMCLKIwhenMCLKO=MCLKI.WhenMCLKO=0.5MCLKIor0.25
MCLKI,thedutycycleofMCLKOistypically50%.
(5)WhenMCLKOisderivedfromMCLKI,MCLKOjitter=MCLKIjitter
(6)OnlyapplieswhenMCLKIisselectedasmastersourceclock
(7)AlsoappliestoMCLKOfallingedgewhenMCLKO=MCLKI/2orMCLKI/4.
Figure8-1.MasterClockSignalTimingWaveforms
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