Datasheet

Table 30. Input clock jitter spec parameter
Parameter Symbol
-25
Units Notes
Min. Max.
Clock period jitter
t
JIT (
per) -100 100 ps 33
Clock period jitter during DLL locking
period
t
JIT
(per,lck) -80 80 ps 33
Cycle to cycle clock period jitter
t
JIT
(cc) -200 200 ps 33
Cycle to cycle clock period jitter
during DLL locking period
t
JIT
(cc,lck) -160 160 ps 33
Cumulative error across 2 cycles
t
ERR
(2per) -150 150 ps 33
Cumulative error across 3 cycles
t
ERR
(3per) -175 175 ps 33
Cumulative error across 4 cycles
t
ERR
(4per) -200 200 ps 33
Cumulative error across 5 cycles
t
ERR
(5per) -200 200 ps 33
Cumulative error across n cycles,
n=6...10, inclusive
t
ERR
(6-
10per)
-300 300 ps 33
Cumulative error across n cycles,
n=11...50, inclusive
t
ERR
(11-
50per)
-450 450 ps 33
Duty cycle jitter
t
JIT
(duty) -100 100 ps 33
Definitio
ns:
- t
CK
(avg)
t
CK
(avg) is calculated as the average clock period across any consecutive 200 cycle window.
( )
=
⎡⎤
=
⎢⎥
⎣⎦
∑
j
CK CK
1
/N
tt
N
j
avg
where N=200
- t
CH
(avg) and t
CL
(avg)
t
CH
(avg) is defined as the average HIGH pulse width, as calculated across any consecutive 200 HIGH pulses.
( ) ( )
( )
=
⎡⎤
=×
⎢⎥
⎣⎦
∑
j
CH CH CK
1
/
ttt
N
j
avg N avg
where N=200
t
CL
(avg) is defined as the average LOW pulse width, as calculated across any consecutive 200 LOW pulses.
( ) ( )
( )
=
⎡⎤
=×
⎢⎥
⎣⎦
∑
j
CL CL CK
1
/
ttt
N
j
avg N avg
where N=200
t
JIT
(duty) is defined as the cumulative set of t
CH
jitter and t
CL
jitter. t
CH
jitter is the largest deviation of any single t
CH
from t
CH
(avg). t
CL
jitter is the largest deviation of any single t
CL
from t
CL
(avg).
- t
JIT
(duty) = Min/max of {t
JIT
(CH), t
JIT
(CL)}
where,
t
JIT
(CH) = {t
CHi
- t
CH
(avg) where i=1 to 200}
t
JIT
(CL) = {t
CLi
- t
CL
(avg) where i=1 to 200}
AS4C128M16D2A-25BCN
AS4C128M16D2A-25BIN
Confidential
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Rev.1.0 Dec 2015