Datasheet

AD6645
Rev. D | Page 6 of 24
Test
AD6645ASQ-80/
AD6645ASV-80
AD6645ASQ-105/
AD6645ASV-105
Parameter Symbol Temp Level Min Typ Max Min Typ Max Unit
DATA-READY (DRY
4
)/DATA(D13:0),, OVR
Data-Ready to DATA Delay (Hold Time) t
H_DR
Full V Note 5
5
Note 5
5
50% Duty Cycle Full V 6.6 7.2 7.9 5.1 5.7 6.4 ns
Data-Ready to DATA Delay (Setup Time) t
S_DR
Full V Note 5
5
Note 5
5
50% Duty Cycle Full V 2.1 3.6 5.1 0.6 2.1 3.5 ns
APERTURE DELAY t
A
25°C V −500 −500 ps
APERTURE UNCERTAINTY (JITTER) t
J
25°C V 0.1 0.1 ps rms
1
Several timing parameters are a function of t
ENC
and t
ENCH
.
2
Several timing parameters are a function of t
ENCL
and t
ENCH
.
3
ENCODE TO DATA Delay (Hold Time) is the absolute minimum propagation delay through the ADC, t
E_RL
= t
H_E
.
4
DRY is an inverted and delayed version of the encode clock. Any change in the duty cycle of the clock will correspondingly change the duty cycle of DRY.
5
Data-ready to DATA Delay (t
H_DR
and t
S_DR
) is calculated relative to rated speed grade and is dependent on t
ENC
and duty cycle.
t
S_DR
t
A
AIN
N
N + 1
N + 2
N + 3
N + 4
t
ENC
t
ENCH
t
ENCL
t
E_FL
t
E_RL
t
E_DR
t
S_E
t
H_E
t
DR
t
H_DR
NN – 1N – 3
D[13:0], OVR
DRY
N + 4N + 3N + 2N + 1N
ENCODE,
ENCODE
N – 2
2647-002
0
Figure 2. Timing Diagram