AD6644PCB AD [Analog Devices], AD6644PCB Datasheet - Page 4

• Manufacturer Part Number: AD6644PCB
• Description: 14-Bit, 40 MSPS/65 MSPS A/D Converter
• Manufacturer: AD [Analog Devices]

AD6644–SPECIFICATIONS
Parameter
DATA READY (DRY
APERTURE DELAY
APERTURE UNCERTAINTY (JITTER)
NOTES
1
2
3
4
5
6
Specifications subject to change without notice.
Several timing parameters are a function of t
To compensate for a change in duty cycle for t
ENCODE to DATA Delay (Hold Time) is the absolute minimum propagation delay through the analog-to-digital converter.
ENCODE to DATA Delay (Setup Time) is calculated relative to 65 MSPS (50% duty cycle). In order to calculate t
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.
Data Ready to DATA Delay(t
Newt
Newt
Newt
and t
Newt
Newt
Data Ready to DATA Delay (Hold Time)
Data Ready to DATA Delay (Setup Time)
@ 65 MSPS (50% Duty Cycle)
@ 40 MSPS (50% Duty Cycle)
Encode = 65 MSPS (50% Duty Cycle)
Encode = 40 MSPS (50% Duty Cycle)
H_DR
S_DR
S_E
H_DR
S_DR
S_DR
= t
D[13:0], OVR
= (t
= (t
for a given encode use the following equations:
= t
= t
ENC(NEW)
ENC, ENC
ENC(NEW)
S_DR
ENC(NEW)
H_DR
DRY
AIN
– % Change(t
– % Change(t
– t
/2 – t
/2 – t
ENC
5
t
)/DATA, OVR
ENCH
A
ENCH
+ t
t
E_RL
N
t
S_E
E_FL
H_DR
ENCH
+ t
ENCH
+ t
N
(i.e., for 40 MSPS: Newt
H_DR
S_DR
and t
)) × t
)) × t
t
ENC
(i.e., for 40 MSPS: Newt
(i.e., for 40 MSPS: Newt
S_DR
ENC
ENC
/2.
) is calculated relative to 65 MSPS (50% duty cycle) and is dependent on t
ENC
/2
H_DR
and t
N–3
2
2
and t
ENCH
S_DR
N 1
S_E(TYP)
t
.
Name
t
t
t
t
N 1
ENCH
H_DR
S_DR
A
J
use the following equation:
H_DR(TYP)
S_DR(TYP)
Figure 1. Timing Diagram
= 25 × 10
= 12.5 × 10
t
= 12.5 × 10
ENCL
Temp
25°C
25°C
Full
Full
Full
Full
–9
N–2
– 15.38 × 10
–4–
t
DR
–9
–9
N 2
– 7.69 × 10
– 7.69 × 10
N 2
t
E_DR
–9
Test
Level
IV
IV
IV
IV
V
V
+ 9.8 × 10
t
S_DR
–9
–9
+ 5.5 × 10
+ 8.6 × 10
–9
= 19.4 × 10
N–1
t
Min
8.0
3.2
8.0
12.8
H_DR
–9
–9
= 10.3 × 10
= 13.4 × 10
N 3
N 3
S_E
–9
ENC
AD6644AST-40/65
).
for a given encode use the following equation:
and duty cycle. In order to calculate t
–9
–9
Typ
Note 6
8.6
13.4
Note 6
5.5
10.3
100
0.2
.
t
S_E
N
N 4
Max
9.4
14.2
6.5
11.3
t
H_E
N 4
Unit
ns
ns
ns
ns
ps
ps rms
REV. 0
H_DR