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AD6644AST-65 Fiches technique(PDF) 4 Page - Analog Devices

No de pièce AD6644AST-65
Description  14-Bit, 40 MSPS/65 MSPS A/D Converter
Download  19 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD6644AST-65 Fiches technique(HTML) 4 Page - Analog Devices

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


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