AD6644
AC SPECIFICATIONS
1
(AV
Parameter
SNR
Analog Input
@ –1 dBFS
SINAD
2
Analog Input
@ –1 dBFS
2.2 MHz
15.5 MHz
30.5 MHz
2.2 MHz
15.5 MHz
30.5 MHz
CC
= 5 V, DV
CC
= 3.3 V; ENCODE and
ENCODE
= Maximum Conversion Rate MSPS; T
MIN
= –25 C, T
MAX
= +85 C)
Temp
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
Full
Full
25°C
Test
Level
II
II
II
II
II
V
II
II
V
II
II
V
V
V
V
AD6644AST-40
Min
Typ
Max
74.5
74.0
73.5
74.5
74.0
73.0
92
90
85
93
92
92
100
90
250
AD6644AST-65
Min
Typ
Max
72
72
72
72
72
74.5
74.0
73.5
74.5
74.0
73.0
92
90
85
93
92
92
100
90
250
Unit
dB
dB
dB
dB
dB
dB
dBc
dBc
dBc
dBc
dBc
dBc
dBFS
dBc
MHz
WORST HARMONIC (2
ND
or 3
RD
)
2
Analog Input
2.2 MHz
@ –1 dBFS
15.5 MHz
30.5 MHz
WORST HARMONIC (4
TH
or Higher)
2
Analog Input
2.2 MHz
@ –1 dBFS
15.5 MHz
30.5 MHz
TWO-TONE SFDR
2, 3, 4
TWO-TONE IMD REJECTION
2, 4
F1, F2 @ –7 dBFS
ANALOG INPUT BANDWIDTH
83
83
85
85
NOTES
1
All ac specifications tested by driving ENCODE and
ENCODE
differentially.
2
AV
CC
= 5 V to 5.25 V for rated ac performance.
3
Analog input signal power swept from –7 dBFS to –100 dBFS.
4
F1 = 15 MHz, F2 = 15.5 MHz.
Specifications subject to change without notice.
SWITCHING SPECIFICATIONS
Parameter
ENCODE INPUT PARAMETERS
Encode Period
1
@ 65 MSPS
Encode Period
1
@ 40 MSPS
Encode Pulsewidth High
2
@ 65 MSPS
Encode Pulsewidth Low @ 65 MSPS
ENCODE/DATA READY
Encode Rising to Data Ready Falling
Encode Rising to Data Ready Rising
@ 65 MSPS (50% Duty Cycle)
@ 40 MSPS (50% Duty Cycle)
ENCODE/DATA (D13:0), OVR
ENC to DATA Falling Low
ENC to DATA Rising Low
ENCODE to DATA Delay (Hold Time)
3
ENCODE to DATA Delay (Setup Time)
4
Encode = 65 MSPS (50% Duty Cycle)
Encode = 40 MSPS (50% Duty Cycle)
1
(AV
CC
= 5 V, DV
CC
= 3.3 V; ENCODE and
ENCODE
= Maximum Conversion Rate MSPS; T
MIN
=
–25 C, T
MAX
= +85 C, C
LOAD
= 10 pF)
Name
t
ENC
t
ENC
t
ENCH
t
ENCL
t
DR
t
E_DR
Temp
Full
Full
Full
Full
Full
Full
Full
t
E_FL
t
E_RL
t
H_E
t
S_E
Full
Full
Full
Full
Full
Test
Level
V
V
IV
IV
IV
IV
IV
IV
IV
IV
IV
IV
Min
AD6644AST-40/65
Typ
Max
15.4
25
7.7
7.7
3.4
t
ENCH
+ t
DR
11.1
15.9
5.5
4.3
4.3
t
ENC
– t
E_FL
9.8
19.4
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
6.2
6.2
2.6
10.3
15.1
3.8
3.0
3.0
6.2
15.9
9.2
9.2
4.6
12.3
17.1
9.2
6.4
6.4
11.6
21.2
REV. 0
–3–
AD [ ANALOG DEVICES ]
