Ac electrical characteristics – Rainbow Electronics ADC12038 User Manual
Page 7
AC Electrical Characteristics
The following specifications apply for V
a
e
V
A
a
e
V
D
a
e a
5 0 V
DC
V
REF
a
e a
4 096 V
DC
V
REF
b
e
0 V
DC
12-bit a
sign conversion mode t
r
e
t
f
e
3 ns f
CK
e
f
SK
e
8 MHz for the ADC12H030 ADC12H032 ADC12H034 and ADC12H038
f
CK
e
f
SK
e
5 MHz for the ADC12030 ADC12032 ADC12034 and ADC12038 R
S
e
25X source impedance for V
REF
a
and
V
REF
b
s
25X fully-differential input with fixed 2 048V common-mode voltage and 10(t
CK
) acquisition time unless otherwise
specified Boldface limits apply for T
A
e
T
J
e
T
MIN
to T
MAX
all other limits T
A
e
T
J
e
25 C (Note 17)
Symbol
Parameter
Conditions
(Note 10)
Typical
ADC12H030 2 4 8
ADC12030 2 4 8
(Limits)
Units
Limits
Limits
(Note 11)
(Note 11)
f
CK
Conversion Clock
10
8
5
MHz (max)
(CCLK) Frequency
1
MHz (min)
f
SK
Serial Data Clock
10
8
5
MHz (max)
SCLK Frequency
0
Hz (min)
Conversion Clock
40
40
% (min)
Duty Cycle
60
60
% (max)
Serial Data Clock
40
40
% (min)
Duty Cycle
60
60
% (max)
t
C
Conversion Time
12-Bit a Sign or 12-Bit
44(t
CK
)
44(t
CK
)
44(t
CK
)
(max)
5 5
8 8
m
s (max)
8-Bit a Sign or 8-Bit
21(t
CK
)
21(t
CK
)
21(t
CK
)
(max)
2 625
4 2
m
s (max)
t
A
Acquisition Time
6 Cycles Programmed
6(t
CK
)
6(t
CK
)
6(t
CK
)
(min)
(Note 19)
7(t
CK
)
7(t
CK
)
(max)
0 75
1 2
m
s (min)
0 875
1 4
m
s (max)
10 Cycles Programmed
10(t
CK
)
10(t
CK
)
10(t
CK
)
(min)
11(t
CK
)
11(t
CK
)
(max)
1 25
2 0
m
s (min)
1 375
2 2
m
s (max)
18 Cycles Programmed
18(t
CK
)
18(t
CK
)
18(t
CK
)
(min)
19(t
CK
)
19(t
CK
)
(max)
2 25
3 6
m
s (min)
2 375
3 8
m
s (max)
34 Cycles Programmed
34(t
CK
)
34(t
CK
)
34(t
CK
)
(min)
35(t
CK
)
35(t
CK
)
(max)
4 25
6 8
m
s (min)
4 375
7 0
m
s (max)
t
CKAL
Self-Calibration Time
4944(t
CK
)
4944(t
CK
)
4944(t
CK
)
(max)
618 0
988 8
m
s (max)
t
AZ
Auto-Zero Time
76(t
CK
)
76(t
CK
)
76(t
CK
)
(max)
9 5
15 2
m
s (max)
t
SYNC
Self-Calibration or
2(t
CK
)
2(t
CK
)
2(t
CK
)
(min)
Auto-Zero Synchronization
3(t
CK
)
3(t
CK
)
(max)
Time from DOR
0 250
0 40
m
s (min)
0 375
0 60
m
s (max)
t
DOR
DOR High Time
9(t
SK
)
9(t
SK
)
9(t
SK
)
(max)
when CS is Low
1 125
1 8
m
s (max)
Continuously for Read
Data and Software
Power Up Down
t
CONV
CONV Valid Data Time
8(t
SK
)
8(t
SK
)
8(t
SK
)
(max)
1 0
1 6
m
s (max)
7