
AC Electrical Characteristics
The following specifications apply for V
a
e
V
A
a
e
V
D
a
ea
5.0 V
DC
,V
REF
a
ea
4.096 V
DC
,V
REF
b
e
0V
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 85MHz (max)
(CCLK) Frequency 1 MHz (min)
f
SK
Serial Data Clock 10 85MHz (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 ms (max)
8-Bit
a
Sign or 8-Bit 21(t
CK
) 21(t
CK
) 21(t
CK
) (max)
2.625 4.2 ms (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 ms (min)
0.875 1.4 ms (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 ms (min)
1.375 2.2 ms (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 ms (min)
2.375 3.8 ms (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 ms (min)
4.375 7.0 ms (max)
t
CKAL
Self-Calibration Time 4944(t
CK
) 4944(t
CK
) 4944(t
CK
) (max)
618.0 988.8 ms (max)
t
AZ
Auto-Zero Time 76(t
CK
) 76(t
CK
) 76(t
CK
) (max)
9.5 15.2 ms (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 ms (min)
0.375 0.60 ms (max)
t
DOR
DOR High Time 9(t
SK
) 9(t
SK
) 9(t
SK
) (max)
when CS is Low
1.125 1.8 ms (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 ms (max)
7
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