Rainbow Electronics ADC12138 - Manual (Page 7)

AC Electrical Characteristics
The following specifications apply for (V a e V
A
a e V
D
a e a 5V V
REF
a e a 4 096V and fully-differential input with fixed
2 048V common-mode voltage) or (V a e V A a e V D a e a 3 3V V REF a e a 2 5V and fully-differential input with fixed
1 250V common-mode voltage) V REF b e 0V 12-bit a sign conversion mode source impedance for analog inputs V REF b
and V
REF
a s 25X f
CK e f
SK e 5 MHz 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
Typical Limits Units
(Note 10) (Note 11) (Limits)
f CK Conversion Clock 10 5 MHz (max)
(CCLK) Frequency 1 MHz (min)
f
SK
Serial Data Clock 10 5 MHz (max)
SCLK Frequency 0 Hz (min)
Conversion Clock 40 % (min)
Duty Cycle 60 % (max)
Serial Data Clock 40 % (min)
Duty Cycle 60 % (max)
t
C
Conversion Time 12-Bit a Sign or 12-Bit 44(t
CK
) 44(t
CK
) (max)
8 8 m s (max)
t A Acquisition Time 6 Cycles Programmed 6(t CK ) 6(t CK ) (min)
(Note 19) 7(t
CK
) (max)
1 2 m s (min)
1 4 m s (max)
10 Cycles Programmed 10(t CK ) 10(t CK ) (min)
11(t
CK
) (max)
2 0 m s (min)
2 2 m s (max)
18 Cycles Programmed 18(t
CK
) 18(t
CK
) (min)
19(t
CK
) (max)
3 6 m s (min)
3 8 m s (max)
34 Cycles Programmed 34(t
CK
) 34(t
CK
) (min)
35(t CK ) (max)
6 8 m s (min)
7 0 m s (max)
t
CAL
Self-Calibration Time 4944(t
CK
) 4944(t
CK
) (max)
988 8 m s (max)
t AZ Auto-Zero Time 76(t CK ) 76(t CK ) (max)
15 2 m s (max)
t SYNC Self-Calibration or 2(t CK ) 2(t CK ) (min)
Auto-Zero Synchronization 3(t CK ) (max)
Time from DOR
0 40 m s (min)
0 60 m s (max)
t DOR DOR High Time when CS is Low 9(t SK ) 9(t SK ) (max)
Continuously for Read Data and Software
1 8 m s (max)
Power Up Down
t
CONV
CONV Valid Data Time 8(t
SK
) 8(t
SK
) (max)
1 6 m s (max)
7