LTC2430/LTC2431
5
24301f
Note 1: Absolute Maximum Ratings are those values beyond which the
life of the device may be impaired.
Note 2: All voltage values are with respect to GND.
Note 3: V
CC
= 2.7V to 5.5V unless otherwise specified.
V
REF
= REF
+
โ REF
โ
, V
REFCM
= (REF
+
+ REF
โ
)/2;
V
IN
= IN
+
โ IN
โ
, V
INCM
= (IN
+
+ IN
โ
)/2.
Note 4: F
O
pin tied to GND or to V
CC
or to external conversion clock
source with f
EOSC
= 153600Hz unless otherwise specified.
Note 5: Guaranteed by design, not subject to test.
Note 6: Integral nonlinearity is defined as the deviation of a code from
a straight line passing through the actual endpoints of the transfer
curve. The deviation is calculated as the measured code minus the
expected value.
Note 7: F
O
= 0V (internal oscillator) or f
EOSC
= 153600Hz ยฑ2%
(external oscillator).
Note 8: F
O
= V
CC
(internal oscillator) or f
EOSC
= 128000Hz ยฑ2%
(external oscillator).
Note 9: The converter is in external SCK mode of operation such that
the SCK pin is used as digital input. The frequency of the clock signal
driving SCK during the data output is f
ESCK
and is expressed in kHz.
Note 10: The converter is in internal SCK mode of operation such that
the SCK pin is used as digital output. In this mode of operation the
SCK pin has a total equivalent load capacitance C
LOAD
= 20pF.
Note 11: The external oscillator is connected to the F
O
pin. The external
oscillator frequency, f
EOSC
, is expressed in kHz.
Note 12: The converter uses the internal oscillator.
F
O
= 0V or F
O
= V
CC
.
Note 13: The output noise includes the contribution of the internal
calibration operations.
Note 14: Guaranteed by design and test correlation.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
f
EOSC
External Oscillator Frequency Range โ 5 2000 kHz
t
HEO
External Oscillator High Period โ 0.25 200 ยตs
t
LEO
External Oscillator Low Period โ 0.25 200 ยตs
t
CONV
Conversion Time F
O
= 0V โ 130.86 133.53 136.20 ms
F
O
= V
CC
โ 157.03 160.23 163.44 ms
External Oscillator (Note 11)
โ 20510/f
EOSC
(in kHz) ms
f
ISCK
Internal SCK Frequency Internal Oscillator (Note 10) 19.2 kHz
External Oscillator (Notes 10, 11) f
EOSC
/8 kHz
D
ISCK
Internal SCK Duty Cycle (Note 10) โ 45 55 %
f
ESCK
External SCK Frequency Range (Note 9) โ 2000 kHz
t
LESCK
External SCK Low Period (Note 9) โ 250 ns
t
HESCK
External SCK High Period (Note 9) โ 250 ns
t
DOUT_ISCK
Internal SCK 24-Bit Data Output Time Internal Oscillator (Notes 10, 12) โ 1.22 1.25 1.28 ms
External Oscillator (Notes 10, 11)
โ 192/f
EOSC
(in kHz) ms
t
DOUT_ESCK
External SCK 24-Bit Data Output Time (Note 9) โ 24/f
ESCK
(in kHz) ms
t
1
CS โ to SDO Low Z โ 0 200 ns
t
2
CS โ to SDO High Z โ 0 200 ns
t
3
CS โ to SCK โ (Note 10) โ 0 200 ns
t
4
CS โ to SCK โ (Note 9) โ 50 ns
t
KQMAX
SCK โ to SDO Valid โ 220 ns
t
KQMIN
SDO Hold After SCK โ (Note 5) โ 15 ns
t
5
SCK Set-Up Before CS โ โ 50 ns
t
6
SCK Hold After CS โ โ 50 ns
The โ denotes specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25ยฐC. (Note 3)
TI I G CHARACTERISTICS
UW
