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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: VCC = 2.7V to 5.5V unless otherwise specified.
VREF = REF
+ – REF–, VREFCM = (REF+ + REF–)/2;
VIN = IN+ – IN–, VINCM = (IN+ + IN–)/2.
Note 4: FO pin tied to GND or to VCC or to external conversion clock
source with fEOSC = 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: FO = 0V (internal oscillator) or fEOSC = 153600Hz ±2%
(external oscillator).
Note 8: FO = VCC (internal oscillator) or fEOSC = 128000Hz ±2%
(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 fESCK 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 CLOAD = 20pF.
Note 11: The external oscillator is connected to the FO pin. The external
oscillator frequency, fEOSC, is expressed in kHz.
Note 12: The converter uses the internal oscillator.
FO = 0V or FO = VCC.
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
fEOSC
External Oscillator Frequency Range
q
5
2000
kHz
tHEO
External Oscillator High Period
q
0.25
200
s
tLEO
External Oscillator Low Period
q
0.25
200
s
tCONV
Conversion Time
FO = 0V
q
130.86
133.53
136.20
ms
FO = VCC
q
157.03
160.23
163.44
ms
External Oscillator (Note 11)
q
20510/fEOSC (in kHz)
ms
fISCK
Internal SCK Frequency
Internal Oscillator (Note 10)
19.2
kHz
External Oscillator (Notes 10, 11)
fEOSC/8
kHz
DISCK
Internal SCK Duty Cycle
(Note 10)
q
45
55
%
fESCK
External SCK Frequency Range
(Note 9)
q
2000
kHz
tLESCK
External SCK Low Period
(Note 9)
q
250
ns
tHESCK
External SCK High Period
(Note 9)
q
250
ns
tDOUT_ISCK
Internal SCK 24-Bit Data Output Time
Internal Oscillator (Notes 10, 12)
q
1.22
1.25
1.28
ms
External Oscillator (Notes 10, 11)
q
192/fEOSC (in kHz)
ms
tDOUT_ESCK
External SCK 24-Bit Data Output Time
(Note 9)
q
24/fESCK (in kHz)
ms
t1
CS
↓ to SDO Low Z
q
0
200
ns
t2
CS
↑ to SDO High Z
q
0
200
ns
t3
CS
↓ to SCK ↓
(Note 10)
q
0
200
ns
t4
CS
↓ to SCK ↑
(Note 9)
q
50
ns
tKQMAX
SCK
↓ to SDO Valid
q
220
ns
tKQMIN
SDO Hold After SCK
↓
(Note 5)
q
15
ns
t5
SCK Set-Up Before CS
↓
q
50
ns
t6
SCK Hold After CS
↓
q
50
ns
The q denotes specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. (Note 3)
TI I G CHARACTERISTICS
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