Linear Technology LTC2430 Manual page 6

W U
TI I G CHARACTERISTICS
range, otherwise specifications are at T
SYMBOL PARAMETER
f External Oscillator Frequency Range
EOSC
t External Oscillator High Period
HEO
t External Oscillator Low Period
LEO
t Conversion Time
CONV
f Internal SCK Frequency
ISCK
D Internal SCK Duty Cycle
ISCK
f External SCK Frequency Range
ESCK
t External SCK Low Period
LESCK
t External SCK High Period
HESCK
t Internal SCK 24-Bit Data Output Time
DOUT_ISCK
t External SCK 24-Bit Data Output Time (Note 9)
DOUT_ESCK
CS ↓ to SDO Low Z
t
1
CS ↑ to SDO High Z
t
2
CS ↓ to SCK ↓
t
3
CS ↓ to SCK ↑
t
4
SCK ↓ to SDO Valid
t
KQMAX
SDO Hold After SCK ↓
t
KQMIN
SCK Set-Up Before CS ↓
t
5
SCK Hold After CS ↓
t
6
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 = 2.7V to 5.5V unless otherwise specified.
CC
+ –
V = REF – REF , V = (REF
REF REFCM
+ – +
V = IN – IN , V = (IN + IN
IN INCM
Note 4: F pin tied to GND or to V
O
source with f = 153600Hz unless otherwise specified.
EOSC
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 = 0V (internal oscillator) or f
O
(external oscillator).
Note 8: F = V (internal oscillator) or f
O CC
(external oscillator).
The denotes specifications which apply over the full operating temperature
= 25°C. (Note 3)
A
CONDITIONS
F = 0V
O
F = V
O CC
External Oscillator (Note 11)
Internal Oscillator (Note 10)
External Oscillator (Notes 10, 11)
(Note 10)
(Note 9)
(Note 9)
(Note 9)
Internal Oscillator (Notes 10, 12)
External Oscillator (Notes 10, 11)
(Note 10)
(Note 9)
(Note 5)
+ –
+ REF )/2;
–
)/2.
or to external conversion clock
CC
= 153600Hz ±2%
EOSC
= 128000Hz ±2%
EOSC
LTC2430/LTC2431
MIN
0.25
0.25
130.86
157.03
45
250
250
1.22
50
15
50
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
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
Note 11: The external oscillator is connected to the F
oscillator frequency, f , is expressed in kHz.
EOSC
Note 12: The converter uses the internal oscillator.
F = 0V or F = V .
O O CC
Note 13: The output noise includes the contribution of the internal
calibration operations.
Note 14: Guaranteed by design and test correlation.
TYP MAX
5 2000
200
200
133.53 136.20
160.23 163.44
20510/f (in kHz)
EOSC
19.2
f /8
EOSC
55
2000
1.25 1.28
192/f (in kHz)
EOSC
24/f (in kHz)
ESCK
0 200
0 200
0 200
220
50
and is expressed in kHz.
ESCK
= 20pF.
LOAD
pin. The external
O
UNITS
kHz
µs
µs
ms
ms
ms
kHz
kHz
%
kHz
ns
ns
ms
ms
ms
ns
ns
ns
ns
ns
ns
ns
ns
24301f
5