Datasheet

LTC2480
6
2480fd
TiMing characTerisTics
The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 3)
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All voltage values are with respect to GND.
Note 3: V
CC
= 2.7V to 5.5V unless otherwise specified.
V
REFCM
= V
REF
/2, FS = 0.5V
REF
/GAIN
V
IN
= IN
+
– IN
–
, V
IN(CM)
= (IN
+
+ IN
–
)/2
Note 4: Use internal conversion clock or external conversion clock source
with f
EOSC
= 307.2kHz 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 measured from the center of the quantization band.
Note 7: 50Hz mode (internal oscillator) or f
EOSC
= 256kHz ±2% (external
oscillator).
Note 8: 60Hz mode (internal oscillator) or f
EOSC
= 307.2kHz ±2% (external
oscillator).
Note 9: Simultaneous 50Hz/60Hz mode (internal oscillator) or f
EOSC
=
280kHz ±2% (external oscillator).
Note 10: The SCK can be configured in external SCK mode or internal SCK
mode. In external SCK mode, the SCK pin is used as digital input and the
driving clock is f
ESCK
. In internal SCK mode, the SCK pin is used as digital
output and the output clock signal during the data output is f
ISCK
.
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.
Note 13: The output noise includes the contribution of the internal
calibration operations.
Note 14: Guaranteed by design and test correlation.
Note 15: Refer to Applications Information section for performance vs
data rate graphs.
Note 16: For V
CC
< 3V, V
IH
is 2.5V for pin f
O
.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t
LESCK
External SCK Low Period (Note 10)
l
125 ns
t
HESCK
External SCK High Period (Note 10)
l
125 ns
t
DOUT_ISCK
Internal SCK 24-Bit Data Output Time Internal Oscillator (Notes 10, 12)
l
0.61 0.625 0.64 ms
External Oscillator (Notes 10, 11)
l
192/f
EOSC
(in kHz) ms
t
DOUT_ESCK
External SCK 24-Bit Data Output Time (Note 10)
l
24/f
ESCK
(in kHz) ms
t
1
CS↓ to SDO Low
l
0 200 ns
t
2
CS↑ to SDO High Z
l
0 200 ns
t
3
CS↓ to SCK↓
Internal SCK Mode
l
0 200 ns
t
4
CS↓ to SCK↑
External SCK Mode
l
50 ns
t
KQMAX
SCK↓ to SDO Valid
l
200 ns
t
KQMIN
SDO Hold After SCK↓
(Note 5)
l
15 ns
t
5
SCK Set-Up Before CS↓
l
50 ns
t
6
SCK Hold After CS↓
l
50 ns
t
7
SDI Setup Before SCK↑
(Note 5)
l
100 ns
t
8
SDI Hold After SCK↑
(Note 5)
l
100 ns