Datasheet

LTC2484
5
2484fd
TIMING CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating temperature
range, otherwise specifi cations are at T
A
= 25°C. (Note 3)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
f
EOSC
External Oscillator Frequency Range (Note 15)
l
10 4000 kHz
t
HEO
External Oscillator High Period
l
0.125 100 μs
t
LEO
External Oscillator Low Period
l
0.125 100 μs
t
CONV_1
Conversion Time for 1x Speed Mode 50Hz Mode
60Hz Mode
Simultaneous 50Hz/60Hz Mode
l
l
l
157.2
131.0
144.1
160.3
133.6
146.9
163.5
136.3
149.9
ms
ms
ms
External Oscillator
l
41036/f
EOSC
(in kHz) ms
t
CONV_2
Conversion Time for 2x Speed Mode 50Hz Mode
60Hz Mode
Simultaneous 50Hz/60Hz Mode
l
l
l
78.7
65.6
72.2
80.3
66.9
73.6
81.9
68.2
75.1
ms
ms
ms
External Oscillator
l
20556/f
EOSC
(in kHz) ms
f
ISCK
Internal SCK Frequency Internal Oscillator (Note 10)
External Oscillator (Notes 10, 11)
38.4
f
EOSC
/8
kHz
kHz
D
ISCK
Internal SCK Duty Cycle (Note 10)
l
45 55 %
f
ESCK
External SCK Frequency Range (Note 10)
l
4000 kHz
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 32-Bit Data Output Time Internal Oscillator (Notes 10, 12)
l
0.81 0.83 0.85 ms
External Oscillator (Notes 10, 11)
l
256/f
EOSC
(in kHz) ms
t
DOUT_ESCK
External SCK 32-Bit Data Output Time (Note 10)
l
32/f
ESCK
(in kHz) ms
t
1
CS↓ to SDO Low
l
0200ns
t
2
CS↑ to SDO Hi-Z
l
0200ns
t
3
CS↓ to SCK↓
(Note 10)
l
0200ns
t4
CS↓ to SCK↑
(Note 10)
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
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 specifi ed.
V
REFCM
= V
REF
/2, FS = 0.5V
REF
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 specifi ed.
Note 5: Guaranteed by design, not subject to test.
Note 6: Integral nonlinearity is defi ned 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 confi gured 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
.