LTC2492 Linear Technology, LTC2492 Datasheet - Page 5

• Manufacturer Part Number: LTC2492
• Description: 24-Bit 2-/4-Channel ADC
• Manufacturer: Linear Technology

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DIGITAL INPUTS AND DIGITAL OUTPUTS
full operating temperature range, otherwise specifi cations are at T
SYMBOL
f
t
t
t
t
f
D
f
t
t
t
t
t
t
t
t
t
t
t
t
t
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: Unless otherwise specifi ed:
where IN
Note 4: Use internal conversion clock or external conversion clock source
with f
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
oscillator).
Note 8: 60Hz mode (internal oscillator) or f
oscillator).
EOSC
HEO
LEO
CONV_1
CONV_2
ISCK
ESCK
LESCK
HESCK
DOUT_ISCK
DOUT_ESCK
1
2
3
4
KQMAX
KQMIN
5
7
8
ISCK
V
V
V
CC
REFCM
IN
EOSC
= IN
= 2.7V to 5.5V
+
and IN
= 307.2kHz unless other wise specifi ed.
= V
+
– IN
PARAMETER
External Oscillator Frequency Range
External Oscillator High Period
External Oscillator Low Period
Conversion Time for 1x Speed Mode
Conversion Time for 2x Speed Mode
Internal SCK Frequency
Internal SCK Duty Cycle
External SCK Frequency Range
External SCK Low Period
External SCK High Period
Internal SCK 32-Bit Data Output Time
External SCK 32-Bit Data Output Time
CS↓ to SDO Low
CS↑ to SDO Hi-Z
CS↓ to SCK↓
CS↓ to SCK↑
SCK↓ to SDO Valid
SDO Hold After SCK↓
SCK Set-Up Before CS↓
SDI Setup Before SCK↑
SDI Hold After SCK↑
REF
–
–
/2, F
, V
are the selected input channels.
IN(CM)
S
= 0.5V
= (IN
REF
+
– IN
–
)/2,
EOSC
EOSC
= 256kHz ±2% (external
= 307.2kHz ±2% (external
CONDITIONS
(Note 16)
50Hz Mode
60Hz Mode
Simultaneous 50/60Hz Mode
External Oscillator
50Hz Mode
60Hz Mode
Simultaneous 50/60Hz Mode
External Oscillator
Internal Oscillator (Notes 10, 17)
External Oscillator (Notes 10, 11, 15)
(Notes 10, 17)
(Notes 10, 11, 15)
(Notes 10, 11, 15)
(Notes 10, 11, 15)
Internal Oscillator (Notes 10, 17)
External Oscillator (Notes 10, 11, 15)
(Notes 10, 11, 15)
Internal SCK Mode
External SCK Mode
(Note 5)
(Note 5)
(Note 5)
A
= 25°C. (Note 3)
Note 9: Simultaneous 50Hz/60Hz mode (internal oscillator) or f
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 a digital input and the
driving clock is f
digital output and the output clock signal during the data output is f
Note 11: The external oscillator is connected to the F
oscillator frequency, f
Note 12: The converter uses its 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: The converter is in external SCK mode of operation such that the
SCK pin is used as a digital input. The frequency of the clock signal driving
SCK during the data output is f
Note 16: Refer to Applications Information section for performance vs
data rate graphs.
Note 17: The converter in internal SCK mode of operation such that the
SCK pin is used as a digital output.
The
●
ESCK
denotes the specifi cations which apply over the
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
. In the internal SCK mode, the SCK pin is used as a
EOSC
0.125
0.125
157.2
144.1
MIN
78.7
65.6
72.2
0.81
131
125
125
100
100
10
45
50
15
50
, is expressed in kHz.
0
0
0
ESCK
41036/f
20556/f
256/f
32/f
and is expressed in Hz.
ESCK
EOSC
f
160.3
133.6
146.9
EOSC
EOSC
EOSC
80.3
66.9
73.6
38.4
0.83
TYP
(in kHz)
(in kHz)
/8
(in kHz)
(in kHz)
LTC2492
O
pin. The external
163.5
136.3
149.9
4000
4000
MAX
81.9
68.2
75.1
0.85
100
100
200
200
200
200
55
EOSC
ISCK
UNITS
=
2492fb
5
kHz
kHz
kHz
kHz
.
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
μs
μs
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
%