LTC2440
4
2440fe
For more information www.linear.com/LTC2440
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POWER REQUIREMENTS
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
= 4.5 to 5.5V unless otherwise specified.
V
REF
= REF
+
– REF
–
, V
REFCM
= (REF
+
+ REF
–
)/2;
V
IN
= IN
+
– IN
–
, V
INCM
= (IN
+
+ IN
–
)/2.
Note 4: f
O
pin tied to GND or to external conversion clock source with
f
EOSC
= 10MHz 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.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Supply Voltage
l
4.5 5.5 V
I
CC
Supply Current
Conversion Mode
Sleep Mode
CS = 0V (Note 7)
CS = V
CC
(Note 7)
l
l
8
8
11
30
mA
µA
The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 3)
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 7: The converter uses the internal oscillator.
Note 8: 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
ESCK
and is expressed in Hz.
Note 9: The converter is in internal SCK mode of operation such that the
SCK pin is used as a digital output. In this mode of operation, the SCK pin
has a total equivalent load capacitance of C
LOAD
= 20pF.
Note 10: The external oscillator is connected to the f
O
pin. The external
oscillator frequency, f
EOSC
, is expressed in kHz.
Note 11: The converter uses the internal oscillator. f
O
= 0V.
Note 12: Guaranteed by design and test correlation.
Note 13: There is an internal reset that adds an additional 5 to 15 f
O
cycles
to the conversion time.
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SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
f
EOSC
External Oscillator Frequency Range
l
0.1 12 MHz
t
HEO
External Oscillator High Period
l
25 10000 ns
t
LEO
External Oscillator Low Period
l
25 10000 ns
t
CONV
Conversion Time OSR = 256 (SDI = 0)
OSR = 32768 (SDI = 1)
External Oscillator (Note 10, 13)
l
l
l
0.99
126
1.13
145
40 • OSR + 178
f
EOSC
(kHz)
1.33
170
ms
ms
ms
f
ISCK
Internal SCK Frequency Internal Oscillator (Note 9)
External Oscillator (Notes 9, 10)
l
0.8 0.9
f
EOSC
/10
1 MHz
Hz
D
ISCK
Internal SCK Duty Cycle (Note 9)
l
45 55 %
f
ESCK
External SCK Frequency Range (Note 8)
l
20 MHz
t
LESCK
External SCK Low Period (Note 8)
l
25 ns
t
HESCK
External SCK High Period (Note 8)
l
25 ns
t
DOUT_ISCK
Internal SCK 32-Bit Data Output Time Internal Oscillator (Notes 9, 11)
External Oscillator (Notes 9, 10)
l
30.9 35.3
320/f
EOSC
41.6 µs
s
t
DOUT_ESCK
External SCK 32-Bit Data Output Time (Note 8)
l
32/f
ESCK
s
t
1
CS to SDO Low Z (Note 12)
l
0 25 ns
t
2
CS ↑ to SDO High Z
(Note 12)
l
0 25 ns
t
3
CS to SCK (Note 9)
l
5 µs
t
4
CS to SCK ↑
(Notes 8, 12)
l
25 ns
t
KQMAX
SCK to SDO Valid
l
25 ns
t
KQMIN
SDO Hold After SCK (Note 5)
l
15 ns
t
5
SCK Set-Up Before CS
l
50 ns
t
7
SDI Setup Before SCK ↑
(Note 5)
l
10 ns
t
8
SDI Hold After SCK ↑
(Note 5)
l
10 ns
