LTC2440 Linear Technology, LTC2440 Datasheet - Page 4

• Manufacturer Part Number: LTC2440
• Description: 24-Bit High Speed Differential delta-sigma ADC
• Manufacturer: Linear Technology

POWER REQUIRE E TS
LTC2440
TI I G CHARACTERISTICS
range, otherwise specifications are at T
SYMBOL
f
t
t
t
f
D
f
t
t
t
t
t
t
t
t
t
t
t
t
t
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
V
V
Note 4: F
f
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.
otherwise specifications are at T
SYMBOL
V
I
4
EOSC
HEO
LEO
CONV
ISCK
ESCK
LESCK
HESCK
DOUT_ISCK
DOUT_ESCK
1
2
3
4
KQMAX
KQMIN
5
7
8
EOSC
CC
CC
REF
IN
ISCK
W U
= IN
= REF
= 10MHz unless otherwise specified.
+
O
CC
– IN
pin tied to GND or to external conversion clock source with
+
= 4.5 to 5.5V unless otherwise specified.
– REF
–
, V
PARAMETER
External Oscillator Frequency Range
External Oscillator High Period
External Oscillator Low Period
Conversion Time
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 Z
CS ↑ to SDO High 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 ↑
INCM
PARAMETER
Supply Voltage
Supply Current
–
, V
Conversion Mode
Sleep Mode
REFCM
= (IN
+
= (REF
+ IN
–
)/2.
+
+ REF
A
W U
= 25°C. (Note 3)
–
)/2;
A
= 25°C. (Note 3)
The
●
The
CONDITIONS
OSR = 256 (SDI = 0)
OSR = 32768 (SDI = 1)
External Oscillator (Note 10, 13)
Internal Oscillator (Note 9)
External Oscillator (Notes 9, 10)
(Note 9)
(Note 8)
(Note 8)
(Note 8)
Internal Oscillator (Notes 9, 11)
External Oscillator (Notes 9, 10)
(Note 8)
(Note 12)
(Note 12)
(Note 9)
(Notes 8, 12)
(Note 5)
CONDITIONS
CS = 0V (Note 7)
CS = V
denotes specifications which apply over the full operating temperature range,
●
CC
denotes specifications which apply over the full operating temperature
(Note 7)
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
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
Note 10: The external oscillator is connected to the F
oscillator frequency, f
Note 11: The converter uses the internal oscillator. F
Note 12: Guaranteed by design and test correlation.
Note 13: There is an internal reset that adds an additional 1µs (typical) to
the conversion time.
EOSC
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
, is expressed in kHz.
ESCK
0.99
41.6
MIN
MIN
126
0.1
0.8
4.5
25
25
45
25
25
25
15
50
10
10
0
0
and is expressed in Hz.
40 • OSR + 170
f
EOSC
320/f
f
32/f
LOAD
EOSC
Note 5
Note 5
1.13
35.3
TYP
TYP
145
0.9
5
8
8
ESCK
(kHz)
EOSC
/10
= 20pF.
O
O
= 0V.
pin. The external
10000
10000
MAX
MAX
1.33
30.9
170
5.5
11
30
20
55
20
25
25
25
1
sn2440, 2440fas
UNITS
UNITS
MHz
MHz
MHz
mA
ms
ms
ms
µA
ns
ns
Hz
ns
ns
µs
ns
ns
µs
ns
ns
ns
ns
ns
ns
%
V
s
s