LTC2439-1 Linear Technology, LTC2439-1 Datasheet - Page 5

• Manufacturer Part Number: LTC2439-1
• Description: 8-/16-Channel 16-Bit No Latency Delta-Sigma ADC
• Manufacturer: Linear Technology

TI I G CHARACTERISTICS
range, otherwise specifications are at T
SYMBOL
f
t
t
t
f
D
f
t
t
t
t
t
t2
t3
t4
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
and negative input respectively.
Note 4: F
source with f
Note 5: Guaranteed by design, not subject to test.
Note 6: Integral nonlinearity is defined as the deviation of a code from
a precise analog input voltage. Maximum specifications are limited by
the LSB step size (V
specifications are measured from the center of the quantization band.
Note 7: F
(external oscillator).
EOSC
HEO
LEO
CONV
ISCK
ESCK
LESCK
HESCK
DOUT_ISCK
DOUT_ESCK
1
KQMAX
KQMIN
t
t
7
8
5
6
REF
INCM
ISCK
W
= REF
= (IN
O
O
U
CC
+
pin tied to GND or to V
= GND (internal oscillator) or f
+
= 2.7V to 5.5V unless otherwise specified.
– REF
EOSC
+ IN
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 19-Bit Data Output Time
External SCK 19-Bit Data Output Time (Note 7)
CS to SDO Low
CS to SDO High Z
CS to SCK
CS to SCK
SCK
SDO Hold After SCK
SCK Set-Up Before CS
SCK Hold After CS
SDI Setup Before SCK
SDI Hold After SCK
–
= 153600Hz unless otherwise specified.
)/2, IN
–
, V
REF
to SDO Valid
REFCM
/2
+
16
and IN
) and the single shot measurement. Typical
= (REF
–
CC
are defined as the selected positive
+
or to external conversion clock
+ REF
EOSC
A
–
)/2; V
= 25 C. (Note 3)
= 139800Hz 2%
IN
CONDITIONS
F
External Oscillator (Note 10)
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 9)
(Note 8)
(Note 5)
(Note 5)
(Note 5)
= IN
O
= 0V
+
The
– IN
–
,
denotes specifications which apply over the full operating temperature
Note 8: The converter is in external SCK mode of operation such that
the SCK pin is used as 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 digital output. In this mode of operation the
SCK pin has a total equivalent load capacitance 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: 1 V RMS noise is independent of V
performance is limited by the quantization, lowering V
effective resolution.
Note 13: Guaranteed by design and test correlation.
Note 14: The low sleep mode current is valid only when CS is high.
Note 15: These parameters are guaranteed by design over the full
supply and temperature range. Automated testing proceedures are
limited by the LSB Step Size (V
O
= 0V or F
O
= V
CC
.
EOSC
, is expressed in kHz.
143.8
2.56
0.25
0.25
1.06
MIN
250
250
100
100
45
50
15
50
0
0
0
REF
20510/f
/2
152/f
19/f
16
ESCK
).
ESCK
EOSC
f
146.7
EOSC
EOSC
17.5
1.09
TYP
and is expressed in kHz.
LTC2439-1
REF
(in kHz)
(in kHz)
/8
(in kHz)
. Since the noise
LOAD
O
149.6
2000
2000
MAX
1.11
REF
390
390
200
200
200
220
= 20pF.
pin. The external
55
50
improves the
UNITS
24391f
5
kHz
kHz
kHz
kHz
ms
ms
ms
ms
ms
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
%
s
s