Datasheet

LTC2446/LTC2447
3
24467fa
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Resolution (No Missing Codes) 0.1V ≤ V
REF
≤ V
CC
, –0.5 • V
REF
≤ V
IN
≤ 0.5 • V
REF
, (Note 5) ● 24 Bits
Integral Nonlinearity V
CC
= 5V, REF
+
= 5V, REF
–
= GND, V
INCM
= 2.5V, (Note 6) ● 5 15 ppm of V
REF
REF
+
= 2.5V, REF
–
= GND, V
INCM
= 1.25V, (Note 6) 3 ppm of V
REF
Offset Error 2.5V ≤ REF
+
≤ V
CC
, REF
–
= GND, ● 2.5 5 µV
GND ≤ IN
+
= IN
–
≤ V
CC
(Note 12)
Offset Error Drift 2.5V ≤ REF
+
≤ V
CC
, REF
–
= GND, 20 nV/°C
GND ≤ IN
+
= IN
–
≤ V
CC
Positive Full-Scale Error REF
+
= 5V, REF
–
= GND, IN
+
= 3.75V, IN
–
= 1.25V ● 10 50 ppm of V
REF
REF
+
= 2.5V, REF
–
= GND, IN
+
= 1.875V, IN
–
= 0.625V ● 10 50 ppm of V
REF
Positive Full-Scale Error Drift 2.5V ≤ REF
+
≤ V
CC
, REF
–
= GND, 0.2 ppm of V
REF
/°C
IN
+
= 0.75REF
+
, IN
–
= 0.25 • REF
+
Negative Full-Scale Error REF
+
= 5V, REF
–
= GND, IN
+
= 1.25V, IN
–
= 3.75V ● 10 50 ppm of V
REF
REF
+
= 2.5V, REF
–
= GND, IN
+
= 0.625V, IN
–
= 1.875V ● 10 50 ppm of V
REF
Negative Full-Scale Error Drift 2.5V ≤ REF
+
≤ V
CC
, REF
–
= GND, 0.2 ppm of V
REF
/°C
IN
+
= 0.25 • REF
+
, IN
–
= 0.75 • REF
+
Total Unadjusted Error 5V ≤ V
CC
≤ 5.5V, REF
+
= 2.5V, REF
–
= GND, V
INCM
= 1.25V 15 ppm of V
REF
5V ≤ V
CC
≤ 5.5V, REF
+
= 5V, REF
–
= GND, V
INCM
= 2.5V 15 ppm of V
REF
REF
+
= 2.5V, REF
–
= GND, V
INCM
= 1.25V, (Note 6) 15 ppm of V
REF
Input Common Mode Rejection DC 2.5V ≤ REF
+
≤ V
CC
, REF
–
= GND, 120 dB
GND ≤ IN
–
= IN
+
≤ V
CC
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Notes 3, 4)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IN
+
Absolute/Common Mode IN
+
Voltage ● GND – 0.3V V
CC
+ 0.3V V
IN
–
Absolute/Common Mode IN
–
Voltage ● GND – 0.3V V
CC
+ 0.3V V
V
IN
Input Differential Voltage Range ● –V
REF
/2 V
REF
/2 V
(IN
+
– IN
–
)
REF
+
Absolute/Common Mode REF
+
Voltage ● 0.1 V
CC
V
REF
–
Absolute/Common Mode REF
–
Voltage ● GND V
CC
– 0.1V V
V
REF
Reference Differential Voltage Range ● 0.1 V
CC
V
(REF
+
– REF
–
)
C
S(IN+)
IN
+
Sampling Capacitance 2 pF
C
S(IN–)
IN
–
Sampling Capacitance 2 pF
C
S(REF+)
REF
+
Sampling Capacitance 2 pF
C
S(REF–)
REF
–
Sampling Capacitance 2 pF
I
DC_LEAK(IN+, IN–,
Leakage Current, Inputs and Reference CS = V
CC
, IN
+
= GND, IN
–
= GND, ● –15 1 15 nA
REF+, REF–)
REF
+
= 5V, REF
–
= GND
I
SAMPLE(IN+, IN–,
Average Input/Reference Current Varies, See Applications Section nA
REF+, REF–)
During Sampling
t
OPEN
MUX Break-Before-Make 50 ns
QIRR MUX Off Isolation V
IN
= 2V
P-P
DC to 1.8MHz 120 dB
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
A ALOG I PUT A
U
D REFERE CE
UUU