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