Rainbow Electronics MAX1495 - Manual (Page 6)

MAX1491/MAX1493/MAX1495
3.5- and 4.5-Digit, Single-Chip
ADCs with LCD Drivers
6 _______________________________________________________________________________________
INTERNAL REFERENCE VOLTAGE
vs. TEMPERATURE
MAX1491/3/5 toc07
TEMPERATURE ( °C)
REFERENCE VOLTAGE (V)
60 50 40 30 20 10
2.046
2.045
2.047
2.049
2.048
2.051
2.050
2.053
2.052
2.054
2.044
0 70
INTERNAL REFERENCE VOLTAGE
vs. ANALOG SUPPLY VOLTAGE
MAX1491/3/5 toc08
SUPPLY VOLTAGE (V)
REFERENCE VOLTAGE (V)
4.75 4.25 3.75 3.25
2.045
2.046
2.047
2.048
2.049
2.050
2.044
2.75 5.25
SUPPLY CURRENT
vs. TEMPERATURE
MAX1491/3/5 toc09
TEMPERATURE ( °C)
SUPPLY CURRENT (
µ
A)
60 50 40 30 20 10
100
200
300
400
500
600
700
0
0 70
ANALOG SUPPLY
DIGITAL SUPPLY
CHARGE-PUMP OUTPUT VOLTAGE
vs. ANALOG SUPPLY VOLTAGE
MAX1491/3/5 toc10
SUPPLY VOLTAGE (V)
V
NEG
VOLTAGE (V)
4.75 4.25 3.75 3.25
-2.48
-2.46
-2.44
-2.42
-2.40
-2.50
2.75 5.25
V NEG STARTUP SCOPE SHOT
MAX1491/3/5 toc11
20ms/div
2V/div
1V/div
V DD
V NEG
C NEG = 0.1 µF
OFFSET ERROR
vs. COMMON-MODE VOLTAGE
MAX1491/3/5 toc12
COMMON-MODE VOLTAGE (V)
OFFSET ERROR (COUNTS)
1.5 1.0 -1.5 -1.0 -0.5 0 0.5
-0.15
-0.10
-0.05
0
0.05
0.10
0.15
0.20
-0.20
-2.0 2.0
Typical Operating Characteristics (continued)
(AV DD = DV DD = 5V, GND = 0, REF+ = 2.048V, REF- = GND, RANGE = DV DD , T A = +25°C.)