Rainbow Electronics MAX1494 - Manual (Page 7)

MAX1492/MAX1494
3.5- and 4.5-Digit, Single-Chip ADCs
with LCD Drivers
_______________________________________________________________________________________ 7
INTERNAL REFERENCE VOLTAGE
vs. ANALOG SUPPLY VOLTAGE
MAX1492/94 toc10
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
MAX1492/94 toc11
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
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX1492/94 toc12
TEMPERATURE ( °C)
SUPPLY CURRENT (
µ
A)
60 50 40 30 20 10
50
100
150
200
250
300
0
0 70
ANALOG SUPPLY
DIGITAL SUPPLY
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX1492/94 toc13
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
µ
A)
4.75 4.25 3.75 3.25
50
100
150
200
250
300
0
2.75 5.25
ANALOG SUPPLY
DIGITAL SUPPLY
CHARGE-PUMP OUTPUT VOLTAGE
vs. ANALOG SUPPLY VOLTAGE
MAX1492/94 toc14
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
MAX1492/94 toc15
20ms/div
2V/div
1V/div
V DD
V NEG
OFFSET ERROR
vs. COMMON-MODE VOLTAGE
MAX1492/94 toc16
COMMON-MODE VOLTAGE (V)
OFFSET ERROR (LSB)
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
DATA OUTPUT RATE
vs. TEMPERATURE
MAX1492/94 toc17
TEMPERATURE ( °C)
DATA OUTPUT RATE (Hz)
60 35 -15 10
4.92
4.98
4.96
4.94
5.00
5.02
5.04
5.06
5.08
5.10
4.90
-40 85
DATA OUTPUT RATE
vs. SUPPLY VOLTAGE
MAX1492/94 toc18
SUPPLY VOLTAGE (V)
DATA OUTPUT RATE (Hz)
4.74 4.23 3.21 3.72
4.995
4.990
4.985
5.000
5.005
5.010
5.015
5.020
4.980
2.70 5.25
Typical Operating Characteristics (continued)
(AV
DD
= DV
DD
= 5V, GND = 0, external reference mode, REF+ = 2.048V, REF- = GND, RANGE bit = 1, internal clock mode, T
A
=
+25°C, unless otherwise noted.)