Datasheet

MAX1497/MAX1499
3.5- and 4.5-Digit, Single-Chip ADCs with LED
Drivers and µC Interface
_______________________________________________________________________________________ 9
Typical Operating Characteristics (continued)
(AV
DD
= DV
DD
= V
DD
= +2.7V to +5.25V, V
LED
= +2.7V to +5.25V, GND = 0, GLED = 0, external reference mode, REF+ = 2.048V,
REF- = GND, C
REF+
= C
REF-
= 0.1µF, RANGE bit = 1, internal clock mode, C
VNEG
= 0.1µF. T
A
= +25°C, unless otherwise noted.)
DATA OUTPUT RATE
vs. SUPPLY VOLTAGE
MAX1497/99 toc19
SUPPLY VOLTAGE (V)
DATA OUTPUT RATE (Hz)
4.744.233.21 3.72
4.995
4.990
4.985
5.000
5.005
5.010
5.015
5.020
4.980
2.70 5.25
OFFSET ERROR
vs. COMMON-MODE VOLTAGE
MAX1497/99 toc20
COMMON-MODE VOLTAGE (V)
OFFSET ERROR (LSB)
1.51.0-1.5 -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
SEGMENT CURRENT
vs. SUPPLY VOLTAGE
MAX1497/99 toc23
SUPPLY VOLTAGE (V)
SEGMENT CURRENT (µA)
4.744.233.723.21
5
10
15
20
25
30
0
2.70 5.25
R
ISET
= 25kΩ
V
NEG
STARTUP SCOPE SHOT
MAX1497/99 toc21
20ms/div
2V/div
1V/div
V
DD
V
NEG
CHARGE-PUMP OUTPUT VOLTAGE
vs. ANALOG SUPPLY VOLTAGE
MAX1497/99 toc22
SUPPLY VOLTAGE (V)
V
NEG
VOLTAGE (V)
4.754.253.753.25
-2.48
-2.46
-2.44
-2.42
-2.40
-2.50
2.75 5.25