Datasheet

MAX1236–MAX1239
2.7V to 3.6V and 4.5V to 5.5V, Low-Power,
4-/12-Channel, 2-Wire Serial, 12-Bit ADCs
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200
300
250
350
400
450
500
550
600
650
700
750
800
0 2030406080100
AVERAGE SUPPLY CURRENT vs.
CONVERSION RATE (EXTERNAL CLOCK)
MAX1236 toc07
CONVERSION RATE (ksps)
AVERAGE I
DD
(μA)
010 50 70 90
A
B
A) INTERNAL REFERENCE ALWAYS ON
B) EXTERNAL REFERENCE
MAX1238
0.9990
0.9994
0.9992
0.9998
0.9996
1.0002
1.0000
1.0004
1.0008
1.0006
1.0010
-40 -10 5-25 20 35 50 65 80
INTERNAL REFERENCE VOLTAGE
vs. TEMPERATURE
MAX1236 toc08
TEMPERATURE (°C)
V
REF
NORMALIZED
NORMALIZED TO VALUE AT +25°C
MAX1238
MAX1239
0.99990
0.99994
0.99992
0.99998
0.99996
1.00002
1.00000
1.00004
1.00008
1.00006
1.00010
2.7 3.3 3.6 3.93.0 4.2 4.5 4.8 5.1 5.4
NORMALIZED REFERENCE VOLTAGE
vs. SUPPLY VOLTAGE
MAX1236 toc09
V
DD
(V)
V
REF
(V)
MAX1236/MAX1238
NORMALIZED TO
REFERENCE VALUE AT
V
DD
= 5V
MAX1237/MAX1239
NORMALIZED TO
REFERENCE VALUE AT
V
DD
= 3.3V
Typical Operating Characteristics (continued)
(V
DD
= 3.3V (MAX1237/MAX1239), V
DD
= 5V (MAX1236/MAX1238), f
SCL
= 1.7MHz, (50% duty cycle), f
SAMPLE
= 94.4ksps, single-
ended, unipolar, T
A
= +25°C, unless otherwise noted.)
OFFSET ERROR vs. TEMPERATURE
MAX1236 toc10
TEMPERATURE (°C)
OFFSET ERROR (LSB)
806535 50-10 5 20-25
-0.9
-0.8
-0.7
-0.6
-0.5
-0.4
-0.3
-0.2
-0.1
0
-1.0
-40
OFFSET ERROR vs. SUPPLY VOLTAGE
MAX1236 toc11
V
DD
(V)
OFFSET ERROR (LSB)
5.2 5.54.74.23.73.2
-1.6
-1.2
-0.8
-0.4
0
0.4
0.8
1.2
1.6
2.0
-2.0
2.7
GAIN ERROR vs. TEMPERATURE
MAX1236 toc12
TEMPERATURE (°C)
GAIN ERROR (LSB)
806535 50-10 5 20-25
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0
-40
GAIN ERROR vs. SUPPLY VOLTAGE
MAX1236 toc13
V
DD
(V)
GAIN ERROR (LSB)
5.2 5.54.74.23.73.2
-1.6
-1.2
-0.8
-0.4
0
0.4
0.8
1.2
1.6
2.0
-2.0
2.7