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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7

200

300

250

350

400

450

500

550

600

650

700

750

800

0

20 30 40

60

80

100

AVERAGE SUPPLY CURRENT vs.

CONVERSION RATE (EXTERNAL CLOCK)

CONVERSION RATE (ksps)

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

TEMPERATURE (

°C)

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 3.9

3.0

4.2 4.5 4.8 5.1 5.4

NORMALIZED REFERENCE VOLTAGE

vs. SUPPLY VOLTAGE

MAX1236/MAX1238

NORMALIZED TO

REFERENCE VALUE AT

MAX1237/MAX1239

NORMALIZED TO

REFERENCE VALUE AT

Typical Operating Characteristics (continued)

OFFSET ERROR vs. TEMPERATURE

TEMPERATURE (

°C)

80

65

35

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

5.2 5.5

4.7

4.2

3.7

3.2

-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

TEMPERATURE (

°C)

80

65

35

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

5.2 5.5

4.7

4.2

3.7

3.2

-1.6

-1.2

-0.8

-0.4

0

0.4

0.8

1.2

1.6

2.0

-2.0

2.7