2.7V to 3.6V and 4.5V to 5.5V, Low-Power,

4-/12-Channel, 2-Wire Serial 10-Bit ADCs

6

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Typical Operating Characteristics

-0.3

-0.1

-0.2

0.1

0

0.2

0.3

0

1000

DIFFERENTIAL NONLINEARITY

vs. DIGITAL CODE

DIGITAL OUTPUT CODE

400

200

600

800

-0.5

-0.2

-0.3

-0.4

-0.1

0

0.1

0.2

0.3

0.4

0.5

0

400

200

600

800

1000

INTEGRAL NONLINEARITY

vs. DIGITAL CODE

DIGITAL OUTPUT CODE

-160

-140

-120

-100

-80

-60

-40

-20

0

0

10k

20k

30k

40k

50k

FFT PLOT

FREQUENCY (Hz)

300

400

350

500

450

600

550

650

750

700

800

-40

-10

5

-25

20

35

50

65

80

SUPPLY CURRENT vs. TEMPERATURE

TEMPERATURE (

°C)

INTERNAL REFERENCE

MAX1138/1136

MAX1139/1137

MAX1138/1136

MAX1139/1137

INTERNAL REFERENCE

EXTERNAL REFERENCE

EXTERNAL REFERENCE

SETUP BYTE

EXT REF: 10111011

INT REF: 11011011

0

0.2

0.1

0.4

0.3

0.5

0.6

2.7

5.2

SHUTDOWN SUPPLY CURRENT

vs. SUPPLY VOLTAGE

INPUT VOLTAGE (V)

3.7

3.2

4.2

4.7

0

0.10

0.05

0.20

0.15

0.30

0.25

0.35

0.45

0.40

0.50

-40

-10

5

-25

20

35

50

65

80

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE (

°C)

MAX1138

MAX1139

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

MAX1138

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)

MAX1138

MAX1139

NORMALIZED TO REFERENCE VALUE

AT +25

°C

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

MAX1138/MAX1136,

NORMALIZED TO

REFERENCE VALUE AT

MAX1139/MAX1137,

NORMALIZED TO

REFERENCE VALUE AT