MAX1237 datasheet(6/22 Pages) MAXIM

6 / 22 page

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

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

_______________________________________________________________________________________

Typical Operating Characteristics

(VDD = 3.3V (MAX1237/MAX1239), VDD = 5V (MAX1236/MAX1238), fSCL = 1.7MHz, (50% duty cycle), fSAMPLE = 94.4ksps, single-

ended, unipolar, TA = +25°C, unless otherwise noted.)

-0.5

-0.2

-0.4

-0.3

0.2

0.1

0.3

0.5

4000

DIFFERENTIAL NONLINEARITY

vs. DIGITAL CODE

DIGITAL OUTPUT CODE

1000 1500

500

2000 2500 3000 3500

0.4

-1.0

-0.4

-0.6

-0.8

-0.2

0.2

0.4

0.6

0.8

1.0

INTEGRAL NONLINEARITY

vs. DIGITAL CODE

DIGITAL OUTPUT CODE

4000

1000 1500

500

2000 2500 3000 3500

-180

-160

-140

-120

-100

-80

-60

10k

20k

30k

40k

50k

FFT PLOT

FREQUENCY (Hz)

fSAMPLE = 94.4ksps

fIN = 10kHz

300

400

350

500

450

600

550

650

750

700

800

-40

-10

-25

SUPPLY CURRENT vs. TEMPERATURE

(MAX1238/MAX1239)

TEMPERATURE (

°C)

INTERNAL REFERENCE MAX1239/MAX1237

INTERNAL REFERENCE MAX1238/MAX1236

EXTERNAL REFERENCE MAX1238/MAX1236

EXTERNAL REFERENCE MAX1239/MAX1237

SETUP BYTE

EXT REF: 10111011

INT REF: 11011011

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

SDA = SCL = VDD

0.10

0.05

0.20

0.15

0.30

0.25

0.35

0.45

0.40

0.50

-40

-10

-25

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE (

°C)

MAX1238

MAX1239

and for the MAX1236/MAX1238 where N is the number of bits and VREF.

Note 10: A master device must provide a data hold time for SDA (referred to VIL of SCL) in order to bridge the undefined region of

SCL’s falling edge (see Figure 1).

Note 11: CB = total capacitance of one bus line in pF.

Note 12: fSCL must meet the minimum clock low time plus the rise/fall times.

REF

)

( .

)

−

[] ×













TIMING CHARACTERISTICS (Figure 1) (continued)

(VDD = 2.7V to 3.6V (MAX1237/MAX1239), VDD = 4.5V to 5.5V (MAX1236/MAX1238), VREF = 2.048V (MAX1237/MAX1239), VREF =

4.096V (MAX1236/MAX1238), CREF = 0.1µF, fSCL = 1.7MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at

TA = +25°C, see Tables 1–5 for programming notation.)

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