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

1-/2-Channel, 2-Wire Serial, 12-Bit ADCs

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3

ELECTRICAL CHARACTERISTICS (continued)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

ANALOG INPUT (AIN0/AIN1)

Unipolar

0

Input Voltage Range, Single-

Ended and Differential (Note 6)

Bipolar

0

V

Input Multiplexer Leakage Current

±0.01

±1µA

Input Capacitance

22

pF

INTERNAL REFERENCE (Note 7)

MAX11645

1.968

2.048

2.128

Reference Voltage

MAX11644

3.936

4.096

4.256

V

Reference-Voltage Temperature

Coefficient

25

ppm/

°C

REF Short-Circuit Current

2mA

REF Source Impedance

1.5

k

Ω

EXTERNAL REFERENCE

REF Input Voltage Range

(Note 8)

1

V

REF Input Current

40

µA

DIGITAL INPUTS/OUTPUTS (SCL, SDA)

Input-High Voltage

V

Input-Low Voltage

V

Input Hysteresis

V

Input Current

±10

µA

Input Capacitance

15

pF

Output Low Voltage

0.4

V

POWER REQUIREMENTS

MAX11645

2.7

3.6

Supply Voltage

MAX11644

4.5

5.5

V

Internal reference

900

1150

external clock

External reference

670

900

Internal reference

530

internal clock

External reference

230

Internal reference

380

internal clock

External reference

60

Internal reference

330

internal clock

External reference

6

Supply Current

Shutdown (internal REF off)

0.5

10

µA

Power-Supply Rejection Ratio

PSRR

Full-scale input (Note 9)

±0.5

±2.0

LSB/V