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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3

ELECTRICAL CHARACTERISTICS (continued)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Internal clock, SCAN[1:0] = 01

51

Internal clock, SCAN[1:0] = 00

CS[3:0] = 1011 (MAX1238/MAX1239)

51

Throughput Rate

External clock

94.4

ksps

Track/Hold Acquisition Time

800

ns

Internal Clock Frequency

2.8

MHz

External clock, fast mode

60

Aperture Delay (Note 5)

External clock, high-speed mode

30

ns

ANALOG INPUT (AIN0–AIN11)

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)

MAX1237/MAX1239

1.968

2.048

2.128

Reference Voltage

MAX1236/MAX1238

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