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

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

4

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ELECTRICAL CHARACTERISTICS (continued)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

POWER REQUIREMENTS

MAX1237/MAX1239

2.7

3.6

Supply Voltage

MAX1236/MAX1238

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

±0.2

LSB/V

TIMING CHARACTERISTICS (Figure 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

TIMING CHARACTERISTICS FOR FAST MODE

Serial-Clock Frequency

400

kHz

Bus Free Time Between a STOP (P)

and a START (S) Condition

1.3

µs

Hold Time for START (S) Condition

0.6

µs

Low Period of the SCL Clock

1.3

µs

High Period of the SCL Clock

0.6

µs

Setup Time for a Repeated START

Condition (Sr)

0.6

µs

Data Hold Time (Note 10)

0

900

ns

Data Setup Time

100

ns

Rise Time of Both SDA and SCL

Signals, Receiving

300

ns

Fall Time of SDA Transmitting

300

ns

Setup Time for STOP (P) Condition

0.6

µs

Capacitive Load for Each Bus Line

400

pF

Pulse Width of Spike Suppressed

50

ns