+2.7V to +5.25V, Low-Power, 8-Channel,

Serial 10-Bit ADCs

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3

Multiplexer Leakage Current

µA

0.01

10

Shutdown VREF Input Current

k

Ω

18

25

VREF Input Resistance

µA

100

150

VREF Input Current

V

1.0

50mV

VREF Input Voltage Range

(Note 9)

pF

16

Input Capacitance

1.8

MHz

0.225

Internal Clock Frequency

µA

±0.01

±1

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

SHDN = FLOAT

VREF = 2.500V

CONDITIONS

ELECTRICAL CHARACTERISTICS (continued)

otherwise noted.)

V

2.470

2.500

2.530

VREF Output Voltage

mA

30

VREF Short-Circuit Current

±30

MAX149

mV

0.35

Load Regulation (Note 8)

0mA to 0.2mA output load

0

Internal compensation mode

µF

4.7

Capacitive Bypass at VREF

External compensation mode

µF

0.01

Capacitive Bypass at REFADJ

%

±1.5

REFADJ Adjustment Range

V

0.5

REFADJ Buffer-Disable Threshold

µF

0

Capacitive Bypass at VREF

Internal compensation mode

2.00

V/V

2.06

Reference Buffer Gain

4.7

MAX148

MAX149

External compensation mode

±10

µA

±50

REFADJ Input Current

MAX148

MAX149

ppm/°C

VREF Temperature Coefficient

0 to VREF

V

±VREF / 2

Input Voltage Range, Single-

Ended and Differential (Note 6)

Unipolar, COM = 0V

Bipolar, COM = VREF / 2

0.1

2.0

MHz

0

2.0

External Clock Frequency

Data transfer only

CONVERSION RATE (continued)

ANALOG/COM INPUTS

INTERNAL REFERENCE (MAX149 only, reference buffer enabled)

EXTERNAL REFERENCE AT VREF (Buffer disabled)

EXTERNAL REFERENCE AT REFADJ