MAX148BCPP+ datasheet(3/23 Pages) MAXIM

Part #	MAX148BCPP+

Description	2.7V to 5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs

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Manufacturer	MAXIM [Maxim Integrated Products]

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

Serial 10-Bit ADCs

3

ELECTRICAL CHARACTERISTICS (continued)

(VDD = +2.7V to +5.25V; COM = 0; fSCLK = 2.0MHz; external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps);

MAX149—4.7FF capacitor at VREF pin; MAX148—external reference, VREF = 2.500V applied to VREF pin; TA = TMIN to TMAX, unless

otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

CONVERSION RATE (continued)

Internal Clock Frequency

SHDN = unconnected

1.8

MHz

SHDN = VDD

0.225

External Clock Frequency

0.1

2.0

MHz

Data transfer only

1

2.0

ANALOG/COM INPUTS

Input Voltage Range, Single-

Ended and Differential (Note 6)

Unipolar, COM = 0

0 to VREF

V

Bipolar, VCOM = VREF/2

±VREF/2

Multiplexer Leakage Current

On/off leakage current, VCH_ = 0 or VDD

±0.01

±1

μA

Input Capacitance

16

pF

INTERNAL REFERENCE (MAX149 Only, Reference Buffer Enabled)

VREF Output Voltage

TA = +25°C (Note 7)

2.470

2.500

2.530

V

VREF Short-Circuit Current

30

mA

VREF Temperature Coefficient

MAX149

±30

ppm/

°C

Load Regulation (Note 8)

0 to 0.2mA output load

0.35

mV

Capacitive Bypass at VREF

Internal compensation mode

0

μF

External compensation mode

4.7

Capacitive Bypass at REFADJ

0.01

μF

REFADJ Adjustment Range

±1.5

%

EXTERNAL REFERENCE AT VREF (Buffer Disabled)

VREF Input Voltage Range

(Note 9)

1.0

VDD +

50mV

V

VREF Input Current

VREF = 2.500V

100

150

μA

VREF Input Resistance

18

25

kΩ

Shutdown VREF Input Current

0.01

10

μA

REFADJ Buffer-Disable Threshold

VDD -

0.5

V

EXTERNAL REFERENCE AT REFADJ

Capacitive Bypass at VREF

Internal compensation mode

0

μF

External compensation mode

4.7

Reference Buffer Gain

MAX149

2.06

V/V

MAX148

2.00

REFADJ Input Current

MAX149

±50

μA

MAX148

±10

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