Rainbow-electronics MAX149 Manual do Utilizador descarregar pdf (Página 3)

MAX148/MAX149

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

Serial 10-Bit ADCs

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Multiplexer Leakage Current

µA0.01 10Shutdown VREF Input Current

kΩ18 25VREF Input Resistance

µA100 150VREF Input Current

1.0

50mV

VREF Input Voltage Range

(Note 9)

pF16Input Capacitance

1.8

MHz

0.225

Internal Clock Frequency

µA±0.01 ±1

UNITSMIN TYP MAXSYMBOLPARAMETER

SHDN = FLOAT

VREF = 2.500V

SHDN = V

On/off leakage current, V

CH_

= 0V or V

CONDITIONS

ELECTRICAL CHARACTERISTICS (continued)

= +2.7V to +5.25V; COM = 0V; f

SCLK

= 2.0MHz; external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps);

MAX149—4.7µF capacitor at VREF pin; MAX148—external reference, VREF = 2.500V applied to VREF pin; T

= T

MIN

to T

MAX

; unless

otherwise noted.)

V2.470 2.500 2.530VREF Output Voltage T

= +25°C (Note 7)

mA30VREF Short-Circuit Current

±30MAX149

mV0.35Load Regulation (Note 8) 0mA to 0.2mA output load

0Internal compensation mode

µF

4.7

Capacitive Bypass at VREF

External compensation mode

µF0.01Capacitive Bypass at REFADJ

%±1.5REFADJ Adjustment Range

0.5

REFADJ Buffer-Disable Threshold

µF

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/°CVREF Temperature Coefficient

0 to VREF

±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

1 2 3 4 5 6 7 8 ... 23 24

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