MAX125CEAX 参数 Datasheet PDF下载

+2.7V to +5.25V, Low-Power, 4-Channel,

Serial 10-Bit ADCs in QSOP-16

ELECTRICAL CHARACTERISTICS (continued)

(V

DD

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

SCLK

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

MAX1248—4.7µF capacitor at VREF pin; MAX1249—external reference, VREF = 2.500V applied to VREF pin; T

A

= T

MIN

to T

MAX

,

unless otherwise noted.)

PARAMETER

ANALOG/COM INPUTS

Input Voltage Range, Single-

Ended and Differential (Note 6)

Multiplexer Leakage Current

Input Capacitance

INTERNAL REFERENCE

(MAX1248 only, reference buffer enabled)

VREF Output Voltage

VREF Short-Circuit Current

VREF Temperature Coefficient

Load Regulation (Note 8)

Capacitive Bypass at VREF

Capacitive Bypass at REFADJ

REFADJ Adjustment Range

EXTERNAL REFERENCE AT VREF

(Buffer disabled)

VREF Input Voltage Range

(Note 9)

VREF Input Current

VREF Input Resistance

Shutdown VREF Input Current

REFADJ Buffer-Disable Threshold

EXTERNAL REFERENCE AT REFADJ

Capacitive Bypass at VREF

Reference-Buffer Gain

REFADJ Input Current

DIGITAL INPUTS

(DIN, SCLK,

CS, SHDN)

DIN, SCLK,

CS

Input High Voltage

DIN, SCLK,

CS

Input Low Voltage

DIN, SCLK,

CS

Input Hysteresis

DIN, SCLK,

CS

Input Leakage

DIN, SCLK,

CS

Input Capacitance

SHDN

Input High Voltage

SHDN

Input Mid Voltage

SHDN

Input Low Voltage

SHDN

Input Current

V

IH

V

IL

V

HYST

I

IN

C

IN

V

SH

V

SM

V

SL

I

S

SHDN

= 0V or V

DD

V

IN

= 0V or V

DD

(Note 10)

V

DD

- 0.4

1.1

V

DD

- 1.1

0.4

±4.0

0.2

±0.01

±1

15

V

DD

≤

3.6V

V

DD

> 3.6V

2.0

3.0

0.8

V

V

V

µA

pF

V

V

V

µA

Internal compensation mode

External compensation mode

MAX1248

MAX1249

MAX1248

MAX1249

0

4.7

2.06

2.00

±50

±10

µF

V/V

µA

V

DD -

0.5

VREF = 2.500V

18

1.0

100

25

0.01

10

V

DD

+

50mV

150

V

µA

kΩ

µA

V

MAX1248

0mA to 0.2mA output load

Internal compensation mode

External compensation mode

0

4.7

0.01

±1.5

±30

0.35

T

A

= +25°C (Note 7)

2.470

2.500

2.530

30

V

mA

ppm/°C

mV

µF

µF

%

SYMBOL

CONDITIONS

Unipolar, COM = 0V

Bipolar, COM = VREF / 2

On/off leakage current, V

CH_

= 0V or V

DD

MIN

TYP

MAX

UNITS

MAX1248/MAX1249

0 to VREF

±VREF / 2

±0.01

±1

16

V

µA

pF

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