400ksps/300ksps, Single-Supply, Low-Power, 8-Channel,

Serial 12-Bit ADCs with Internal Reference

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5

ELECTRICAL CHARACTERISTICS—MAX1281 (continued)

Normal operating mode

Normal operating mode

Normal operating mode

CONDITIONS

MHz

0.5

4.8

Serial Clock Frequency

ps

<50

Aperture Jitter

ns

10

Aperture Delay

ns

625

Track/Hold Acquisition Time

µs

3.3

Conversion Time (Note 5)

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

To power down the internal reference

For small adjustments, from 1.22V

0 to 0.75mA output load

referenced to COM or CH_

V/V

2.05

Buffer Voltage Gain

V

1.4

REFADJ Buffer Disable

Threshold

mV

±100

REFADJ Input Range

V

1.22

REFADJ Output Voltage

µF

0.01

10

Capacitive Bypass at REFADJ

µF

4.7

10

Capacitive Bypass at REF

mV/mA

0.1

2.0

Load Regulation (Note 7)

ppm/°C

±15

REF Output Temperature

Coefficient

mA

15

REF Short-Circuit Current

V

2.480

2.500

2.520

REF Output Voltage

pF

18

Input Capacitance

µA

±0.001

±1

Multiplexer Leakage Current

%

40

60

Duty Cycle

V

Input Voltage Range, Single-

Ended and Differential (Note 6)

(Note 8)

pF

15

Input Capacitance

µA

±1

Input Leakage

V

0.2

Input Hysteresis

V

0.8

Input Low Voltage

V

2.0

Input High Voltage

5

REF Input Current

320

µA

200

350

V

1.0

50mV

REF Input Voltage Range

CONVERSION RATE

ANALOG INPUTS (CH7–CH0, COM)

INTERNAL REFERENCE

EXTERNAL REFERENCE (Reference buffer disabled, reference applied to REF)

DIGITAL INPUTS (DIN, SCLK, CS, SHDN)