µA

Single-Supply, Low-Power,

2-Channel, Serial 8-Bit ADCs

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3

ELECTRICAL CHARACTERISTICS—MAX1108 (continued)

CONDITIONS

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

External clock, 500kHz, 10 sclks/conv

Internal clock

External clock, 2MHz

µs

20

Conversion Time (Note 5)

35

µs

1

Track/Hold Acquisition Time

ps

<50

Aperture Jitter

ns

10

Aperture Delay

kHz

400

Internal Clock Frequency

(Note 6)

0 to 0.5mA (Note 7)

ppm/°C

±50

REF Tempco

µA

150

REF Short-Circuit Current

mV

2.5

Load Regulation

kHz

50

500

V

1.968

2.048

2.128

Output Voltage

+2.048V at REF, full scale,

500kHz external clock

µA

1

20

Input Current

V

2.7

3

5.5

Supply Voltage

0.5

2.5

mV

±0.4

±4

PSR

Power-Supply Rejection (Note 9)

105

250

130

µF

1

Capacitive Bypass at REF

V

0.2

Input Hysteresis

V

0.8

Threshold Voltage Low

µA

±1

Input Current High

V

2

V

3

Threshold Voltage High

MHz

2

External Clock Frequency Range

V

1.0

Input Voltage Range

µA

±1

Input Current Low

pF

15

Input Capacitance

For data transfer only

Internal reference

External reference

70

Internal reference

External reference

95

µA

Supply Current (Notes 2, 8)

TRACK/HOLD

INTERNAL REFERENCE

EXTERNAL REFERENCE

POWER REQUIREMENTS

DIGITAL INPUTS (DIN, SCLK, and CS)