Rainbow-electronics MAX1109 Bedienungsanleitung PDF herunterladen (Seite 3)

µA

MAX1108/MAX1109

Single-Supply, Low-Power,

2-Channel, Serial 8-Bit ADCs

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS—MAX1108 (continued)

= +2.7V to +3.6V; unipolar input mode; COM = GND, f

SCLK

= 500kHz, external clock mode (50% duty cycle); 10 clocks/conver-

sion cycle (50ksps); 1µF capacitor at REF, external +2.048V reference at REF; T

= T

MIN

to T

MAX

; unless otherwise noted. Typical

values are at T

= +25°C.)

CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER

External clock, 500kHz, 10 sclks/conv

Internal clock

External clock, 2MHz

µs

CONV

Conversion Time (Note 5)

µs1t

ACQ

Track/Hold Acquisition Time

ps<50Aperture Jitter

ns10Aperture Delay

kHz400Internal Clock Frequency

(Note 6)

0 to 0.5mA (Note 7)

ppm/°C±50REF Tempco

µA150I

REFSC

REF Short-Circuit Current

mV2.5Load Regulation

kHz50 500

V1.968 2.048 2.128V

REF

Output Voltage

+2.048V at REF, full scale,

500kHz external clock

µA1 20Input Current

V2.7 3 5.5V

Supply Voltage

Power down, V

= 2.7V to 3.6V

Full-scale input, V

= 2.7V to 3.6V

0.5 2.5

mV±0.4 ±4PSRPower-Supply Rejection (Note 9)

= 2.7V to 3.6V,

= 10pF

= 5.5V,

= 10pF

105 250

130

µF1Capacitive Bypass at REF

V0.2V

HYST

Input Hysteresis

V0.8V

Threshold Voltage Low

µA±1I

Input Current High

≤ 3.6V

> 3.6V

Threshold Voltage High

MHz2

External Clock Frequency Range

V1.0 V

+ 0.05Input Voltage Range

µA±1I

Input Current Low

pF15C

Input Capacitance

For data transfer only

Internal reference

External reference 70

Internal reference

External reference 95

µASupply Current (Notes 2, 8)

TRACK/HOLD

INTERNAL REFERENCE

EXTERNAL REFERENCE

POWER REQUIREMENTS

DIGITAL INPUTS (DIN, SCLK, and CS)

1 2 3 4 5 6 7 8 ... 19 20

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