Rainbow-electronics MAX1109 Manual de usuario descargar pdf (Pagina 7)

MAX1108/MAX1109

Single-Supply, Low-Power,

2-Channel, Serial 8-Bit ADCs

_______________________________________________________________________________________ 7

ELECTRICAL CHARACTERISTICS—MAX1109 (continued)

= +4.5V to +5.5V; unipolar input mode; COM = GND, f

SCLK

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

cycle (50ksps); 1µF capacitor at REF, external +4.096V reference at REF; T

= T

MIN

to T

MAX

; unless otherwise noted. Typical values

are at T

= +25°C.)

CONDITIONS

External reference

Internal reference (Note 10)

µs20

ns200t

SCLK Pulse Width Low

ms12

WAKE

Wake-Up Time

ns0t

CSH

CS to SCLK Rise Hold

ns100t

CSS

CS to SCLK Rise Setup

ns200t

SCLK Pulse Width High

UNITSMIN TYP MAXSYMBOLPARAMETER

Note 1: Relative accuracy is the deviation of the analog value at any code from its theoretical value after the full-scale range has

been calibrated.

Note 2: See

Typical Operating Characteristics

Note 3: V

REF

= +2.048V (MAX1108), V

REF

= +4.096V (MAX1109), offset nulled.

Note 4: Common-mode range (CH0, CH1, COM) GND to V

Note 5: Conversion time defined as the number of clock cycles times the clock period; clock has 50% duty cycle (Figures 6 and 8).

Note 6: REF supplies typically 2.5mA under normal operating conditions.

Note 7: External load should not change during the conversion for specified accuracy.

Note 8: Power consumption with CMOS levels.

Note 9: Measured as  V

(2.7V) - V

(3.6V) for MAX1108, and measured as  V

(4.5V) - V

(5.5V) for MAX1109.

Note 10: 1µF at REF, internal reference settling to 0.5LSB.

Typical Operating Characteristics

= +3.0V (MAX1108), V

= +5.0V (MAX1109); external conversion mode; f

SCLK

= 500kHz; 50ksps; external reference; 1µF at

REF; T

= +25°C; unless otherwise noted.)

200

0 6

SUPPLY CURRENT vs. SUPPLY VOLTAGE

180

160

MAX1108/09-01

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

1 2 3 4 5

140

120

100

OUT

= 10101010

MAX1108 (2.7V TO 5.5V)

MAX1109 (4.5V TO 5.5V)

INTERNAL REFERENCE

LOAD

= 47pF

LOAD

= 10pF

200

-40 100

SUPPLY CURRENT vs. TEMPERATURE

180

160

MAX1108/09-02

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

-20 0 20 40 60 80

140

120

100

= 5V

= 3V

OUT

= 10101010

LOAD

= 10pF

INTERNAL REFERENCE

0.50

2.5 5.5

SHUTDOWN SUPPLY CURRENT

vs. SUPPLY VOLTAGE

0.10

0.05

0.45

0.40

MAX1108/09-03

SUPPLY VOLTAGE (V)

SHUTDOWN CURRENT (µA)

3.0 3.5 4.0 4.5 5.0

0.35

0.30

0.25

0.20

0.15

1 2 3 4 5 6 7 8 9 10 11 12 ... 19 20

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Rainbow-electronics MAX1109 Manual de usuario Pagina 7

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