Rainbow-electronics ADC12038 Manual de usuario descargar pdf (Pagina 8)

AC Electrical Characteristics (Continued)

The following specifications apply for V

5.0 V

REF

4.096 V

REF

, 12-bit

sign conversion mode, t

3 ns, f

8 MHz for the ADC12H030, ADC12H032, ADC12H034 and ADC12H038,

5 MHz for the ADC12030, ADC12032, ADC12034 and ADC12038, R

25X, source impedance for V

REF

and

REF

25X, fully-differential input with fixed 2.048V common-mode voltage, and 10(t

) acquisition time unless otherwise

specified. Boldface limits apply for T

MIN

to T

MAX

; all other limits T

C. (Note 17)

Symbol Parameter Conditions

Typical Limits Units

(Note 10) (Note 11) (Limits)

HPU

Hardware Power-Up Time, Time from

140 250 ms (max)

PD Falling Edge to EOC Rising Edge

SPU

Software Power-Up Time, Time from

Serial Data Clock Falling Edge to 140 250 ms (max)

EOC Rising Edge

ACC

Access Time Delay from

20 50 ns (max)

Falling Edge to DO Data Valid

SET-UP

Set-Up Time of CS Falling Edge to

30 ns (min)

Serial Data Clock Rising Edge

DELAY

Delay from SCLK Falling

0 5 ns (min)

Edge to CS

Falling Edge

Delay from CS Rising Edge to R

3k, C

100 pF

40 100 ns (max)

DO TRI-STATE

HDI

DI Hold Time from Serial Data

5 15 ns (min)

Clock Rising Edge

SDI

DI Set-Up Time from Serial Data

5 10 ns (min)

Clock Rising Edge

HDO

DO Hold Time from Serial Data R

3k, C

100 pF

50 ns (max)

Clock Falling Edge 5 ns (min)

DDO

Delay from Serial Data Clock

35 50 ns (max)

Falling Edge to DO Data Valid

RDO

DO Rise Time, TRI-STATE to High R

3k, C

100 pF 10 30 ns (max)

DO Rise Time, Low to High 10 30 ns (max)

FDO

DO Fall Time, TRI-STATE to Low R

3k, C

100 pF 12 30 ns (max)

DO Fall Time, High to Low 12 30 ns (max)

Delay from CS Falling Edge

25 45 ns (max)

to DOR

Falling Edge

Delay from Serial Data Clock Falling

25 45 ns (max)

Edge to DOR

Rising Edge

Capacitance of Logic Inputs 10 pF

OUT

Capacitance of Logic Outputs 20 pF

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 41 42

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Rainbow-electronics ADC12038 Manual de usuario Pagina 8

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