ADC12H034 datasheet(9/41 Pages) NSC

9 / 41 page

AC Electrical Characteristics (Continued)

The following specifications apply for V

+ =V

A+=VD+ = +5.0 VDC,VREF+ = +4.096 VDC,VREF−=0 VDC, 12-bit + sign conver-

sion mode, t

r =tf = 3 ns, fCK =fSK = 8 MHz for the ADC12H030, ADC12H032, ADC12H034 and ADC12H038, fCK =fSK =5

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

S =25

Ω, source impedance for V

REF+ and VREF−

≤ 25Ω,

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

CK) acquisition time unless otherwise specified. Bold-

face limits apply for T

A =TJ =TMIN to TMAX; all other limits TA =TJ = 25˚C. (Note 17)

Symbol

Parameter

Conditions

Typical

(Note 10)

ADC12H030/2/4/8 ADC12030/2/4/8

Units

(Limits)

Limits

(Note 11)

Acquisition Time

6 Cycles Programmed

6(t

CK)

6(t

CK)

6(t

CK)

(min)

(Note 19)

7(t

CK)

7(t

CK)

(max)

0.75

1.2

µs (min)

0.875

1.4

µs (max)

10 Cycles Programmed

10(t

CK)

10(t

CK)

10(t

CK)

(min)

11(t

CK)

11(t

CK)

(max)

1.25

2.0

µs (min)

1.375

2.2

µs (max)

18 Cycles Programmed

18(t

CK)

18(t

CK)

18(t

CK)

(min)

19(t

CK)

19(t

CK)

(max)

2.25

3.6

µs (min)

2.375

3.8

µs (max)

34 Cycles Programmed

34(t

CK)

34(t

CK)

34(t

CK)

(min)

35(t

CK)

35(t

CK)

(max)

4.25

6.8

µs (min)

4.375

7.0

µs (max)

CKAL

Self-Calibration Time

4944(t

CK)

4944(t

CK)

4944(t

CK)

(max)

618.0

988.8

µs (max)

Auto-Zero Time

76(t

CK)

76(t

CK)

76(t

CK)

(max)

9.5

15.2

µs (max)

SYNC

Self-Calibration

2(t

CK)

2(t

CK)

2(t

CK)

(min)

or Auto-Zero

3(t

CK)

3(t

CK)

(max)

Synchronization Time

0.250

0.40

µs (min)

from DOR

0.375

0.60

µs (max)

DOR

DOR High Time

9(t

SK)

9(t

SK)

9(t

SK)

(max)

when CS is Low

1.125

1.8

µs (max)

Continuously for Read

Data and Software

Power Up/Down

CONV

CONV Valid Data Time

8(t

SK)

8(t

SK)

8(t

SK)

(max)

1.0

1.6

µs (max)

AC Electrical Characteristics

The following specifications apply for V

+ =V

A+=VD+ = +5.0 VDC,VREF+ = +4.096 VDC,VREF−=0 VDC, 12-bit + sign conver-

sion mode, t

r =tf = 3 ns, fCK =fSK = 8 MHz for the ADC12H030, ADC12H032, ADC12H034 and ADC12H038, fCK =fSK =5

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

S =25

Ω, source impedance for V

REF+ and VREF−

≤ 25Ω,

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

CK) acquisition time unless otherwise specified. Bold-

face limits apply for T

A =TJ =TMIN to TMAX; all other limits TA =TJ = 25˚C. (Note 17)

Symbol

Parameter

Conditions

Typical

(Note 10)

Limits

(Note 11)

Units

(Limits)

HPU

Hardware Power-Up Time, Time from

140

250

µs (max)

PD Falling Edge to EOC Rising Edge

SPU

Software Power-Up Time, Time from

Serial Data Clock Falling Edge to

140

250

µs (max)

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