Rainbow-electronics ADC1251 Manual de usuario descargar pdf (Pagina 4)

Digital and DC Electrical Characteristics

The following specifications apply for DV

CC

e

AV

CC

ea

5.0V, V

b

eb

5.0V, V

REF

ea

5.0V, and f

CLK

e

3.5 MHz unless

otherwise specified. Boldface limits apply for T

A

e

T

J

e

T

MIN

to T

MAX

; all other limits T

A

e

T

J

e

25

§

C. (Notes 6 and 7)

Symbol Parameter Condition

Typical Limit Units

(Note 9) (Note 10, 19) (Limit)

V

IN(1)

Logical ‘‘1’’ Input Voltage for V

CC

e

5.25V

2.0 V(min)

All Inputs except CLK IN

V

IN(0)

Logical ‘‘0’’ Input Voltage for V

CC

e

4.75V

0.8 V(max)

All Inputs except CLK IN

I

IN(1)

Logical ‘‘1’’ Input Current V

IN

e

5V 0.005 1 mA(max)

I

IN(0)

Logical ‘‘0’’ Input Current V

IN

e

0V

b

0.005

b

1 mA(max)

V

T

a

CLK IN Positive-Going

2.8 2.7 V(min)

Threshold Voltage

V

T

b

CLK IN Negative-Going

2.1 2.3 V(max)

Threshold Voltage

V

H

CLK IN Hysteresis

0.7 0.4 V(min)

[

V

T

a

(min)

b

V

T

b

(max)

]

V

OUT(1)

Logical ‘‘1’’ Output Voltage V

CC

e

4.75V:

I

OUT

eb

360 mA 2.4 V(min)

I

OUT

eb

10 mA 4.5 V(min)

V

OUT(0)

Logical ‘‘0’’ Output Voltage V

CC

e

4.75V,

0.4 V(max)

I

OUT

e

1.6 mA

I

OUT

TRI-STATE

É

Output Leakage V

OUT

e

0V

b

0.01

b

3 mA(max)

Current

V

OUT

e

5V 0.01 3 mA(max)

I

SOURCE

Output Source Current V

OUT

e

0V

b

20

b

6.0 mA(min)

I

SINK

Output Sink Current V

OUT

e

5V 20 8.0 mA(min)

DI

CC

DV

CC

Supply Current CS

e

‘‘1’’ 1 2.5 mA(max)

AI

CC

AV

CC

Supply Current CS

e

‘‘1’’ 2.8 10 mA(max)

I

b

V

b

Supply Current CS

e

‘‘1’’ 2.8 10 mA(max)

AC Electrical Characteristics

The following specifications apply for DV

CC

e

AV

CC

ea

5.0V, V

b

eb

5.0V, t

r

e

t

f

e

20 ns unless otherwise specified.

Boldface limits apply for T

A

e

T

J

e

T

MIN

to T

MAX

; all other limits T

A

e

T

J

e

25

§

C. (Notes 6 and 7)

Symbol Parameter Conditions

Typical Limit Units

(Note 9) (Note 10, 19) (Limit)

f

CLK

Clock Frequency MHz

0.5 MHz(min)

6.0 3.5 MHz(max)

Clock Duty Cycle 50 %

40 %(min)

60 %(max)

t

C

Conversion Time using WR 27(1/f

CLK

) 27(1/f

CLK

)

a

250 ns (max)

to start a Conversion

f

CLK

e

3.5 MHz, AZ

e

‘‘1’’ 7.7 7.95 ms(max)

f

CLK

e

1.75 MHz, AZ

e

‘‘0’’ 15.4 15.65 ms(max)

t

C

Conversion Time using S/H AZ

e

‘‘1’’ 34(1/f

CLK

) 34(1/f

CLK

)

a

250 ns (max)

to start a Conversion

f

CLK

e

3.5 MHz, AZ

e

‘‘1’’ 9.7 9.95 ms(max)

4

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