Rainbow-electronics ADC0820 Manual do Utilizador descarregar pdf (Página 4)

AC Electrical Characteristics (Continued) The following specifications apply for V

5V, t

20 ns,

REF

(

)

5V, V

REF

(

)

0V and T

C unless otherwise specified.

Typ

Tested Design

Parameter Conditions

(Note 6)

Limit Limit Units

(Note 7) (Note 8)

, Internal Comparison Time Pin 7

;

(Figures 3b

and

800 1300 ns

50 pF

, TRI-STATE Control R

1k, C

10 pF 100 200 ns

(Delay from Rising Edge of RD

Hi-Z State)

INTL

, Delay from Rising Edge of Pin 7

50 pF

to Falling Edge of INT t

;

(Figure 3b)

;

(Figure 3a)

200 t

290 ns

INTH

, Delay from Rising Edge of

(Figures 2, 3a

and

3b)

125 225 ns

to Rising Edge of INT C

50 pF

INTHWR

, Delay from Rising Edge of

(Figure 4)

50 pF 175 270 ns

to Rising Edge of INT

RDY

, Delay from CS to RDY

(Figure 2)

50 pF, Pin 7

0 50 100 ns

, Delay from INT to Output Valid

(Figure 4)

20 50 ns

, Delay from RD to INT Pin 7

200 290 ns

(Figure 3a)

, Delay from End of Conversion

(Figures 2, 3a, 3b

and

500 ns

to Next Conversion (Note 4) See Graph

Slew Rate, Tracking 0.1 V/ms

VIN

, Analog Input Capacitance 45 pF

OUT

, Logic Output Capacitance 5 pF

, Logic Input Capacitance 5 pF

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating

the device beyond its specified operating conditions.

Note 2: All voltages are measured with respect to the GND pin, unless otherwise specified.

Note 3: Total unadjusted error includes offset, full-scale, and linearity errors.

Note 4: Accuracy may degrade if t

or t

is shorter than the minimum value specified. See Accuracy vs t

and Accuracy vs t

graphs.

Note 5: When the input voltage (V

) at any pin exceeds the power supply rails (V

or V

) the absolute value of current at that pin should be limited

to 1 mA or less. The 4 mA package input current limits the number of pins that can exceed the power supply boundaries witha1mAcurrent limit to four.

Note 6: Typicals are at 25

C and represent most likely parametric norm.

Note 7: Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

Note 8: Design limits are guaranteed but not 100% tested. These limits are not used to calculate outgoing quality levels.

Note 9: Human body model, 100 pF discharaged through a 1.5 kX resistor.

TRI-STATE Test Circuits and Waveforms

TL/H/5501–3

TL/H/5501–5

TL/H/5501–4

20 ns TL/H/5501–6

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

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