3-52

All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification.

Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without

notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate

and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which

may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.

For information regarding Intersil Corporation and its products, see web site http://www.intersil.com

ICL71C03 with ICL8052/8068 Integrating A/D Converter Equations

The ICL71C03 does not have an internal crystal or RC

oscillator. It has a clock input only.

Integration Period

Integration Clock Period

60/50Hz Rejection Criterion

Optimum Integration Current

Full Scale Analog Input Voltage

Integrate Resistor

Integrate Capacitor

Integrator Output Voltage

Output Count

2

digit mode.

Output Type:

4 Nibbles BCD with Polarity and Over-range.

Power Supply:

±15V, +5V

V++ = +15V

V- = -15V

V+ = +5V

Auto Zero Capacitor Values

0.01

Reference Capacitor Value

t

INT

10 000

,

f

CLOCK

---------------------

4-1/2 Digit

()

=

t

INT

1 000

,

f

CLOCK

---------------------

3-1/2 Digit

()

=

R

INT

Buffe rGain

() V

INFS

×

I

INT

-------------------------------------------------------------

=

C

INT

t

INT

() I

INT

()

V

INT

--------------------------------

=

V

INT

t

INT

() I

INT

()

C

INT

--------------------------------

=

Count

10 000

,

V

IN

V

REF

---------------

×

(4-1/2 Digit)

=

Count

1 000

,

V

IN

V

REF

---------------

×

(3-1/2 Digit)

=

FIGURE 20. INTEGRATOR OUTPUT

AUTO ZERO

(COUNTS)

30,001 - 10,001

3,001 - 1,001

INTEGRATE

(FIXED COUNT)

10,000

1,000

DEINTEGRATE

(COUNTS)

1 - 20,001

1 - 2,001

(IN CONTINUOUS MODE)

ICL8052/ICL71C03, ICL8068/ICL71C03