5-26

ICL7104 with ICL8052/8068 Integrating A/D Converter Equations

• Oscillator

CRYSTAL or RC (RC on -14 Part Only)

• Oscillator Period

• Integration Clock Frequency

• Integration Period

• 60/50Hz Rejection Criterion

• Optimum Integration Current

• Full Scale Analog Input Voltage

• Integrate Resistor

• Integrate Capacitor

• Integrator Output Voltage

• Output Count

• Output Type:

Binary Amplitude with Polarity and Overrange Bits.

• Power Supply:

±15V, +5V

V++ = +15V

V- = -15V

V+ = +5V

• Auto Zero Capacitor Values

0.01

• Reference Capacitor Value

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

8192

V

IN

V

REF

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

×

(7104-14)

=

Count

32768

V

IN

V

REF

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

×

(7104-16)

=

FIGURE 17.

AUTOZERO

(COUNT)

24,576 - 8,193

98,304 - 32,769

INTEGRATE

(FIXED COUNT)

8192

32768

DEINTEGRATE

(COUNT)

0 - 16383

0 - 65535

ICL7104 - 14

ICL7104 - 16

CONVERSION TIME (IN CONTINUOUS MODE):

32,768

131,072

ICL8052/ICL7104, ICL8068/ICL7104

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