ICL8013BCTX 데이터 시트보기 (PDF) - Intersil

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ICL8013BCTX

1MHz, Four Quadrant Analog Multiplier

Intersil 

ICL8013

XIN

MODULATOR

YIN

ZIN

IZ

IO

R= 1

10

10ZIN

VOUT = XIN

OP AMP

FIGURE 8A. DIVISION BLOCK DIAGRAM

XOS YOS ZOS

7

(0 TO -10V)

XIN

6

ZIN

3

1

YIN

10 9

ICL8013

OUTPUT = 10ZIN

XIN

4

5K

GAIN

7.5K

FIGURE 8B. DIVISION CIRCUIT CONNECTION

Squaring

The squaring function is achieved by simply multiplying with

the two inputs tied together. The squaring circuit may also be

used as the basis for a frequency doubler since cos2ωt = 1/2

(cos 2ωt + 1).

XIN

X

YIN

ZIN

IO = XIN • YIN

R= 1

10

OP AMP

VOUT = XIN2

10

FIGURE 9A. SQUARER BLOCK DIAGRAM

XIN

5kΩ

SCALE

FACTOR

ADJUST

7.5kΩ

3

6

ICL8013

1

7 10 9

OUTPUT = XIN2

10

4

XOS YOS ZOS

FIGURE 9B. SQUARER CIRCUIT CONNECTION

Square Root

Tying the X and Y inputs together and using overall feedback

from the op amp results in the square root function. The

output of the modulator is again forced to equal the current

produced by the Z input.

IO = XIN × YIN = (–VOUT)2 = 10ZIN

VOUT = – 10ZIN

The output is a negative voltage which maintains overall

negative feedback. A diode in series with the op amp output

prevents the latchup that would otherwise occur for negative

input voltages.

SQUARE ROOT TRIMMING PROCEDURE

1. Connect the ICL8013 in the Divider configuration.

2. Adjust ZOS, YOS, XOS, and Gain using Steps 1 through 6

of Divider Trimming Procedure.

3. Convert to the Square Root configuration by connecting

XIN to the output and inserting a diode between Pin 4 and

the output node.

4. With ZIN = 0V adjust ZOS for zero output voltage.

XIN

MODULATOR

YIN

IZ

IO = VO2

Z

R= 1

10

VOUT = -√10ZIN

OP AMP

FIGURE 10A. SQUARE ROOT BLOCK DIAGRAM

XOS YOS ZOS

7

XIN

(0V TO + 10V) 6

ZIN

3

YIN 1

10 9

ICL8013

1N4148 OUTPUT = -√10ZIN

4

GAIN

5K

7.5K

FIGURE 10B. ACTUAL CIRCUIT CONNECTION

Variable Gain Amplifier

Most applications for the ICL8013 are straight forward

variations of the simple arithmetic functions described

above. Although the circuit description frequently disguises

the fact, it has already been shown that the frequency

doubIer is nothing more than a squaring circuit. Similarly the

variable gain amplifier is nothing more than a multiplier, with

the input signal applied at the X input and the control voltage

applied at the Y input.

7

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