HA9P2556-9Z datasheet(10/18 Pages) INTERSIL

Part #	HA9P2556-9Z

Description	57MHz, Wideband, Four Quadrant,Voltage Output Analog Multiplier

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Manufacturer	INTERSIL [Intersil Corporation]

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10 / 18 page

10

FN2477.7

April 25, 2013

.

A multiplier can’t do nonintegral roots “exactly”, but it can

yield a close approximation. We can approximate

nonintegral roots with Equations 19 and 20 of the form:

Figure 18 compares the function VOUT = VIN

0.7 to the

approximation VOUT = 0.5VIN

0.5 + 0.5V

IN.

This function can be easily built using an HA-2556 and a

potentiometer for easy adjustment as shown in Figures 19 and

20. If a fixed nonintegral power is desired, the circuit shown in

Figure 21 eliminates the need for the output buffer amp. These

circuits approximate the function VIN

M where M is the desired

nonintegral power or root.

NC

VX + (VGAIN)

V-

VIN

V+

NC

HFA0002

5k

Ω

VOUT

500

Ω

NC

HA-2556

+

-

14

15

16

9

13

12

11

10

1

2

3

4

5

7

6

8

Σ

+ -

REF

Y

X

Z

FIGURE 16. VOLTAGE CONTROLLED AMPLIFIER

0

0.2

0.4

0.6

0.8

1.0

0

0.2

0.4

0.6

0.8

1.0

INPUT (V)

FIGURE 17. EFFECT OF NONINTEGRAL POWERS/ROOTS

X0.7

X0.5

X1.5

X2

V

O

1

α

–

()V

IN

2

αV

IN

+

=

(EQ. 19)

V

O

1

α

–

()V

IN

1/2

αV

IN

+

=

(EQ. 20)

FIGURE 19. NONINTEGRAL ROOTS - ADJUSTABLE

0

0.2

0.4

0.6

0.8

1.0

0

0.2

0.4

0.6

0.8

1.0

INPUT (V)

FIGURE 18. COMPARE APPROXIMATION TO NONINTEGRAL

ROOT

X0.7

0.5X0.5+ 0.5X

X

NC

V-

VIN

V+

NC

HA-2556

HA-5127

NC

VOUT

0V

≤ VIN ≤ 1V

0.5

≤ M ≤ 1.0

α

1-

α

+

-

14

15

16

9

13

12

11

10

1

2

3

4

5

7

6

8

Σ

+ -

REF

Y

X

Z

+

-

+

-

+

-

HA-2556

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