Data Sheet

AD532

Rev. E | Page 9 of 14

FUNCTIONAL DESCRIPTION

The functional block diagram for the AD532 is shown in Figure 1

and the complete schematic in Figure 13. In the multiplying and

squaring modes, Z is connected to the output to close the feedback

around the output op amp. In the divide mode, it is used as an

input terminal.

The X and Y inputs are fed to high impedance differential

amplifiers featuring low distortion and good common-mode

rejection. The amplifier voltage offsets are actively laser trimmed to

zero during production.

The product of the two inputs is resolved in the multiplier cell

using Gilbert’s linearized transconductance technique. The cell

is laser trimmed to obtain VOUT = (X1 − X2)(Y1 − Y2)/10 V. The

built in op amp is used to obtain low output impedance and make

possible self contained operation. The residual output voltage offset

can be zeroed at VOS in critical applications. Otherwise, the VOS pin

should be grounded.

X2

X1

Y1

COM

R2

R34

R9

R1

Q1

Q2

Q3

Q4

Q5

Q6

R3

R6

R8

R16

Q7 Q8

Q14 Q15

Q9

Q10

R13

Y2

R18

R4

R5

R10

R32

Q28

Q11

Q12

R11

R19

R14

R12

R15

Q13

Q16 Q17

R23

R20

R22

R21

C1

Q21

R27

Q25

Z

R33

VOS

OUTPUT

R30

R28

R29

R31

Q26

Q27

Q22

Q23

Q24

R26

R25

R24

Q20

Q19

Q18

+VS

–VS CAN

Figure 13. Schematic Diagram