AD532 datasheet(11/17 Pages) AD

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AD532

Rev. D | Page 10 of 16

FUNCTIONAL DESCRIPTION

The functional block diagram for the AD532 is shown in

Figure 1and the complete schematic in Figure 14. 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 volts. 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.

COM

R34

R16

Q7 Q8

Q14 Q15

Q10

R13

R18

R10

R32

Q28

Q11

Q12

R11

R19

R14

R12

R15

Q13

Q16 Q17

R23

R20

R22

R21

Q21

R27

Q25

R33

VOS

OUTPUT

R30

R28

R29

R31

Q26

Q27

Q22

Q23

Q24

R26

R25

R24

Q20

Q19

Q18

+VS

–VS CAN

Figure 14. Schematic Diagram

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