AD8021 datasheet(16/20 Pages) AD

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AD5547/AD5557

Data Sheet

Rev. D | Page 16 of 20

BIPOLAR MODE

4-Quadrant Multiplying Mode, VOUT = –VREF to +VREF

The AD5547/AD5557 contain on-chip all the 4-quadrant

resistors necessary for precision bipolar multiplying operation.

Such a feature minimizes the number of exponent components

to only a voltage reference, dual op amp, and compensation

capacitor (see Figure 23). For example, with a +10 V reference,

the circuit yields a precision, bipolar –10 V to +10 V output.

VOUT = (D/32768 − 1) × VREF (AD5547)

(5)

VOUT = (D/16384 − 1) × VREF (AD5557)

(6)

Table 9 shows some of the results for the 16-bit AD5547.

Table 9. AD5547 Output vs. Code

D in Binary

OUT

1111 1111 1111 1111

REF (32,767/32,768)

1000 0000 0000 0001

REF (1/32,768)

1000 0000 0000 0000

0111 1111 1111 1111

–V

REF (1/32,768)

0000 0000 0000 0000

–V

REF

C6 0.1µF

C7 1µF

+10V

–10V

–15V

–10V TO +10V

+15V

AD8512

AD5547/AD5557

U2A

R1A

16/14 DATA

VDD

RCOMA

ROFSA

RFBA

RFB

ROFS

MSB

A0, A1

IOUTA

AGNDA

U2B

C4 1µF

1µF

0.1µF

C5 0.1µF

VOUT

VREFA

MSB

A0, A1

LDAC

–V

GND

ADR01

VOUT

TRIM

VIN

+15V

+5V

16-/14-BIT

DAC A

Figure 23. 4-Quadrant Multiplying Mode, VOUT = –VREF to +VREF

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