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AD5547/AD5557

+15V

C1

1碌F

C2

0.1碌F

2

U3

VIN

TRIM

VOUT

GND

U2A

4

ADR01

AD8512

C8

5

6

鈥?0V

+10V

R

1A

+5V

VDD

R1

R

COMA

V

REFA

R2

R

OFSA

ROFS

R

FBA

RFB

C9

U2B

C5 0.1碌F

+15V

C4 1碌F

C3

0.1碌F

AD5547/AD5557

U1

16-/14-BIT

DAC A

I

OUTA

+V

VOUT

AD8512

鈥揤

C6 0.1碌F 鈥?0V TO +10V

C7 1碌F

04452-0-006

16/14 DATA

AGNDA

WR LDAC RS

WR

LDAC

RS

MSB

A0, A1

MSB A0, A1

2

鈥?5V

Figure 24. 4-Quadrant Multiplying Mode, V

OUT

= 鈥揤

REF

to +V

REF

BIPOLAR MODE

4-Quadrant Multiplying Mode, V

OUT

= 鈥揤

REF

to +V

REF

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 24). For example, with a +10 V reference,

the circuit yields a precision, bipolar 鈥?0 V to +10 V output.

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

V

OUT

= (D/32768 鈭?1) 脳

V

REF

(AD5547)

V

OUT

= (D/16384 鈭?1) 脳

V

REF

(AD5557)

(5)

(6)

Table 9. AD5547 Output vs. Code

D in Binary

1111 1111 1111 1111

1000 0000 0000 0001

1000 0000 0000 0000

0111 1111 1111 1111

0000 0000 0000 0000

V

OUT

+V

REF

(32,767/32,768)

+V

REF

(1/32,768)

0

鈥揤

REF

(1/32,768)

鈥揤

REF

Rev. 0 | Page 16 of 20

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