AD5546 datasheet(14/16 Pages) AD

Part #	AD5546

Description	Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors

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AD5546/AD5556

Rev. 0 | Page 14 of 16

C8

0.1

µF

C9

1

µF

–5V

16/14-BIT

2

+5V

5

6

+2.5V

4

GND

VIN

TRIM

U3

ADR03

VOUT

VDD

R1

ROFS

ROFSA

VOUT

0V TO +2.5V

RFB

RFBA

C6

GND

U1

AD5546/AD5556

IOUT

R2

RCOMA

R1A

16/14 DATA

REFA

U2B

AD8628

–

+

C4

1

µF

C5

0.1

µF

+5V

WR

LDAC

RS

MSB

C2

0.1

µF

C1

1

µF

C3

0.1

µF

V+

V–

U2A

AD8628

+

–

C7

–2.5V

V+

V–

Figure 22. Unipolar 2-Quadrant Multiplying Mode, VOUT = 0 to +VREF

16/14-BIT

2

+15V

5

6

4

GND

VIN

TRIM

U3

ADR01

VOUT

VDD

R1

ROFS

ROF

VOUT

–10V TO +10V

RFB

C9

GND

U1

AD5546/AD5556

IOUT

R2

RCOM

R1

16/14 DATA

REF

U2B

AD8512

–

+

C4

1

µF

C5

0.1

µF

C6

0.1

µF

C7

1

µF

+15V

–15V

WR

LDAC

RS

MSB

C2

0.1

µF

C1

1

µF

C3

0.1

µF

V+

V–

U2A

AD8512

+

–

C8

+10V

–10V

+5V

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

BIPOLAR MODE

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

The AD5546/AD5556 contain on-chip all the 4-quadrant

resistors necessary for the 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 (AD5546)

(5)

VOUT = (D/16384 − 1) × VREF (AD5556)

(6)

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