AD5451 datasheet(15/20 Pages) AD

Part #	AD5451

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

PDF	20 Pages

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Manufacturer	AD [Analog Devices]

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15 / 20 page

Data Sheet

AD5547/AD5557

Rev. D | Page 15 of 20

2-Quadrant Multiplying Mode, VOUT = 0 V to +VREF

The AD5547/AD5557 are designed to operate with either

positive or negative reference voltages. As a result, a positive

output can be achieved with an additional op amp, (see

Figure 22); the output becomes

VOUT = +VREF × D/65,536 (AD5547)

(3)

VOUT = +VREF × D/16,384 (AD5557)

(4)

Table 8 shows the positive output vs. code for the AD5547.

Table 8. AD5547 Unipolar Mode Positive Output vs. Code

D in Binary

OUT (V)

1111 1111 1111 1111

REF(65,535/65,536)

1000 0000 0000 0000

REF/2

0000 0000 0000 0001

REF(1/65,536)

0000 0000 0000 0000

1µF

0.1µF

–5V

LDAC

–2.5V

+2.5V

0V TO +2.5V

+5V

AD8628

AD5547/AD5557

R1A

16/14 DATA

VDD

RCOMA

ROFSA

RFBA

RFB

ROFS

MSB A0, A1

IOUTA

AGNDA

U2B

1µF

0.1µF

1µF

0.1µF

VOUTA

VREFA

MSB

A0, A1

LDAC

–V

GND

ADR03

VOUT

TRIM

VIN

+5V

16-/14-BIT

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

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