AD5547 datasheet(15/20 Pages) AD

Part #	AD5547

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

PDF	20 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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15 / 20 page

AD5547/AD5557

Rev. 0 | 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 23); the output becomes

VOUT = +VREF × D/65,536 (AD5547)

(3)

VOUT = +VREF × D/16,384 (AD5557)

(4)

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

Table 8. AD5547 Unipolar Mode Positive Output vs. Code

D in Binary

VOUT (V)

1111 1111 1111 1111

+VREF(65,535/65,536)

1000 0000 0000 0000

+VREF/2

0000 0000 0000 0001

+VREF(1/65,536)

0000 0000 0000 0000

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

µF

0.1

µF

0.1

µF

VOUTA

VREFA

MSB

A0, A1

LDAC

–V

GND

ADR03

VOUT

TRIM

VIN

U2A

+5V

16-/14-BIT

Figure 23. Unipolar 2-Quadrant Multiplying Mode, VOUT = 0 to +VREF

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