AD5547 Просмотр технического описания (PDF) - Analog Devices

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AD5547

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

Analog Devices 

Data Sheet

AD5547/AD5557

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)

U2

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

Table 8. AD5547 Unipolar Mode Positive Output vs. Code

D in Binary

1111 1111 1111 1111

1000 0000 0000 0000

0000 0000 0000 0001

0000 0000 0000 0000

VOUT (V)

+VREF(65,535/65,536)

+VREF/2

+VREF(1/65,536)

0

+5V

C1

1µF

2

C2

U3

1µF VIN

5

TRIM

6

VOUT

GND

4

ADR03

AD8628

C8

0.1µF

C9

1µF

–5V

C7

–2.5V

C3

0.1µF

16/14 DATA

WR

LDAC

RS

MSB

A0, A1

+2.5V

R1A

VDD R1

RCOMA VREFA

R2

AD5547/AD5557

WR LDAC RS MSB A0, A1

2

ROFSA RFBA

C6

ROFS RFB

16-/14-BIT

IOUTA

AGNDA

+5V

C4 1µF

U2B C5 0.1µF

+V

AD8628

–V

VOUTA

0V TO +2.5V

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

Rev. D | Page 15 of 20

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