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 

AD5547/AD5557

BIPOLAR MODE

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

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 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 (AD5547)

(5)

VOUT = (D/16384 − 1) × VREF (AD5557)

(6)

Data Sheet

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

Table 9. AD5547 Output vs. Code

D in Binary

VOUT

1111 1111 1111 1111

1000 0000 0000 0001

1000 0000 0000 0000

+VREF (32,767/32,768)

+VREF (1/32,768)

0

0111 1111 1111 1111

0000 0000 0000 0000

–VREF (1/32,768)

–VREF

+15V

C1

1µF

C2

0.1µF

2

U3

VIN TRIM 5

VOUT 6

GND

4

ADR01

U2A

AD8512

C8 –10V

+10V

+5V

C3

0.1µF

16/14 DATA

WR

LDAC

RS

MSB

A0, A1

R1A

VDD R1

RCOMA VREFA

R2

AD5547/AD5557

U1

WR LDAC RS MSB A0, A1

2

ROFSA RFBA

ROFS RFB

C9

16-/14-BIT

DAC A

IOUTA

AGNDA

+15V C4 1µF

U2B

C5 0.1µF

+V

VOUT

AD8512

–V

C6 0.1µF –10V TO +10V

C7 1µF

–15V

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

Rev. D | Page 16 of 20

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