MAX509ACAP 데이터 시트보기 (PDF) - Maxim Integrated

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MAX509ACAP

Quad, Serial 8-Bit DACs with Rail-to-Rail Outputs

Maxim Integrated 

Quad, Serial 8-Bit DACs

with Rail-to-Rail Outputs

+5V

0.1µF

SERIAL

INTERFACE

NOT SHOWN

MAX873

R1

330k

0.1%

+2.5V

R2

330k

0.1%

+5V

27

0.1µF

3

ICL7611A 1

6

8

0.1µF

-5V

Figure 14. MAX509 AGND Bias Circuit (Negative Offset)

REFERENCE INPUTS

5 4 17 16

DAC A

+5V

18

VDD

MAX509

2

0.1µF

OUTA

DAC B

1

OUTB

DAC C

20

OUTC

DAC D

VSS

3

0.1µF

-5V

AGND

6

19

OUTD

DGND

8

4-Quadrant Multiplication

Each DAC output may be configured for 4-quadrant

multiplication using Figure 16 and 17's circuit. One op

amp and two resistors are required per channel. With

R1 = R2:

VOUT = VREF [2(NB/256)-1]

where NB represents the digital word in DAC register A.

The recommended value for resistors R1 and R2 is

330kΩ (±0.1%). Table 3 shows the digital code vs. out-

put voltage for Figure 16 and 17's circuit.

______________________________________________________________________________________ 17

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