MAX525ACAP Просмотр технического описания (PDF) - Maxim Integrated

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MAX525ACAP

Low-Power, Quad, 12-Bit Voltage-Output DAC with Serial Interface

Maxim Integrated 

Low-Power, Quad, 12-Bit Voltage-Output DAC

with Serial Interface

__________Applications Information

Unipolar Output

For a unipolar output, the output voltages and the refer-

ence inputs have the same polarity. Figure 9 shows the

MAX525 unipolar output circuit, which is also the typi-

cal operating circuit. Table 2 lists the unipolar output

codes.

For rail-to-rail outputs, see Figure 10. This circuit shows

the MAX525 with the output amplifiers configured with a

closed-loop gain of +2 to provide 0V to 5V full-scale

range when a 2.5V reference is used.

Table 2. Unipolar Code Table

DAC CONTENTS

MSB

LSB

1111 1111 1111

1000 0000 0001

1000 0000 0000

0111 1111 1111

0000 0000 0001

0000 0000 0000

ANALOG OUTPUT

+VREF

(

—4—09—5

4096

)

+VREF

(

—2—04—9

4096

)

+VREF ( —2—04—8 ) = —+—VR—E—F

4096

2

+VREF

(

—2—04—7

4096

)

+VREF

(

——1 —

4096

)

0V

Table 3. Bipolar Code Table

DAC CONTENTS

MSB

LSB

1111 1111 1111

1000

1000

0111

0000 0001

0000 0000

1111 1111

0000 0000 0001

0000 0000 0000

ANALOG OUTPUT

+VREF ( —22—0044—87 )

+VREF ( —2—014—8 )

0V

-VREF ( —2—014—8 )

-VREF ( —22—0044—87 )

-VREF

(

—20—4—8

2048

)

=

-VREF

Note:

1LSB

=

(VREF)

(

1

4096

)

Bipolar Output

The MAX525 outputs can be configured for bipolar

operation using Figure 11’s circuit.

VOUT = VREF [(2NB / 4096) - 1]

where NB is the numeric value of the DAC’s binary

input code. Table 3 shows digital codes (offset binary)

and corresponding output voltages for Figure 11’s

circuit.

MAX525

REFERENCE INPUTS

REFAB

REFCD

+5V

VDD

DAC A

FBA

OUTA

FBB

DAC B

OUTB

FBC

DAC C

OUTC

FBD

DAC D

AGND

DGND

OUTD

Figure 9. Unipolar Output Circuit

______________________________________________________________________________________ 13

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