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MAX5251ACAP

+3V, Quad, 10-Bit Voltage-Output DAC with Serial Interface

Maxim Integrated 

+3V, Quad, 10-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

MAX5251 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 MAX5251 with the output amplifiers configured with

a closed-loop gain of +2.6 to provide 0V to 3.25V full-

scale range when a 1.25V reference is used.

Table 2. Unipolar Code Table

DAC CONTENTS

MSB

LSB

1111 1111 11(00)

1000 0000 01(00)

1000 0000 00(00)

0111 1111 11(00)

0000 0000 01(00)

0000 0000 00(00)

ANALOG OUTPUT

+VREF

(

—1—02—3

1024

)

+VREF

(

—5—13—

1024

)

+VREF ( —5—12— ) = —+—VR—E—F

1024

2

+VREF

(

—5—11—

1024

)

+VREF

(

——1 —

1024

)

0V

Bipolar Output

The MAX5251 outputs can be configured for bipolar

operation using Figure 11’s circuit:

VOUT = VREF [(2NB / 1024) - 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.

MAX5251

REFERENCE INPUTS

REFAB

REFCD

+3.3V

VDD

DAC A

FBA

OUTA

FBB

DAC B

OUTB

FBC

DAC C

OUTC

FBD

DAC D

AGND

DGND

OUTD

Table 3. Bipolar Code Table

DAC CONTENTS

MSB

LSB

1111 1111 11(00)

1000

1000

0111

0000 01(00)

0000 00(00)

1111 11(00)

0000 0000 01(00)

0000 0000 00(00)

ANALOG OUTPUT

+VREF ( —55—1121— )

+VREF ( —5—112— )

0V

-VREF ( —5—112— )

-VREF ( —55—1121— )

-VREF

(

—5—12—

512

)

=

-VREF

( ) Sub-bits

Figure 9. Unipolar Output Circuit

______________________________________________________________________________________ 13

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