Rainbow-electronics MAX5253 Manual de usuario descargar pdf (Pagina 13)

__________Applications Information

Unipolar Output

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

ence inputs have the same polarity. Figure 9 shows the

MAX5253 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 MAX5253 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.

Bipolar Output

The MAX5253 outputs can be configured for bipolar

operation using Figure 11’s circuit.

OUT

= V

REF

[(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.

MAX5253

+3V, Quad, 12-Bit Voltage-Output DAC

with Serial Interface

______________________________________________________________________________________ 13

Table 2. Unipolar Code Table

Table 3. Bipolar Code Table

DAC CONTENTS

ANALOG OUTPUT

MSB LSB

4095

1111 1111 1111 +V

REF

(——— )

4096

2049

1000 0000 0001 +V

REF

(——— )

4096

2048 +V

REF

1000 0000 0000 +V

REF

(——— )= ————

4096 2

2047

0111 1111 1111 +V

REF

(——— )

4096

0000 0000 0001 +V

REF

(——— )

4096

0000 0000 0000 0V

DAC CONTENTS

ANALOG OUTPUT

MSB LSB

2047

1111 1111 1111 +V

REF

(——— )

2048

1000 0000 0001 +V

REF

(——— )

2048

1000 0000 0000 0V

0111 1111 1111 -V

REF

(——— )

2048

2047

0000 0000 0001 -V

REF

(——— )

2048

0000 0000 0000 -V

REF

(——— )= -V

REF

2048

MAX5253

DAC A

DAC B

DAC C

DAC D

OUTA

FBA

FBB

FBC

FBD

OUTB

OUTC

OUTD

DGNDAGND

REFAB

REFCD

REFERENCE INPUTS



+3.3V

Figure 9. Unipolar Output Circuit

1 2 ... 8 9 10 11 12 13 14 15 16

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Rainbow-electronics MAX5253 Manual de usuario Pagina 13

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