Low-Power, Quad, 12-Bit

Voltage-Output DACs with Serial Interface

12

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DAC CONTENTS

ANALOG OUTPUT

MSB

LSB

4095

1111

1111

1111

4096

2049

1000

0000

0001

4096

2048

1000

0000

0000

4096

2

2047

0111

1111

1111

4096

1

0000

0000

0001

4096

0000

0000

0000

0V

Table 2. Unipolar Code Table

DAC CONTENTS

ANALOG OUTPUT

MSB

LSB

2047

1111

1111

1111

2048

1

1000

0000

0001

2048

1000

0000

0000

0V

1

0111

1111

1111

2048

2047

0000

0000

0001

2048

2048

0000

0000

0000

2048

Table 3. Bipolar Code Table

4096

)

1

MAX5500

MAX5501

DAC A

DAC B

DAC C

DAC D

OUTA

FBA

FBB

FBC

FBD

OUTB

OUTC

OUTD

DGND

AGND

REFAB

REFCD

REFERENCE INPUTS

+5V

Figure 9. Unipolar Output Circuit

MAX5500

MAX5501

DAC A

DAC B

DAC C

DAC D

OUTA

10kΩ

10kΩ

10kΩ

10kΩ

10kΩ

10kΩ

10kΩ

10kΩ

OUTB

OUTC

OUTD

DGND

AGND

REFAB

REFCD

REFERENCE INPUTS

+5V

FBA

FBB

FBC

FBD

Figure 10. Unipolar Rail-to-Rail Output Circuit

Applications Information

Unipolar Output

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

ence inputs are of the same polarity. Figure 9 shows

the MAX5500/MAX5501 unipolar output circuit, which is

also the typical operating circuit. Table 2 lists the unipo-

lar output codes.

See Figure 10 for rail-to-rail outputs. Figure 10 shows

the MAX5500/MAX5501 with the output amplifiers con-

figured with a closed-loop gain of +2 to provide 0 to 5V

full-scale range with a 2.5V external reference voltage.

Bipolar Output

Figure 11 shows the MAX5500/MAX5501 configured for

bipolar operation.

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 the circuit of

Figure 11.