Rainbow-electronics MAX5355 Uživatelský manuál stáhnout pdf (Strana 12)

Figure 7 shows a method of connecting several

MAX5354/MAX5355s. In this configuration, the clock

and the data bus are common to all devices, and sepa-

rate chip-select lines are used for each IC.

__________Applications Information

Unipolar Output

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

ence input have the same polarity. Figure 8 shows the

MAX5354/MAX5355 unipolar output circuit, which is

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

lar output codes.

Figure 9 illustrates a rail-to-rail output configuration.

This circuit shows the MAX5354 with the output amplifi-

er configured for a closed-loop gain of +2, to provide a

0V to 5V full-scale range when a 2.5V reference is

used. When the MAX5355 is used with a 1.25V refer-

ence, this circuit provides a 0V to 2.5V full-scale range.

Bipolar Output

The MAX5354/MAX5355 output can be configured for

bipolar operation using Figure 10’s circuit, according to

the following equation:

OUT

= V

REF

[(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 voltage for Figure 10’s circuit.

Using an AC Reference

In applications where the reference has AC-signal com-

ponents, the MAX5354/MAX5355 have multiplying

capability within the reference input range specifica-

tions. Figure 11 shows a technique for applying a sine-

wave signal to the reference input where the AC signal

is offset before being applied to REF. The reference

voltage must never be more negative than GND.

MAX5354/MAX5355

10-Bit Voltage-Output DACs

in 8-Pin µMAX

12 ______________________________________________________________________________________

TO OTHER

SERIAL DEVICES

MAX5354

MAX5355

DIN

SCLK

MAX5354

MAX5355

DIN

SCLK

MAX5354

MAX5355

DIN

SCLK

DIN

SCLK

CS1

CS2

CS3

Figure 7. Multiple MAX5354/MAX5355s Sharing Common DIN and SCLK Lines

Table 2. Unipolar Code Table

NOTE: ( ) are for sub-bits.

ANALOG OUTPUT

11 1111 1111 (000)

10 0000 0001 (000)

DAC CONTENTS

MSB LSB

10 0000 0000 (000)

01 1111 1111 (000)

00 0000 0000 (000) 0V

00 0000 0001 (000)

1023

1024

REF













513

1024

REF













512

1024

REF













511

1024

REF













1024

REF













1 2 ... 7 8 9 10 11 12 13 14 15 16

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