Rainbow-electronics MAX5157 Bedienungsanleitung PDF herunterladen (Seite 13)

__________Applications Information

Unipolar Output

Figure 9 depicts the MAX5156/MAX5157 configured for

unity-gain, unipolar operation. Table 2 lists the unipolar

output codes. To increase dynamic range, specific

gain configurations can be used as shown in Figure 10.

Bipolar Output

The MAX5156/MAX5157 can be configured for a bipo-

lar output, as shown in Figure 11. The output voltage is

given by the equation:

OUT

= V

REF

[((2 x NB) / 4096) - 1]

where NB represents the numeric value of the DAC’s

binary input code. Table 3 shows digital codes and the

corresponding output voltage for Figure 11’s circuit.

MAX5156/MAX5157

Low-Power, Dual, 12-Bit Voltage-Output DACs

with Configurable Outputs

______________________________________________________________________________________ 13

TO OTHER

SERIAL DEVICES

MAX5156

MAX5157

DIN

SCLK

MAX5156

MAX5157

DIN

SCLK

MAX5156

MAX5157

DIN

SCLK

DIN

SCLK

CS1

CS2

CS3

Figure 8. Multiple MAX5156/MAX5157s Sharing a Common DIN Line

MAX5156

MAX5157

DAC

REF_

OUT_

FB_

DGND

AGND

+5V/+3V

Figure 9. Unipolar Output Circuit

Table 2. Unipolar Code Table (Gain = +1)

0000 0000 0001(0)

0V0000 0000 0000(0)

0111 1111 1111(0)

1000 0000 0000(0)

DAC CONTENTS

MSB LSB

1000 0000 0001(0)

1111 1111 1111(0)

ANALOG OUTPUT

4095

4096

REF













2049

4096

REF













2047

4096

REF













4096

REF













2048

4096

REF













Note: ( ) are for the sub bit.

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

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