DAC8412/DAC8413

–13–

REV. D

The 0.2

µF bypass capacitors shown at the reference inputs

in Figure 37 should be used whenever

± 10 V references are

used. Applications with single references or references to

±5 V

may not require the 0.2

µF bypassing. The 6.2 Ω resistor in series

with the output of the reference amplifier is to keep the amplifier

from oscillating with the capacitive load. We have found that this is

large enough to stabilize this circuit. Larger resistor values are

acceptable, provided that the drop across the resistor doesn’t

mum current of 2.75 mA, then the resistor should be under

200

Ω for the loading of a single DAC8412.

Using two separate references is not recommended. Having two

references could cause different drifts with time and tempera-

ture; whereas with a single reference, most drifts will track.

Unipolar positive full-scale operation can usually be set with a

reference with the correct output voltage. This is preferable to

using a reference and dividing down to the required value. For a

10 V full-scale output, the circuit can be configured as shown

in Figure 38. In this configuration the full-scale value is set first

by adjusting the 10 k

Ω resistor for a full-scale output of 9.9976 V.

0.1 F

//10 F

DAC8412

OR

DAC8413

10k

0.2 F

0.01 F

10 F

–15V

GND

TRIM

OUTPUT

ZERO TO –10V OPERATION

REF08

Figure 38. Unipolar –10 V Operation

Figure 38 shows the DAC8412 configured for –10 V to 0 V

operation. A REF08 with a –10 V output is connected directly

Single +5 V Supply Operation

For operation with a +5 V supply, the reference voltage should be

set between 1.0 V and +2.5 V for optimum linearity. Figure

39 shows a REF43 used to supply a +2.5 V reference voltage.

The headroom of the reference and DAC are both sufficient to

support a +5 V supply with

should be connected to the same supply. Separate bypassing

to each pin should also be used.

+5V

10 F

0.1 F

//10 F

0.01 F

10k

INPUT

OUTPUT

GND

TRIM

0.2 F

ZERO TO +2.5V OPERATION

SINGLE +5V SUPPLY

REF43

DAC8412

OR

DAC8413

Figure 39. +5 V Single Supply Operation