DAC8412/DAC8413

Data Sheet

Rev. G | Page 16 of 20

WRDB0

WRDB1

WRDB2

WRDB3

WRDB4

WRDB5

WRDB6

WRDB7

WRDB8

WRDB9

WRDB10

RDDACB

RDDACA

WRDACA

WRDACB

RDDACC

WRDACC

RDDACD

WRDACD

READBACKDATAIN_DB10

READOUT

READOUTBAR

READBACKDATAIN_DB11

A1

A0

DGND

R/W

DB11..DB0

CS

DAC A

DAC B

DAC C

DAC D

WRDB11

INPUT

REGISTER

OUTPUT

REGISTER

RESET

LDAC

READBACK

DATAOUT_DB11

Figure 38. Simplified I/O Logic Diagram

Careful attention to grounding is important for accurate

operation of the DAC8412. This is not because the DAC8412 is

more sensitive than other 12-bit DACs, but because with four

outputs and two references, there is greater potential for ground

loops. Because the DAC8412 has no analog ground, the ground

must be specified with respect to the reference.

REFERENCE CONFIGURATIONS

Output voltage ranges can be configured as either unipolar or

bipolar, and within these choices, a wide variety of options

exists. The unipolar configuration can be either positive or

negative voltage output, and the bipolar configuration can be

either symmetrical or nonsymmetrical.

REF10

+15V

INPUT

OUTPUT

TRIM

10kΩ

0.2µF

+10V OPERATION

+

+15V

OP400

–15V

DAC8412

OR

DAC8413

0.1µF

//10µF

Figure 39. Unipolar +10 V Operation

+15V

1µF

0.2µF

39kΩ

6.2Ω

6.2Ω

0.2µF

+15V

GAIN

100kΩ

BALANCE

100kΩ

AD688 FOR ±10V

AD588 FOR ±5V

DAC8412

OR

DAC8413

0.1µF

//10µF

–15V

±5 OR ±10V OPERATION

Figure 40. Symmetrical Bipolar Operation

Figure 40 (symmetrical bipolar operation) shows the DAC8412

configured for ±10 V operation. See the AD688 data sheet for a

full explanation of reference operation. Adjustments may not be

required for many applications since the AD688 is a very high

accuracy reference. However, if additional adjustments are

required, adjust the DAC8412 full scale first. Begin by loading

the digital full-scale code (0xFFF), and then adjust the gain

adjust potentiometer to attain a DAC output voltage of 9.9976 V.

Then, adjust the balance adjust to set the center-scale output

voltage to 0.000 V.