DAC8222

–11–

REV. C

Figure 25. Bipolar Configuration (Four-Quadrant Multiplication)

resistors R5, R6, R7, should be ratio-matched to 0.01% so that

gain error meets data sheet specifications. (Corresponding resis-

tors, R8, R9, and R10 for DAC B should also be matched to

0.01%). The resistors should have identical temperature coeffi-

cients if operating over the full temperature range.

Zero and full-scale are adjusted one of two ways and are at the

user’s discretion. Zero-output can be adjusted by first setting

the digital inputs to 1000 0000 0000 and adjusting R1 (R3 for

by varying R6, R7 (R9, R10 for DAC B) ratios. Full-scale is ad-

justed by setting the digital inputs to 1111 1111 1111 and vary-

ing R5 (R8 for DAC B). Full-scale can also be adjusted by

Table III. Bipolar (Offset Binary) Code Table

(Refer to Figure 25)

Binary Number in

DAC Register

MSB

LSB

(

DAC A or DAC B)

1111 1111 1111

2047

2048









1000 0000 0001

1

2048









1000 0000 0000

0 V

0111 1111 1111

1

2048









0000 0000 0000

2048

2048









NOTE

1 LSB = (2

1

2048