AD5763

Preliminary Technical Data

Rev. PrA | Page 22 of 31

FINE GAIN REGISTER

The fine gain register is addressed by setting the three REG bits to 100. The DAC address bits select with which DAC channel the data

transfer is to take place (see Table 9). The fine gain register is a 6-bit register and allows the user to adjust the gain of each DAC channel

by −32 LSBs to +31 LSBs in 1 LSB increments as shown in Table 15 and Table 16. The adjustment is made to both the positive full-scale

and negative full-scale points simultaneously, each point being adjusted by ½ of one step. The fine gain register coding is twos

complement.

Table 15. Programming AD5763 Fine Gain Register

REG2

REG1

REG0

A2

A1

A0

DB15:DB6

DB5

DB4

DB3

DB2

DB1

DB0

1

0

0

DAC Address

Don’t Care

FG5

FG4

FG3

FG2

FG1

FG0

Table 16. AD5763 Fine Gain Register Options

Gain Adjustment

FG5

FG4

FG3

FG2

FG1

FG0

+31 LSBs

0

1

1

1

1

1

+30 LSBs

0

1

1

1

1

0

-

-

-

-

-

-

No Adjustment (default)

0

0

0

0

0

0

-

-

-

-

-

-

−31 LSBs

1

0

0

0

0

1

−32 LSBs

1

0

0

0

0

0

OFFSET REGISTER

The offset register is addressed by setting the three REG bits to 101. The DAC address bits select with which DAC channel the data

transfer is to take place (see Table 9). The AD5763 offset register is an 8-bit register and allows the user to adjust the offset of each channel

by −16 LSBs to +15.875 LSBs in increments of ⅛ LSB as shown in Table 17 and Table 18. The offset register coding is twos complement.

Table 17. Programming the AD5763 Offset Register

REG2

REG1

REG0

A2

A1

A0

DB15:DB8

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

1

0

1

DAC Address

Don’t Care

OF7

OF6

OF5

OF4

OF3

OF2

OF1

OF0

Table 18. AD5763 Offset Register options

Offset Adjustment

OF7

OF6

OF5

OF4

OF3

OF2

OF1

OF0

+15.875 LSBs

0

1

1

1

1

1

1

1

+15.75 LSBs

0

1

1

1

1

1

1

0

-

-

-

-

-

-

-

-

No Adjustment (default)

0

0

0

0

0

0

0

0

-

-

-

-

-

-

-

-

−15.875 LSBs

1

0

0

0

0

0

0

1

−16 LSBs

1

0

0

0

0

0

0

0