AD5378ABC datasheet(24/28 Pages) AD

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AD5378

Rev. PrA | Page 24 of 28

DATA DECODING

The AD5378 contains a 14-bit data bus, DB13 to DB0. Depend-

ing on the value of REG1 and REG0, this data is loaded into the

addressed DAC input register(s), offset (c) register(s), gain (m)

Table 13. DAC Data Format (REG1 = 1, REG0 = 1)

DB13 to DB0

DAC Output

11 1111 1111 1111

(16383/16384) VREF(+) V

11 1111 1111 1110

(16382/16384) VREF(+) V

10 0000 0000 0001

(8193/16384) VREF(+) V

10 0000 0000 0000

(8192/16384) VREF(+) V

01 1111 1111 1111

(8191/16384) VREF(+) V

00 0000 0000 0001

(1/16384) VREF(+) V

00 0000 0000 0000

0 V

Table 14. Offset Data Format (REG1 = 1, REG0 = 0)

DB13 to DB0

Offset (LSB)

11 1111 1111 1111

+8191

11 1111 1111 1110

+8190

10 0000 0000 0001

10 0000 0000 0000

01 1111 1111 1111

−1

00 0000 0000 0001

−8191

00 0000 0000 0000

−8192

Table 15. Gain Data Format (REG1 = 0, REG0 = 1)

DB12 to DB1

Gain

1 1111 1111 1111

8192/8192

1 1111 1111 1110

8191/8192

1 0000 0000 0001

4098/8192

1 0000 0000 0000

4097/8192

0 1111 1111 1111

4096/8192

0 0000 0000 0001

2/8192

0 0000 0000 0000

1/8192

Table 16. Special Function Data Format (REG1 = 0, REG0 = 0)

DB13 to DB0

Increment/Decrement Step (LSB)

00000 10 1111111

+127

00000 10 0000111

00000 10 0000001

00000 X0 0000000

00000 00 0000001

−1

00000 00 0000111

−7

00000 00 1111111

−128

Table 17. Soft Reset (REG1 = 0, REG0 = 0)

DB13 to DB0

DAC Output

11 1111 1111 1111

REFGND

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