Datasheet

AD5378
Rev. A | 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)
register(s), or the special function register.
Table 13. DAC Data Format (REG1 = 1, REG0 = 1)
DB13 to DB0 DAC Output
11 1111 1111 1111 (16383/16384) V
REF
(+) V
11 1111 1111 1110 (16382/16384) V
REF
(+) V
10 0000 0000 0001 (8193/16384) V
REF
(+) V
10 0000 0000 0000 (8192/16384) V
REF
(+) V
01 1111 1111 1111 (8191/16384) V
REF
(+) V
00 0000 0000 0001 (1/16384) V
REF
(+) 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 +1
10 0000 0000 0000 +0
01 1111 1111 1111 −1
00 0000 0000 0001 −8191
00 0000 0000 0000 −8192
Table 15. Gain Data Format (REG1 = 0, REG0 = 1)
DB13 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 +7
00000 10 0000001 +1
00000 X0 0000000 0
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