Datasheet

AD5390/AD5391/AD5392 Data Sheet
Rev. E | Page 24 of 44
DATA DECODING
AD5390/AD5392
The AD5390/AD5392 contain an internal 14-bit data bus.
The input data is decoded depending on the data loaded to
the REG1 and REG0 bits of the input serial register. This is
shown in Table 10.
Data from the serial input register is loaded into the addressed
DAC input register, offset (c) register, or gain (m) register. The
format data, and the offset (c) and gain (m) register contents
are shown in Table 11 to Table 13.
Table 10. Register Selection
REG1 REG0 Register Selected
1 1 Input data register (x1)
1 0 Offset register (c)
0 1 Gain register (m)
0 0 Special function registers (SFRs)
Table 11. AD5390/AD5392 DAC Data Format
(REG1 = 1, REG0 = 1)
DB13 to DB0 DAC Output (V)
11 1111 1111 1111 2 V
REF
× (16383/16384)
11 1111 1111 1110 2 V
REF
× (16382/16384)
10 0000 0000 0001 2 V
REF
× (8193/16384)
10 0000
0000
0000
2 V
REF
× (8192/16384)
01 1111 1111 1111 2 V
REF
× (8191/16384)
00 0000 0000 0001 2 V
REF
× (1/16384)
00 0000 0000 0000 0
Table 12. AD5390/AD5392 Offset Data Format
(REG1 = 1, REG0 = 0)
DB13 to DB0 Offset (LSB)
111111 1111 1111 +8191
111111 1111 1110 +8190
100000
0000
0001
+1
100000 0000 0000 +0
011111 1111 1111 –1
000000 0000 0001 –8191
000000 0000 0000 –8192
Table 13. AD5390/AD5392 Gain Data Format
(REG1 = 0, REG0 = 1)
DB13 to DB0 Gain Factor
11 1111 1111 1110 1
10 1111 1111 1110 0.75
01 1111
1111
1110
0.5
00 1111 1111 1110 0.25
00 0000 0000 0000 0
AD5391
The AD5391 contains an internal 12-bit data bus. The input
data is decoded depending on the value loaded to the REG1 and
REG0 bits of the input serial register. The input data from the
serial input register is loaded into the addressed DAC input
register, offset (c) register, or gain (m) register. The format data
and the offset (c) and gain (m) register contents are shown in
Table 14 to Table 16.
Table 14. AD5391 DAC Data Format (REG1 = 1, REG0 = 1)
DB11 to DB0 DAC Output (V)
1111 1111 1111 2 V
REF
× (4095/4096)
1111 1111 1110 2 V
REF
× (4094/4096)
1000 0000 0001 2 V
REF
× (2049/4096)
1000 0000 0000 2 V
REF
× (2048/4096)
0111 1111 1111 2 V
REF
× (2047/4096)
0000 0000 0001 2 V
REF
× (1/4096)
0000 0000 0000 0
Table 15. AD5391 Offset Data Format (REG1 = 1, REG0 = 0)
DB11 to DB0 Offset (LSB)
1111 1111 1111 +2047
1111 1111 1110 +2046
1000 0000 0001 +1
1000 0000 0000 +0
0111 1111 1111 –1
0000
0000
0001
–2047
0000 0000 0000 –2048
Table 16. AD5391 Gain Data Format (REG1 = 0, REG0 = 1)
DB11 to DB0
Gain Factor
1111 1111 1110 1
1011 1111 1110 0.75
0111 1111 1110 0.5
0011 1111 1110 0.25
0000 0000 0000 0