Datasheet

DAC8218
SBAS460A –MAY 2009–REVISED DECEMBER 2009 www.ti.com
Zero Register n, where n = 0 to 7 (default = 0000h).
The Zero Register stores the user-calibration data that are used to eliminate the offset error. The data are 14 bits
wide, 1 LSB/step, and the total adjustment is –16384 LSB to +16383 LSB, or ±50% of full-scale range. The Zero
Register uses a twos complement data format.
Table 14. Zero Register
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Z13 Z12 Z11 Z10 Z9 Z8 Z7 Z6 Z5 Z4 Z3 Z2 Z1 Z0 X X
Z13:Z0—OFFSET BITS ZERO ADJUSTMENT
1FFFh +8191 LSB
1FFEh +8190 LSB
••• ••• ••• ••• ••• •••
0001h +1 LSB
0000h 0 LSB (default)
1FFFh –1 LSB
••• ••• ••• ••• ••• •••
2001h –8191 LSB
2000h –8192 LSB
BLANKSPACE
Gain Register n, where n = 0 to 7 (default = 2000h).
The Gain Register stores the user-calibration data that are used to eliminate the gain error. The data are 14 bits
wide, 0.0015% FSR/step, and the total adjustment range 0.5 to 1.5. The Gain Register uses a straight binary
data format.
Table 15. Gain Register
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
G13 G12 G11 G10 G9 G8 G7 G6 G5 G4 G3 G2 G1 G0 X X
G13:G0—GAIN-CODE BITS GAIN ADJUSTMENT COEFFICIENT
3FFFh 1.499985
3FFEh 1.499969
••• ••• ••• ••• ••• •••
2001h 1.000015
2000h 1 (default)
1FFFh 0.999985
••• ••• ••• ••• ••• •••
0001h 0.500015
0000h 0.5
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