Datasheet

DAC8728
www.ti.com SBAS466A –JUNE 2009–REVISED NOVEMBER 2009
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, as shown in
Table 14. The data are 16 bits wide, 1 LSB/step, and the total adjustment is –32768 LSB to +32767 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
Z15 Z14 Z13 Z12 Z11 Z10 Z9 Z8 Z7 Z6 Z5 Z4 Z3 Z2 Z1 Z0
Z15:Z0—OFFSET BITS ZERO ADJUSTMENT
7FFFh +32767 LSB
7FFEh +32766 LSB
••• ••• ••• ••• ••• •••
0001h +1 LSB
0000h 0 LSB (default)
FFFFh –1 LSB
••• ••• ••• ••• ••• •••
8001h –32767 LSB
8000h –32768 LSB
Gain Register n (where n = 0 to 7). Default = 8000h.
The Gain Register stores the user-calibration data that are used to eliminate the gain error, as shown in
Table 15. The data are 16 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
G15 G14 G13 G12 G11 G10 G9 G8 G7 G6 G5 G4 G3 G2 G1 G0
G15:G0—GAIN-CODE BITS GAIN ADJUSTMENT COEFFICIENT
FFFFh 1.499985
FFFEh 1.499969
••• ••• ••• ••• ••• •••
8001h 1.000015
8000h 1 (default)
7FFFh 0.999985
••• ••• ••• ••• ••• •••
0001h 0.500015
0000h 0.5
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