Datasheet

LT6660
10
6660fa
Output Accuracy
Like all references, either series or shunt, the error budget
of the LT6660s is made up of primarily three components:
initial accuracy, temperature coefficient and load regulation.
Line regulation is neglected because it typically contributes
only 150ppm/V. The LT6660s typically shift 0.02% when
soldered into a PCB, so this is also neglected. The output
errors are calculated as follows for a 100µA load and 0°C
to 70°C temperature range:
LT6660HCDC
Initial Accuracy = 0.2%
For I
OUT
= 100µA
ΔV
OUT
= (4000ppm/mA)(0.1mA) = 0.04%
For Temperature 0°C to 70°C the maximum ΔT = 70°C
ΔV
OUT
= (20ppm/°C)(70°C) = 0.14%
Total worst-case output error is:
0.2% + 0.04% + 0.14% = 0.380%
Table 2 gives the worst-case accuracy for LT6660HC,
LT6660JC and LT6660KC from 0°C to 70°C, and shows
that if the LT6660HC is used as a reference instead of a
regulator, it is capable of 8 bits of absolute accuracy over
temperature without a system calibration.
Table 2. Worst-Case Output Accuracy over Temperature
I
OUT
LT6660HCDC LT6660JCDC LT6660KCDC
0µA 0.340% 0.540% 0.850%
100µA 0.380% 0.580% 0.890%
10mA 0.640% 0.840% 1.15%
20mA 0.540% 0.740% 1.05%
APPLICATIO S I FOR ATIO
W UU
U