Analog Devices AN272 Application Notes
AN-272
a
One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106 • 781/329-4700 • World Wide Web Site: http://www.analog.com
APPLICATION NOTE
Accuracies of the AD590
The following tables contain maximum errors by grade
for applications involving limited temperature spans.
The tables reflect the worst case nonlinearities of the
AD590, which invariably occur at the ends of the specified temperature range. The “trims” in each table refer
to the error correction circuits on pages 4 and 5 of the
AD590 data sheet (Figures 4 and 7a). All accuracies
given below are ±°C. For example, ±1°C accuracy is
M GRADE
Number Temperature
Of Trims Span (8C) –55 –25 0 +25 +50 +75 +100 +125
None 10 0.6 0.5 0.6 0.6 0.7 0.7 0.7 0.9
None 25 0.8 0.8 0.7 0.7 0.8 0.8 1.0 1.1
None 50 1.0 0.9 0.8 0.9 0.9 1.1 1.2 —
None 100 1.3 1.4 1.3 1.4 1.5 — — —
None 150 1.5 1.6 1.6 —————
None 205 1.7 ———————
One 10 0.2 0.1 0.1 0.1 0.1 0.1 0.1 0.2
One 25 0.4 0.3 0.2 0.2 0.2 0.2 0.3 0.4
One 50 0.5 0.4 0.3 0.3 0.3 0.4 0.5 —
One 100 0.8 0.8 0.7 0.7 0.8 — — —
One150 0.90.90.9—————
One205 1.0———————
Two10 0.1******0.1
Two25 0.1******0.1
Two50 0.2*****0.2—
Two 100 0.2 0.1 * 0.1 0.2 — — —
Two150 0.30.20.3—————
Two205 0.3———————
*BeIow ±0.05° C
required over the +25°C to +75°C range, then trimming a
J grade device using the circuit of Figure 4 on the AD590
data sheet will result in a sensor of the required accuracy and range.
Lowest Temperature In Span (8C)
AN-272
L GRADE
Lowest Temperature In Span (8C)
Number Temperature
Of Trims Span (8C) –55 –25 0 +25 +50 +75 +100 +125
None 10 1.0 1.0 1.1 1.1 1.2 1.3 1.4 1.6
None 25 1.3 1.3 1.3 1.4 1.5 1.6 1.7 1.9
None 50 1.9 1.8 1.7 1.8 1.9 2.1 2.4 —
None 100 2.4 2.4 2.4 2.4 2.7 — — —
None 150 2.7 2.6 2.8 —————
None 205 3.0 ———————
One 10 0.2 0.1 0.1 0.1 0.1 0.1 0.1 0.2
One 25 0.5 0.4 0.3 0.3 0.3 0.3 0.4 0.5
One 50 1.0 0.8 0.6 0.6 0.6 0.8 1.0 —
One 100 1.3 1.2 1.1 1.1 1.3 — — —
One150 1.41.31.4—————
One205 1.6———————
Two10 0.1******0.1
Two25 0.1******0.1
Two50 0.2*****0.2—
Two 100 0.3 0.2 0.1 0.2 0.3 — — —
Two150 0.30.20.3—————
Two205 0.4———————
*BeIow ±0.05°C
K GRADE
Lowest Temperature In Span (8C)
Number Temperature
Of Trims Span (8C) –55 –25 0 +25 +50 +75 +100 +125
None 10 2.1 2.3 2.5 2.7 2.9 3.1 3.3 3.6
None 25 2.6 2.7 2.8 3.0 3.2 3.5 3.8 4.2
None 50 3.8 3.5 3.4 3.6 3.8 4.3 5.1 —
None 100 4.2 4.3 4.4 4.6 5.1 — — —
None 150 4.8 4.8 5.3 —————
None 205 5.5 ———————
One 10 0.2 0.1 0.1 0.1 0.1 0.1 0.1 0.2
One 25 0.6 0.4 0.3 0.3 0.3 0.4 0.5 0.6
One 50 1.2 1.0 0.7 0.7 0.7 1.0 1.2 —
One 100 1.5 1.4 1.3 1.3 1.5 — — —
One150 1.71.51.7—————
One205 2.0———————
Two10 0.1******0.1
Two25 0.20.1****0.10.2
Two 50 0.3 0.1 * * * 0.1 0.2 —
Two 100 0.5 0.3 0.2 0.3 0.7 — — —
Two150 0.60.50.7—————
Two205 0.8———————
*BeIow ±0.05° C
–2–
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