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AD2S44-SM10B View Datasheet(PDF) - Analog Devices

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AD2S44-SM10B Datasheet PDF : 12 Pages
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AD2S44
Ka does not define maximum acceleration; it defines only the
error due to acceleration. The maximum acceleration of which
the AD2S44 keeps track is approximate to 5 × Ka = 310,000°/sec2
or about 800 revolutions/sec2.
Ka can be used to predict the output position error due to input
acceleration. For example, an acceleration of 50 revolutions/sec2
with Ka = 62,000 is calculated using the following equation:
LSB
Input Acceleration 
Errors in LSBs =
sec2  =
[ ] Ka sec2
50
rev
×
214
LSB

 sec2 
 rev  = 13.2 LSBs
[ ] 62,000 sec2
RELIABILITY
The reliability of these products is very high due to the extensive
use of custom chip circuits that decrease the active component
count. Calculations of the MTBF figure under various environ-
mental conditions are available upon request from Analog
Devices.
Figure 9 shows the MTBF in years vs. case temperature for
Naval Sheltered conditions calculated in accordance with the
Mil-Hdbk-217E.
100
Data Sheet
PROCESSING FOR HIGH RELIABILITY (B SUFFIX)
As a part of the high reliability manufacturing procedure, all
converters receive the processing shown in Table 6.
Table 6.
Process1
Precap Visual Inspection
Temperature Cycling
Constant Acceleration
Interim Electrical Tests
Operating Burn In
Seal Test, Fine and Gross
Final Electrical Test
External Visual Inspection
Conditions
MIL-STD-883, Method 2017
10 cycles, –65°C to +150°C
5000 Gs, Y1 plane
@ 25°C
160 hours @ 125°C
MIL-STD-883, Method 1014
Performed at TMIN, TAMB, TMAX
MIL-STD-883, Method 2009
1 Test and screening data supplied by request.
OTHER PRODUCTS
Analog Devices manufactures many other products concerned
with the conversion of synchro/resolver data, such as the
SDC/RDC1740 series and the AD2S80A series.
Hybrid
The SDC/RDC1740 is a hybrid synchro/resolver-to-digital
converter with internal isolating micro transformers.
Monolithic
The AD2S80A series are ICs performing resolver-to-digital
conversion with accuracies up to ±2 arc minutes and 16-bit
resolution.
10
1
25
45
65
85
105
125
TEMPERATURE (°C)
Figure 9. MTBF vs. Temperature
Rev. B | Page 10 of 12
 

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