User's Manual

XXXXXXXX Rev X
LA-5127 CF card Integration Guide
Copyright 2004 Symbol Technologies, Inc. Page 33 of 37
Confidential Material – Disclosure Strictly Prohibited.
MTBF (Min) FITs (Max) Product Duty Cycle
25,000 40,000 100%
50,000 20,000 50%
125,000 8,000 20%
The above is for Temp = 40°C and 50% electrical stress.
11. Recommended Design Considerations
The following items are recommended for design consideration and integration of
the LA-5127:
1. Design and place the antenna (in the external antenna version) to
minimize the coupling back to the radio.
2. Locate the antenna to maintain the VSWR during normal use.
3. Consider human usage factors in placing the antenna/device in the
product.
4. Ensure power supply requirements are met and pay special attention to
turn-on/turn-off transients.
5. Assure that requirements are met as battery discharges.
6. Assure that radio is not subjected to temperatures exceeding its
specifications.
7. Radio temperature specification is based on free air – must be de-rated
based on internal temperature rise.
8. Assure that shock, vibration, etc. specifications are not exceeded as
mounted.
9. Assure that the mechanical design does not put pressure on the module
when mounted.
10. Ensure all operating and environmental conditions are met by design such
that the LA5127 is operating within the envelope of its operating
environment as specified in paragraph 2.2.3.1 herein.
11. The radiated EVM of the LA-5127 is dependent upon the coaxial cable
type, coaxial cable length, and the antenna VSWR. Even though an
antenna may meet the 2:1 VSWR specification, care must be taken to
select a coaxial cable type and length so that the desired radiated EVM
limits are met. Often, the length can be adjusted to optimize the radiated
EVM, with changes as small as .25 inch having measurable effects.
12. Appendix 1: EVM Degradation vs. Antenna VSWR
TBD.