Voltage References

COMPONENT SUPPLIERS
QUARTZ CRYSTALS - FREQUENCY CONTROL:
California Crystal Laboratories (800) 333-9825
Fox Electronics (813) 693-0099
International Crystals (405) 236-3741
Standard Crystal Corporation (818) 443-2121
GENERAL COMPONENTS - PROTOTYPE QUANTITIES - ASSEMBLY MATERIAL -
PC BOARD MATERIAL:
Digi-Key Corporation
Radio Shack Division,
Tandy Corporation
(800) 344-4539
(See local telephone directory)
INDUCTORS, COILS, RF TRANSFORMERS, FIXED AND VARIABLE:
CoilCraft (800) 322-COIL
(708) 639-6400
Toko America, Inc.
(708) 297-0070
CERAMIC FILTERS AND RESONATORS, IF FILTERS - AM AND FM TYPES:
muRata Erie (404) 436-1300 (Todd Brown, Harry Moore)
TDK Corporation of America (708) 803-6100
Toko America, Inc. (708) 297-0070
BREADBOARDING
Breadboarding RF or other high speed analog circuits can be a very frustrating process for the newcomer
or even an experienced digital deSigner. Most of these circuits deal with very high gain (100+ dB), very
small signals (less than a few microvolts), or with very high frequencies where a wavelength may be a
fraction of a meter. Once "friendly" 0.1 IlF capacitors may now be inductors due to their parasitic
inductance, and conventional construction methods may yield only circuits that oscillate.
What to avoid (never use these):
- Wire wrap for RF or high frequency breadboards.
- Conventional push-in prototype boards.
- Digital printed protoboards with ground and power supply bus lines.
What to use:
- Carefully laid-out double-sided groundplane PC boards.
- Grid boards with a background plane.
- Single-sided PC layouts with continuous full ground fill.
- High frequency qualified components.
- Adequate decoupling.
You will find recommended PC layouts for most of the communications circuits in this chapter. These
layouts are strongly recommended as starting points for new designs. They will allow you to develop your
own benchmark standard circuit to be used as a standard of comparison during further design iterations.
Many Motorola communications ICs have supporting development kits which include a PC board. These
boards are meant to provide performance equivalent to the data sheets specifications and are easy to
modify for other uses but these boards, however, are not optimized or intended for production applications.
Contact your Motorola sales office or Motorola distributor for information on the availability of these
development kits.
MOTOROLA LlNEARIiNTERFACE ICs DEVICE DATA
8-182