Motorola APX 2000, Detailed Service Manual

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Glossary Glossary
This glossary contains an alphabetical listing of terms and their definitions that are applicable to
ASTRO portable and mobile subscriber radio products. All terms do not necessarily apply to all
radios, and some terms are merely generic in nature.
Term Definition
A/D See analog-to-digital conversion.
Abacus IC A custom integrated circuit providing a digital receiver intermediate
frequency (IF) backend.
ADC See analog-to-digital converter.
ADDAG See Analog-to-Digital, Digital-to-Analog and Glue.
ALC See automatic level control.
analog Refers to a continuously variable signal or a circuit or device designed
to handle such signals.
See also digital.
Analog-to-Digital,
Digital-to-Analog
and Glue An integrated circuit designed to be an interface between the radio’s
DSP, which is digital, and the analog transmitter and receiver ICs.
analog-to-digital
conversion Conversion of an instantaneous dc voltage level to a corresponding
digital value.
See also D/A.
analog-to-digital
converter A device that converts analog signals into digital data. See also DAC.
automatic level
control A circuit in the transmit RF path that controls RF power amplifier output,
provides leveling over frequency and voltage, and protects against high
VSWR.
band Frequencies allowed for a specific purpose.
BBP See baseband interface port.
baseband interface
port Synchronous serial interface to the transceiver board used to transfer
transmit and receive audio data.
BGA See ball grid array.
ball grid array A type of IC package characterized by solder balls arranged in a grid
that are located on the underside of the package.
CODEC See coder/decoder.