FX506 Datasheet, PDF (1/17 Pages) Sanyo Semicon Device – High-Current Switching Applications

CML Semiconductor Products
PRODUCT INFORMATION
FX506 Mobile Radio Audio Processor
Features/Applications
Full Rx and Tx Filtering to
CEPT Standards
Digital Control of Volume,
Noise Squelch and R.S.S.I.
Tx VOGAD Circuitry
Serial µP Control of ALL Chip
Functions
Deviation Limiter
Publication D/506/3 July 1994
Military/Marine and Mobile
Radio Applications
FM/AM/SSB Applications
16-kbit Data and Voice Scrambler
Compatible
Low-Power 5-Volt CMOS
Process
Rx
RECEIVER
CTCSS and DATA
Tx AUDIO
MIC.1
MIC.2
Tx
EXTERNAL AUDIO
PROCESSES
AUDIO
4.0MHz
RSSI
REF.
MODULATION
TRANSMITTER
FX506
VCO
Single-Chip
Audio Processor
PA
SQUELCH/CARRIER
DETECT
HIGH
SQUELCH
LOW
SERIAL
BUS
SYSTEM
UP
µP
VOLUME
DOWN
FX506
Brief Description
The FX506 is a µProcessor-controlled, single-chip
device containing ALL the circuit elements necessary
to perform the audio functions of a mobile (or portable)
radio system.
On-chip signal paths include: speech-band/pre-
emphasis filters, variable gain/attenuation stages,
voice-compression and deviation limiter circuitry.
Each function in the signal path can be addressed or
by-passed –– providing “real-time,” dynamic control ––
by the µProcessor. This half-duplex device comprises
two separate audio signal paths.
The Pre-Process Path performs filtering and level
adjustment on audio (Rx or Tx) for use in auxiliary
systems such as “Frequency Inversion Scrambling,”
“Sub-Audio” tone or “In-Band” data signalling. This path
is output at the “Pre-Process Audio Output” pin. If no
external processes are being used this output should
be connected to the “Pre-process Audio Input” pin.
The Post-Process Path can adjust and prepare
the input audio for output to the chosen transmitter
driver or loudspeaker amplifier.
Suitably software configured, the FX506, which can
operate on voice, direct-digital or tone-data and sub-
audio frequencies, is compatible with FM, AM and
SSB type transceivers. Digital gain elements are
provided on-chip for dynamic control and balance of
signal-path levels during manufacturing, test and
operation.
System Squelch, a separate path, is sourced from
either the incoming signal or Received Signal
Strength Indication (R.S.S.I.) from the radio circuitry.
The FX506, a low-power 5-volt CMOS device, is
available in 24-pin/lead plastic DIL and SMD
packages.