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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 subaudio 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.
The FX506 is a mProcessor-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/preemphasis 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 mProcessor. 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.
FX506 Maximum Ratings
Exceeding the maximum rating can result in device damage. Operation of the device outside the operating limits is not implied. Supply voltage -0.3 to 7.0V Input voltage at any pin (ref VSS = 0V) -0.3 to (VDD + 0.3V) Sink/source current (supply pins) +/- 30mA (other pins) +/- 20mA Total device dissipation @ TAMB 25°C 800mW Max. Derating 10mW/°C Operating temperature range: FX506P -30°C to +70°C (plastic) FX506LG/LS -30°C to +70°C (plastic) Storage temperature range: FX506P -40°C to +85°C (plastic) FX506LG/LS -40°C to +85°C (plastic)
FX506 Features
Full Rx and Tx Filtering to CEPT Standards Digital Control of Volume, Noise Squelch and R.S.S.I. Tx VOGAD Circuitry Serial mP Control of ALL Chip Functions Deviation Limiter
FX506 Typical Application
Military/Marine and Mobile Radio Applications FM/AM/SSB Applications 16-kbit Data and Voice Scrambler Compatible Low-Power 5-Volt CMOS Process