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


Application

Military/Marine and Mobile Radio Applications
FM/AM/SSB Applications
16-kbit Data and Voice Scrambler Compatible
Low-Power 5-Volt CMOS Process


Specifications

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 V_SS = 0V)                -0.3 to (V_DD + 0.3V)
Sink/source current (supply pins)                          +/- 30mA
(other pins)                                                           +/- 20mA
Total device dissipation @ T_AMB 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)


Description

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 of FX506 include: speech-band/preemphasis filters, variable gain/attenuation stages, voice-compression and deviation limiter circuitry.

Each function in the signal path of FX506 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 of FX506 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.