Caelera introduces a new line of PMR audio processors recently added by CML Microcircuits to their family of analogue two-way radio ICs.
The new CMX148 audio scrambler and sub-audio signalling processor are designed for use in general leisure and professional PMR terminals in a global market.
CMX148A audio and data processors are half-duplex devices that utilise the host µC to perform signalling including CTCSS/DCS encoding and decoding.
Particularly suited to both the PMR markets and enhanced MURS/GMRS/FRS with GPS terminal designs, the IC features an FFSK/MSK data modem for packetised or free-format data operations.
Key features of CMX148A audio processors:
- Signal routing and filtering to assist host µC-based signalling encode/decode applications
- DTMF encoder/decoder
- Auxiliary ADCs and DACs
- Dual synthesised clock outputs
- Operates on 3.3V supply and includes selectable power-saving modes
- Available in 48-pin VQFN and LQFP packages
Signal processing blocks can be individually assigned to either of two signal-processing paths, which, in turn can be routed from any of the three audio/discriminator input pins.
This allows for a very flexible routing architecture and permits different processing blocks to act on different analogue inputs.
The EV1480 Evaluation Kit is designed to assist in the evaluation and application development of the CMX148 PMR audio and data processors.
The kit is in the form of a populated PCB comprising a CMX148 IC and appropriate supporting components, incorporating all necessary power-supply regulation facilities for operation from a single 5-volt supply.