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CMX7161 TDMA Digital Radio Processor from CML


CML Microcircuits at CDI
CMX7161 TDMA Digital Radio Processor from CML
Available at CDI
CML, TDMA, Digital Radio Processor, CMX7161, at CDICDI announces the CMX7161 FI-1.x, a half-duplex digital radio modem intended for use in two-slot TDMA systems such as the ETSI TS 102 361 standard for Digital Mobile Radio (DMR). It uses root-raised-cosine (alpha 0.2) 4-FSK modulation in a 12.5kHz channel. Slot timing and synchronization are handled automatically by the device.An integrated analogue interface supports connection to a direct conversion receiver such as the CML CMX994 and two-point modulation transmitter with few external components; no external codecs are required.

Intelligent auxiliary ADC, DAC and GPIO sub-systems are provided to minimize required host interaction and host I/O resources. Two synthesized system clock generators develop clock signals for off-chip use. The C-BUS/SPI master interface expands host C-BUS/SPI ports to control external devices.

The CMX7161 operates from a 3.3V supply and is available in 64-pin VQFN and LQFP packages. Click here to contact CDI for more information on ordering the CMX7161.
  • ETSI TS 102 361 Digital Mobile Radio (DMR)
  • Police Digital Trunking (PDT) Radio
Tx Functions: Rx Functions:
  • Two-point modulation analogue outputs
  • Root-raised-cosine (alpha 0.2) pulse shaping
  • RAMDAC capability for PA ramping control
  • Tx trigger feature allowing precise control of burst start time
  • Tx burst sequence for automatic RAMDAC ramping and hardware switching
  • I/Q analogue inputs
  • Rx channel filtering and root-raised-cosine (alpha 0.2) pulse shaping
  • Data returned as hard-decision bits or 4-bit soft-decision LLR metrics
  • Automatic frame sync detection
  • Automatic tracking of symbol timing and input I/Q DC offsets
  • RSSI detection
Slot Timing Functions: Auxilary Functions:
  • 30ms slot format (264-bit bursts)
  • Internal slot clock and timing maintenance
  • Automatic synchronization to received channel
  • Automatic sequencing of hardware control
  • Two programmable system clock outputs
  • Four auxiliary ADCs with six selectable input paths
  • SPI Thru-Port for interfacing to synthesizers and other serial-controlled devices
  • Four auxiliary DACs, one with built-in programmable RAMDAC
Host Interface:
  • Optimized C-BUS (4-wire, high speed synchronous serial command/data bus) interface to host for control and data transfer, including streaming C-BUS for efficient data transfer
  • Open drain IRQ to host
  • Four GPIO pins
  • Serial memory or C-BUS (host) boot mode.
Get More Details:
Click here to visit CML Microcircuits at
Click here to submit a technical inquiry
or call CDI toll-free at: 1-800-777-7334