DSP / Baseband

SCT3258

Low Power Baseband Processor

Low power dPMR and DMR baseband processor: 38 mW in dPMR mode, QFN64 package, works with an external codec.

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SCT3258 is a low power, high performance baseband processor supporting the dPMR and DMR protocols. With an external codec (audio band ADC and DAC), it completes the entire physical layer and data link layer, and most of the call control layer processing of dPMR and DMR protocols. In dPMR mode it complies with ETSI TS 102 490 and ETSI TS 102 658; in DMR mode it complies with ETSI TS 102 361. The firmware is held on chip — the host starts the device by downloading a small boot loader over the 8-bit HPI — which makes migration from an analogue radio design straightforward.

Key features

  • dPMR protocol engine
    • dPMR Tier 1 (ETSI TS 102 490)
    • dPMR Tier 2 (ETSI TS 102 658) Mode 1 and Mode 2
    • Full Annex A support, with BCD addressing and automatic call match
  • DMR protocol engine
    • DMR Tier 1 and Tier 2 (ETSI TS 102 361)
    • Transmit and receive in slotted or continuous mode
    • TDMA direct mode
  • 4FSK modem
    • 4800 bps for dPMR, 9600 bps for DMR
    • Two-point and I/Q modulation
    • Automatic frame sync detection, programmable modulation index
  • Built-in vocoders
    • DVSI AMBE+2™ and AMBE+2C
    • Tsinghua University ASELP 1.6 and 1.7
    • ST24, F100, and other 3600 bps low bit rate options
  • Digital and analogue PMR support
    • Automatic analogue / digital mode detection on receive
    • CTCSS / DCS generation and detection, arbitrary codes and blind detection
    • Voice channel filters, pre- and de-emphasis, compander
  • Host and peripheral interfaces
    • Two high-speed TDM serial ports for external codec and vocoder
    • 8-bit HPI host interface, Intel and Motorola modes
    • 4-pin programmable I/O
  • Low power design
    • 38 mW in dPMR mode, 64 mW in DMR mode
    • 1.2 V core, 2.5 – 3.3 V I/O

Typical applications

  • Dual mode PMR radios
  • Dual mode PMR modules
  • Analogue radio digital upgrade