GENERAL DESCRIPTION
An ADPCM transcoder, a very low power CODEC and Analog Frontend is integrated. Direct connections towards microphone and a (dynamical) loudspeaker are provided. Duplex quality handsfree operation is integrated. A dedicated TDMA controller handles all physical layer slot formats and radio control. National Semiconductors standard CompactRISCTM CR16B 16 bit microcontroller takes care of all the higher protocol stack. I Embedded 16 bit CompactRISCTM Micro Controller. (CR16B) with programmable clock speeds. I 384 kbyte Flash. I ACCESSBUSTM or MICROWIRETM interfaces I 6 kilobyte on-chip Data Memory. I One full duplex ADPCM transcoder. I On-chip 14-bit linear CODEC. I 14 upto 44 dB gain differential microphone input buffer. I 80 Ω loudspeaker driver. I Software controlled gain on audio input and output. I Peak hold ADC for RSSI measurement. I Five general purpose inputs can be multiplexed on an 8 bit ADC with selectable ranges. I On-chip dedicated TDMA instruction co-processor which supports DECT and ISM-bands providing 1.152 Mb/s, 1.024 Mb/s, 0.576 Mb/s, 0.512 Mb/s, 0.288 Mb/s and 0.256 Mb/s.
National Semiconductor
