Complete Baseband Processor for DECT Handsets
The SC14404 is a CMOS chip optimized to handle all the
audio, signal and data processing needed within a DECT
handset. An ADPCM transcoder, a very low power CO-
DEC and Analog Frontend is integrated. Direct connec-
tions towards microphone and a (dynamical) loudspeaker
are provided. Duplex quality handsfree operation is inte-
The SC14404 is designed to fit to any radio design.
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. 4 kilobyte F lash is integrated for parameter
and number storage.
n Integrated DECT Baseband transceiver optimized for
GAP handsets according to ETS 300 175-2, 175-3 &
n Two on board low drop voltage regulators with 2.85V
and 3.0- 3.8V (with external resistors the voltage can be
n 2V upto 3.6V battery input with onboard step up con-
n 3V upto 5.0V battery monitor input.
n Advanced battery management unit
n Very low power in active and paging mode.
n Embedded 16 bit CompactRISCTM Micro Controller.
(CR16B) with programmable clock speeds.
n 4k byte memory mapped Flash
n 320 kbyte Flash or factory programmed ROM FLASH.
n ACCESSBUSTM or MICROWIRETM interfaces
n 5,5 kilobyte on-chip Data Memory.
n One full duplex ADPCM transcoder.
n On-chip 14-bit linear CODEC.
n 14 upto 44 dB gain differential microphone input buffer.
n 100 Ω loudspeaker driver.
n Software controlled gain on audio input and output.
n Peak hold ADC for RSSI measurement.
n Five general purpose inputs can be multiplexed on an
8 bit ADC with selectable ranges.
n On-chip dedicated TDMA instruction co-processor
which supports 1.152 MHz, 0.576 MHz and 0.288 MHz
n Seven programmable control signals for radio front
n Full and double slot, protected and unprotected B-
n Duplex quality handsfree operation.
n Tone generator. Tones consisting of 3 frequencies can
n Linear PCM interface for external codec.
Note: ACCESSBUST M, MICROWIRET M and CompactRISCT M are trade-
marks of National Semiconductor Corporation.
Copyright 2000 National Semiconductor Corp.