Complete Baseband Processor for DECT Handsets
The SC14408 is a CMOS chip optimized to handle all the
audio, signal and data processing needed within a DECT
(1.9GHz) or in the 2.4GHz ISM digital band handset. An
ADPCM transcoder, a very low power CODEC and Ana-
log Frontend is integrated. Direct connections towards mi-
crophone and a (dynamical) loudspeaker are provided.
Duplex quality handsfree operation is integrated.
The SC14408 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
I Integrated DECT Baseband transceiver optimized for
GAP handsets according to ETS 300 175-2, 175-3 &
I Two on board low drop voltage regulators with 2.5V and
3.0- 3.8V (with external resistors the voltage can be de-
I 2V upto 3.6V battery input with onboard step up con-
I Advanced battery management unit
I Very low power in active and paging mode.
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.
I Seven programmable control signals for radio front
I Full and double slot, protected and unprotected B-
I Duplex quality handsfree operation.
I Tone generator. Tones consisting of 3 frequencies can
I Linear PCM interface for external codec.
I ISM band support with 8/9 x 10.368 Mc xtal = 9.216 Mc
I On chip LCD controller (6X30 segments)
Note: ACCESSBUSTM, MICROWIRETM and CompactRISCTM are trade-
marks of National Semiconductor Corporation.
© 2001 National Semiconductor Corporation