SC14402 C
omplete Baseband Processor for DECT Handsets
PRELIMINARY
February 1998
SC14402
Complete Baseband Processor for DECT Handsets
General Description
Preliminary document version 1.5.
The SC14402 is a 3.0 Volt CMOS chip optimized to handle
all the audio, signal and data processing needed within a
DECT handset. An ADPCM transcoder, a very low power
CODEC and Analog Frontend is integrated. Direct con-
nections towards microphone and a (dynamical) loud-
speaker are provided.
The SC14402 is designed such that it is compatible with
many radio interfaces.
A dedicated TDMA controller handles all physical layer
slot formats and radio control.
National Semiconductors standard CompactRISC
TM
CR16A 16 bit microcontroller with external ROM takes
care of all the higher protocol stack.
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2.95 to 3.6 Volt operating voltage.
Very low power in active and paging mode.
Max 5V battery input.
Embedded 16 bit CompactRISC
TM
Micro Controller.
(CR16A) with programmable clock speeds.
ACCESSBUS
TM
or MICROWIRE
TM
interfaces can be
handled.
4 kByte on-chip Data Memory.
One full duplex ADPCM transcoder.
On-chip 14-bit linear CODEC.
8 upto 38 dB gain differential microphone input buffer.
100
鈩?/div>
loudspeaker driver.
Software controlled gain on audio input and output.
On-chip gaussian Modulator.
Peak hold ADC for RSSI measurement.
Three general purpose inputs can be multiplexed on an
8 bit ADC with selectable ranges.
Advanced battery management unit
On board dedicated TDMA instruction co-processor
(DiP).
Eight programmable control signals for radio front end.
Serial interface to control radio front end circuitry.
Full support of all data formats.
Features
s
Integrated DECT Baseband transceiver optimized for
GAP handsets according to ETS 300 175-2, 175-3 &
175-8.
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System Diagram
SC14401
SC14402
SC14422
ISDN or
PSTN
Interface
PSTN
ISDN
SC14401
SC14402
SC14402
4220030
ACCESSBUS
TM
, MICROWIRE
TM
and CompactRISC
TM
are trademarks of National Semiconductor Corporation.
Copyright 1998 National Semiconductor Corp.
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