SC14408
May 2001
V 1.0
SC14408
Complete Baseband Processor for DECT Handsets
General Description
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 CompactRISC
TM
CR16B 16 bit microcontroller takes care of all the higher
protocol stack.
I
Embedded 16 bit CompactRISC
TM
Micro Controller.
(CR16B) with programmable clock speeds.
I
384 kbyte Flash.
I
ACCESSBUS
TM
or MICROWIRE
TM
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
end.
I
Full and double slot, protected and unprotected B-
fields.
I
Duplex quality handsfree operation.
I
Tone generator. Tones consisting of 3 frequencies can
be programmed
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: ACCESSBUS
TM
, MICROWIRE
TM
and CompactRISC
TM
are trade-
marks of National Semiconductor Corporation.
Features
I
Integrated DECT Baseband transceiver optimized for
GAP handsets according to ETS 300 175-2, 175-3 &
175-8.
I
Two on board low drop voltage regulators with 2.5V and
3.0- 3.8V (with external resistors the voltage can be de-
termined) output.
I
2V upto 3.6V battery input with onboard step up con-
verter.
I
Advanced battery management unit
I
Very low power in active and paging mode.
________________________________________________________________________________________________
System Diagram
© 2001 National Semiconductor Corporation
1
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