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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

CR16B 16 bit microcontroller takes care of all the higher

protocol stack.

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.

(CR16B) with programmable clock speeds.

I 384 kbyte Flash.

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)

marks of National Semiconductor Corporation.

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System Diagram

V 1.0

May 2001

© 2001 National Semiconductor Corporation

www.national.com