Copyright 1998 National Semiconductor Corp.

1

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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

CR16A 16 bit microcontroller with external ROM takes

care of all the higher protocol stack.

Features

s Integrated DECT Baseband transceiver optimized for

GAP handsets according to ETS 300 175-2, 175-3 &

175-8.

s 2.95 to 3.6 Volt operating voltage.

s Very low power in active and paging mode.

s Max 5V battery input.

(CR16A) with programmable clock speeds.

handled.

s 4 kByte on-chip Data Memory.

s One full duplex ADPCM transcoder.

s On-chip 14-bit linear CODEC.

s 8 upto 38 dB gain differential microphone input buffer.

s 100

Ω loudspeaker driver.

s Software controlled gain on audio input and output.

s On-chip gaussian Modulator.

s Peak hold ADC for RSSI measurement.

s Three general purpose inputs can be multiplexed on an

8 bit ADC with selectable ranges.

s Advanced battery management unit

s On board dedicated TDMA instruction co-processor

(DiP).

s Eight programmable control signals for radio front end.

s Serial interface to control radio front end circuitry.

s Full support of all data formats.

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System Diagram

SC14401

SC14402

SC14401

4220030

SC14402

SC14402

SC14422

PSTN

ISDN

ISDN or

PSTN

Interface

PRELIMINARY

February 1998