描述 Description

General Description
The SC14405 is a CMOS chip optimized to handle all the audio, signal and data processing needed within a DECT handset. An ADPCM transcoder, a very low power CO DEC and Analog Frontend is integrated. Direct connections towards microphone and a (dynamical) loudspeaker are provided. Duplex quality handsfree operation is integrated.

特性 Features

■ Integrated DECT Baseband transceiver optimized for GAP handsets according to ETS 300 175-2, 175-3 & 175-8.
■ Two on board low drop voltage regulators with 2.85V and 3.0- 3.8V (with external resistors the voltage can be determined) output.
■ 2V upto 3.6V battery input with onboard step up converter.
■ 3V upto 5.0V battery monitor input.
■ Advanced battery management unit
■ Very low power in active and paging mode.
■ Embedded 16 bit CompactRISCTM Micro Controller.
? (CR16B) with programmable clock speeds.
■ 4k byte memory mapped Flash
■ 128 kbyte Flash or factory programmed ROM FLASH.
■ 125 segment LCD controller using 5 backplanes
■ ACCESSBUSTM or MICROWIRETM interfaces
■ 5,5 kByte on-chip Data Memory.
■ One full duplex ADPCM transcoder.
■ On-chip 14-bit linear CODEC.
■ 14 upto 44 dB gain differential microphone input buffer.
■ 100 W loudspeaker driver.
■ Software controlled gain on audio input and output.
■ Peak hold ADC for RSSI measurement.
■ Five general purpose inputs can be multiplexed on an 8 bit ADC with selectable ranges.
■ On-chip dedicated TDMA instruction co-processor which supports 1.152 MHz, 0.576 MHz and 0.288 MHz bit rates..
■ 7programmable control signals for radio front end.
■ Full and double slot, protected and unprotected Bfields.Duplex quality handsfree operation.
■ Tone generator. 3 parallel tones can be programmed
■ Linear PCM interface for external codec.
■ Four general purpose ports. Three as input/output, one as output only.
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