SC14425AVV

The SC14425AVV is one of The SC14425 series. The SC14425AVV is a 3.3 Volt CMOS IC optimized to handle all the audio, signal and data processing needed within a DECT base station. An ADPCM transcoder, a very low power 14 bit Codec and Analog Frontend are integrated.Direct connections towards analog or ISDN line interface.The SC14425AVV has an on-chip dedicated flexible DSP optimized for telecom applications caller-id, handsfree and allows easy connection to digital telephone answering machine devices.The SC14425AVV is designed to be compatible with many radio interfaces. A dedicated TDMA controller handles all physical layer slot formats and radio control. The integrated National Semiconductor's standard CR16B processor core takes care of all the higher protocol stack. Programmable I/O ports can be configured as chip selects for I/O expanders, Serial Flashes, interrupt source or I/O. A digital serial interface can be configured to interface to industry-standard c odecs and ISDN devices with m-Law, a-Law,linear or transparent data formats.

Features of the SC14425AVV are:(1)Integrated DECT base band transceiver optimized for GAP base stations according to ETS 300 175-2,3 & 8.;(2)2.7 to 3.3 Volt operating voltage.;(3)Embedded 16 bit CompactRISCTM CR16B Microprocessor with In System Emulation (ISE) mode.;(4)On-chip 6kByte Data Memory.;(5)Embedded flexible dedicated DSP executing Caller-id(CID), Caller-id on Call Waiting (CIDCW) and handsfree,two echo cancellers, two echo suppressors, extended DTMF detection, DTMF generation, sidetone and artificial echo loss.;(6)Two full duplex 32 kbits/sec ADPCM transcoder.;(7)On-chip Dedicated Instruction Processor (DiP) for all TDMA based events, which supports 1.152MHz,0.576MHz and 0.288MHz data rates.;(8)Protected and unprotected full and double slot B-fields;(9)Standard DECT encryption with different keys for different MAC-connections.;(10)At least 6 MAC connections can be handled simultaneously.(11)Flexible three wire interface to radio front synthesizer.(12)One 14-bit linear CODEC with programmable gain.(13)Peak hold ADC for RSSI measurement(14)Two input 8 bit successive approximation ADC.(15)Three general purpose I/O ports with programmable interrupts(16)Full duplex UART, SPITM and MICROWIRETM interface.(17)Flexible 8 kHz synchronous Serial interface to external codecs and ISDN interface circuits.(18)Two general purpose timers and watch dog timer.(19)Programmable chip selects to 8 bit wide ROM, SRAM NAND Flash Memory and I/O expanders.(20)Two Capture timers for frequency measurement for e.g. metering, ringing and call progress tone detection.(21)100 pin TQFP-100 package.