SC14425 Datasheet | National Semiconductor

Description The SC14425SC14425 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 SC14425 has an on-chip dedicated flexible DSP optimized for tele applications caller-id, handsfree and allows easy connection to digital telephone answering machine devices. The SC14425 is designed to be patible 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 µ-Law, a-Law, linear or transparent data formats. n 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. n Two full duplex 32 kbits/sec ADPCM transcoder. n On-chip Dedicated Instruction Processor (Di P) for all TDMA based events, which supports 1.152MHz, 0.576MHz and 0.288MHz data rates. n Protected and unprotected full and double slot B-fields n Standard DECT encryption with different keys for different MAC-connections. n At least 6 MAC connections can be handled simultaneously. n Flexible three wire interface to radio front synthesizer. n One 14-bit linear CODEC with programmable gain n Peak hold ADC for RSSI measurement n Two input 8 bit successive approximation ADC. n Three general purpose I/O ports with programmable interrupts n Full duplex UART, SPI T M and MICROWIRE T M interface. n Flexible 8 k Hz synchronous Serial interface to external...