SC14425

 Integrated DECT base band transceiver optimized for GAP base stations according to ETS 300 175-2,3 & 8.
2.7 to 3.3 Volt operating voltage.
 Embedded 16 bit CompactRISCTM CR16B Microprocessor with In System Emulation (ISE) mode.
 On-chip 6kByte Data Memory.
 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.
Two full duplex 32 kbits/sec ADPCM transcoder.
On-chip Dedicated Instruction Processor (DiP) for all TDMA based events, which supports 1.152MHz, 0.576MHz and 0.288MHz data rates.
Protected and unprotected full and double slot B-fields
Standard DECT encryption with different keys for different MAC-connections.
 At least 6 MAC connections can be handled simultaneously.
 Flexible three wire interface to radio front synthesizer.
 One 14-bit linear CODEC with programmable gain
 Peak hold ADC for RSSI measurement
 Two input 8 bit successive approximation ADC.
 Three general purpose I/O ports with programmable interrupts
 Full duplex UART, SPITM and MICROWIRETM interface.
 Flexible 8 kHz synchronous Serial interface to external codecs and ISDN interface circuits.
 Two general purpose timers and watch dog timer.
 Programmable chip selects to 8 bit wide ROM, SRAM NAND Flash Memory and I/O expanders.
 Two Capture timers for frequency measurement for e.g. metering, ringing and call progress tone detection.
 100 pin TQFP-100 package.

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 telecom applications caller-id, handsfree and allows easy connection to digital telephone answering machine devices.

The SC14425 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.