AM79D2251 Datasheet | Advanced Micro Devices

Intelligent Access™ Voice Solutions .. Dual Intelligent Subscriber Line Audio-Processing Circuit (ISLAC) DISTINCTIVE CHARACTERISTICS s High performance digital signal processor provides programmable control of all major linecard functions - 32 and 24 kb/s ADPCM to G726, as well as A-law/µ-law and linear codec - Transmit and receive gain - Two-wire AC impedance - Transhybrid balance - Equalization - DC loop feeding - Smooth or abrupt polarity reversal - Loop supervision - Off-hook debounce circuit - Ground-key and ring-trip filters - Ringing generation and control - Adaptive hybrid balance - Line and circuit testing - Tone generation - Metering generation at 12 k Hz and 16 k Hz - Envelope shaping and level control s Selectable PCM/MPI or GCI digital interfaces - Supports most available master clock frequencies from 512 k Hz to 8.196 MHz s 0 to 70°C mercial operation - - 40°C to 85°C extended temperature range available s +3.3 V DC operation s Exceeds LSSGR and ITU requirements s Supports external ringing with on-chip ring-trip circuit - Automatic or manual ring-trip modes s DTMF detection according to Q.24 s 2100 Hz modem tone detection according to V.25 BLOCK DIAGRAM A1 ISLIC 7 4 LD1 VREF VCCA VCCD DGND1 B1 RC Networks and Protection A2 7 3...