New 'C2000 DSPs provide best price/performance ratio in industry Revolutionary 'C27x architecture combines the best of DSP and MCU technologies Celebrating 10 years of floating-point DSP excellence (1988-1998) New TMS320 applications make DSP development easier TI's C54x family extends reach from low cost to high performance Experience power-efficient performance with 100-MIPS 'C549 ICASSP show salutes 50th anniversary of IEEE Registration opes for DSPS Fest '98 Quad codec-filter combo brings multi-channel capabilities to CO line cards New Third-Party Hardware & Software TI leads the digital age of electronics with strategic acquisitions and alliances |
Quad codec-filter combo brings multi-channel capabilities to CO line cardsTI’s latest innovation in mixed-signal technology is a highly integrated pulse-code-modulated (PCM) codec-filter combo that supports four channels on a single chip.The device, TCM38C17 QCombo™, complements TI’s existing advanced DSP-interface codec solutions in the central office (CO) switching and modem product areas. It incorporates the industry’s leading idle-channel noise performance resulting from sigma-delta analog-to-digital (A/D) and digital-to-analog (D/A) signal con-version, a unique feature among today’s non-programmable combos. The QCombo’s architecture is expected to be reused in many future advanced codec designs from TI. Low cost, low noise, low powerThe ’C17 QCombo brings lower cost, extremely low noise, and low power consumption to a wide variety of applications that connect analog voiceband signals to digital communications systems. Among these appli-cations are line cards, private branch exchanges, and digital telephone answering devices.The ’C17 QCombo integrates the functionality of four TI TCM29C13 combos on a single device, lowering chip counts and reducing costs for original equipment manufacturers. The device provides increased voice and data line card capacity over the existing voiceband telecommunications infrastructure. This increased line card channel capacity is key for future voice and data transmission protocols over twisted-pair systems such as digital subscriber line (DSL). The ’C17 QCombo typically displays transmit-channel idle channel noise of 10 dBrnC0/-80 dBm0p or better. Inter-channel crosstalk, a potential concern for a multichannel codec, is typically less than -100 dB. The Qcombo gives designers the flexibility to use single-ended or differential receiver output, allowing maximum voltage swings of 8 V PP . This eliminates the need for external amplification and allows direct connection to a transformer. The device requires only a single-rail +5-V power supply, contributing to low-power consumption and eliminating the need for the second power supply required by first-generation combos. A differential output drives a transformer load directly and pro-vides an extremely wide signal swing from a single-rail codec. ITU standards complianceThe QCombo’s compliance with ITU standards assures virtually universal interoperability in line cards and other equipment with functions per-formed by the device.The QCombo is now available from TI and its authorized distributors.
 TI’s ’C17 Qcombo. TI’s TCM38C17 Qcombo provides multi-channel capability with negligible crosstalk, large voltage swing, and idle-channel noise. |