TXN ADSL announcement.
biz.yahoo.com
Monday June 28, 8:01 am Eastern Time
Company Press Release
SOURCE: Texas Instruments Incorporated Semiconductor Group
New ADSL G.lite Codec Reduces Board Space and
Costs by Integrating High-Performance Converters and Filters
TI's xDSL Codec Family Expands with G.lite and Full-Rate ADSL Devices
DALLAS, June 28 /PRNewswire/ -- Leveraging its expertise in field-proven Asymmetrical Digital Subscriber Line (ADSL)
solutions and DSP and analog technologies, Texas Instruments (NYSE: TXN - news; TI) today introduces a highly
integrated coder-decoder (codec) for G.lite ADSL applications. Fully compliant with the International Telecommunication
Union's (ITU) G.992.2 specification for G.lite ADSL, the device allows for a simpler and more economical deployment of
ADSL in applications where the speed of full-rate ADSL is not needed. See ti.com.
The device, designated as the TLFD500, offers integrated high-performance converters and filters to improve the
performance of a G.lite modem while lowering its component count and costs. The device joins TI's growing family of xDSL
codecs and can directly interface to TI's TMS320C54x and TMS320C6x digital signal processors (DSPs) via a serial port
with no intervening glue logic -- enabling designers to further reduce component count and costs. TI's DSP core technology
has already been proven successful in TI's ADSL solutions, which deliver the programmability equipment manufacturers
need to deploy high- performance, cost-effective products in the rapidly changing, multi-service ADSL market.
''The fact that we have integrated a lot of functionality into this G.lite codec is important. But just as critical is the fact that
we've integrated high-performance functionality, including high-resolution 14-bit converters, analog and digital filters, and a
digital phase lock loop (DPLL) that by itself can reduce the bill-of-materials costs of a G.lite modem by $4 to $12,'' said
Dave Bartek, director of mixed-signal data communications products for TI. ''By integrating the 14-bit analog-to-digital
(ADC) and digital-to- analog converters (DAC), the device enables a higher data rate and an extended transmission distance
that provides an additional 2,000 to 4,000 feet in the modem's reach, which surpasses that of 12-bit codecs.''
The G.lite standard is a proposed universal specification to enable mass market Internet access and other consumer oriented
applications using ADSL technology. Customers can feel confident in designing with TI based on its proven track record in
providing market-leading DSP and analog products coupled with advanced process technologies. With a concentrated
interoperability focus believed to be essential for standards-based G.lite and G.DMT ADSL, TI is driving real-world
deployments today.
TLFD500 Improves Performance and Power Consumption at Lower Costs
ADSL modem designers are continually looking for ways to design cheaper and smaller devices. The TLFD500 provides
designers with higher signal-to- noise ratio by incorporating 14-bit converters instead of the 10- or 12-bit converters that are
typically used by other G.lite codecs. By utilizing a 14-bit converter, the device can achieve an extra 12 dB of headroom in
its signal-to-noise ratio, which gives the modem higher data communications speeds over longer distances. With the
additional resolution afforded by a 14-bit converter, designers can now increase the upstream and downstream reach of
ADSL modems.
Designed with a high level of functionality, the TLFD500 has all of the filters required in a G.lite modem integrated on-chip,
which reduces the number of board layers needed for the modem while lowering the costs associated with the system.
Besides offering integrated transmit and receive channel filters, transmit and receive attenuation, and gain, the device also has
an integrated DPLL. By integrating the DPLL into the codec, modem designers can further reduce their system costs by
using a less expensive crystal to facilitate the digital timing recovery algorithms and eliminate the need for a voltage control
oscillator. In addition, the TLFD500 operates from a 3.3V power supply and consumes less power due to the hardware and
software power-down modes.
Expanding Family of xDSL Codecs
Besides the TLFD500 G.lite codec, two new full-rate ADSL codecs from TI offer highly integrated solutions to designers of
ADSL client modems and central office (CO) line cards. Both the TLV320AD11A and the TLV320AD12A codecs fulfill
the requirements of the ITU G.992.1, the full-rate ADSL specification. The 'AD11A is designed for PC modem
applications, while the 'AD12A was developed for use in CO ADSL line cards in switches and Digital Subscriber Line
Access Multiplexers (DSLAMs). Both codecs support the eight mega-bits-per-second (Mbps) downstream speeds of
full-rate ADSL and the 800 Kbps upstream data rates.
Like the TLFD500, the 'AD11A/12A are highly integrated devices and include 14-bit ADCs and DACs, along with all of
the required transmit and receive filters, attenuation and gain filters. The 'AD11A/12A devices operate from a 3.3V power
supply and offer a hardware power down mode for power savings.
Pricing and Availability
The TLFD500 is packaged in an 80-pin thin quad flat pack (TQFP) while the TLV320AD11A and TLV320AD12A come
in 100-pin TQFPs. The TLFD500 and TLV320AD12A are available now from TI and its authorized distributors. The
TLV320AD11A is scheduled to be available during July 1999. Suggested resale pricing in quantities of 100,000 is listed in
the following table:
Device Suggested 100,000-Piece Resale Pricing (planned)
TLFD500 $9.50
TLV320AD11A $12
TLV320AD12A $11
More information on TI's telecom codec products is available on the World Wide Web at
ti.com.
All the best,
Michael |
