Ok. But what's your take on this ?
biz.yahoo.com
Analog Front End for ADSL From TI Cuts Chip Count in Half and
Reduces Power Consumption By 20 Percent
Eight-Channel Codec and Driver/Receiver Pave the Way for Higher Line Densities In DSLAMs and DLCs
DALLAS, Feb. 7 /PRNewswire/ -- A new analog front end (AFE) solution from Texas Instruments Incorporated (TI) (NYSE: TXN - news) for
asymmetric digital subscriber line (ADSL) central office (CO) systems, such as DSL access multiplexers (DSLAMs) or digital loop carriers (DLC),
enables designers to increase the DSL line card density from four or eight to 16, 24 or 32 channels, saving floor space for DSL service providers. At
the same time, significant power consumption reductions of 20 percent will keep CO DSL systems running cooler and within their overall power
budgets. (See www.ti.com/sc/aap5578u.)
Building on TI's track record as the leader in analog and DSL technology, the new AFE solution includes the TLV320AD15, an eight-channel codec
with 14-bit converters and a separate driver/receiver device, the THS7102/3, for either DSL over POTS (Plain Old Telephone Service) or DSL over
ISDN (Integrated Services Digital Network) lines. By combining the high speed line driver and receiver amplifiers on the same chip and integrating
several gain resistors, filters and other passive components, TI's AFE solution will, at a minimum, cut in half the number of discrete devices previously
needed on a DSL line card.
``DSL deployment is shifting into high gear in the marketplace,'' said Art George, director for TI's high performance linear products. ``Equipment
manufacturers are being pressed to increase the line densities of their CO systems so that DSL service providers can sign up more subscribers without
having to expand the floor space of their facilities. At the same time, it is essential that chip suppliers reduce power consumption so that these denser
line cards can operate within a normal temperature range.''
The chips in TI's solution support both G.lite and full-rate discrete multi-tone (DMT) asymmetrical DSL (ADSL). The TLV320AD15 codec will
operate from either a single 3.3 volt (V) or a 3.3V and 1.5V supply for further power reduction. Each channel of the codec can be powered down
individually to reduce power consumption and heat dissipation. The TLV320AD15 has separate serial interfaces for each channel of the codec for data
transfer and one to transfer control information for ease in board layout.
The THS7102 line driver/receiver supports DSL over POTS lines, while the THS7103 is designed for DSL over ISDN. Power consumption has been
reduced from 1.5 Watts per channel for previous generation drivers and receivers to just 1.1 Watts per channel for the new driver/receiver device.
With an operating temperature range of -40 to 85 degrees Centigrade, both the TLV320AD15 and the THS7102/3 can be used in DLC systems that are
deployed in cabinets in the field.
Integrated Line Driver/Receivers
The THS7102/3 line drivers/receivers are standalone devices, as is the TLV320AD15, and can be used separately or implemented as a complete analog
front end solution for lowest power and maximum performance. The THS7102 and THS7103 include a low power differential receiver, a low power
active termination differential line driver, integrated transmit filters, integrated receive filters and integrated transmit/receiver gain resistors.
TI's active termination, or synthesized impedance, line driver technology is an evolutionary step in DSL line driver technology. It virtually eliminates
the matching resistors that were previously required to terminate the line, and wasted as much as 50 percent of the line driver power. In addition, since
removal of the matching resistors reduces the output voltage requirements of the line driver, the THS7102/3 can operate off of just one +15V power
supply while driving full rate downstream ADSL DMT signals. The devices also feature variable bias current that can be used to adjust the power
consumption of the device or place it into a low-impedance shutdown mode, which will maintain proper termination of the line while the device is
turned off.
Pricing, Packaging and Availability
The TLV320AD15 comes in a compact 240-ball MicroStar(TM) ball grid array (BGA). The THS7102/3 are packaged in either a small 80-ball
MicroStar Junior(TM) BGA or a 32-pin PQFP PowerPAD(TM) package.
The TLV320AD15 and THS7102/3 are sampling now to select customers with volume production planned during the first quarter of 2001. Planned
pricing in quantities of 100,000 is $52 for the TLV320AD15 codec, and $5.59 in quantities of 100,000 for the THS7102 and THS7103. |
