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FROM EDN EUROPE: ADSL analogue chips pack in channels, cut power
-- EDN, 3/1/2001
LSI Logic has extended its offering in analogue ADSL chip sets at both ends of the local loop. Having recently announced its AR8101 and 8201 analogue-front-end chips for the customer-premises end of the loop, it has now introduced the SpeedReach AC8200 AFE for the exchange/central-office end (Picture). The 8101 and 8201 allow you to build 5V-only designs that nevertheless drive a 10V signal swing into 600W, employing a transformer design that is fully specified by LSI Logic. The chip sets offer low noise; at –160 dBm, the receiver amplifier generates less noise than the copper wire. They also offer linearity, yielding effective 14-bit performance. At the central-office end of the loop, the equation is about fitting as many ADSL channels as possible into a given form factor and power budget, and the 8200 is an octal device. It occupies 7 cm2 per port for a power budget of 150 mW/channel. AC8200 is both full-rate and G.Lite-compliant, and you can use it for both ADSL-over-POTS and ADSL-over-ISDN connections.
—by Graham Prophet
This article ran on page 16 of the March 1, 2001 issue of EDN.
