DSL line driver amp

24 November 2010 Analogue, Mixed Signal, LSI

Analog Devices has introduced a dual-port DSL line driver Class H amplifier for designers of high-speed ADSL2+/VDSL2 line cards. The ADLD8404’s small size (4 x 4 mm) allows telecommunications operators to increase the port density of their DSLAM (digital subscriber line access multiplexer) line cards.

The device consists of two differential, high-output current, low-power operational amplifiers. The driver incorporates AD’s patented Adaptive Linear Power technology, a technique that tracks ADSL2+/VDSL2 input signals on two channels simultaneously, and then dynamically selects the higher peak. By ensuring the tracking supply is always at the highest level, the new line driver eliminates clipped signals and distortion even when operating at the VDSL2 transmission frequencies of up to 17,6 MHz. The ADLD8404 integrates two charge pumps on-chip, allowing line card designers to cost-effectively support higher channel densities in multi-port DSLAM access concentrators that distribute broadband signals to hotels and large, multitenant commercial and residential buildings.

The line driver’s two differential DSL channels include current feedback and high-output current amplifiers with integrated resistors and biasing network. It operates from a single 14 V supply and features 20,4 dBm line power, 40 V p-p differential output voltage and low distortion: -65 dBc MTPR (multitone power ratio) at 20,4 dBm, operating 26 kHz to 2,2 MHz; and -55 dBc MTPR at 14,5 dBm, operating 5,2 MHz to 17,6 MHz.

For more information contact Stella Homan, Avnet Kopp, +27 (0)11 809 6100, [email protected], www.avnet.co.za

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