Analog Devices’ Class H VDSL Line Driver Amplifier Incorporates Patented Signal Power Tracking Technology to Reduce Broadband Power Use

The dual-port ADLD8404 consists of two differential, high-output current, low-power operational amplifiers. The driver incorporates Analog Devices’ patented Adaptive Linear Power™ technology (U.S. Patent No. 6636103), 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 dual-port ADLD8404 Class H line driver 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, multi-tenant commercial and residential buildings.

ADLD8404 Class H VDSL Line Driver Key Features and Benefits:

· Two differential DSL channels include current feedback and high-output current amplifiers with integrated resistors and biasing network.

· 20.4 dBm line power

· Single 14-V supply

· 40-V p-p differential output voltage

· Low distortion

1. -65 dBc MTPR (multi-tone power ratio) at 20.4 dBm, operating 26 kHz to 2.2 MHz

2. -55 dBc MTPR at 14.5 dBm, operating 5.2 MHz to 17.6 MHz