ADI ADSL line driver delivers 18V from 12V supply

Designed using Adaptive Linear Power (ALP) architecture, the AD8393 ADSL line driver from Analog Devices anticipates signal peaks in the network, and delivers 18V from a single 12V supply when the peak power is needed.

The device is designed for driving DMT signals onto a twisted pair line with a crest factor range of 3.3 to 6.4. It is also suitable for driving 1:1.2 and 1:2 transformers.

Line driver power consumption currently accounts for over 60 percent of the total power per port in ADSL CO applications, limiting the overall port density of CO systems and contributing significantly to the cost of system thermal management.

The company claims that the ALP architecture can increase CO power efficiency by more than 50 percent, enabling increased port density. The single-supply capability of the ALP amplifier architecture also enables system designers to eliminate as many as three analog supply voltages as compared to competing solutions, such as class G line drivers.

At full-rate ADSL, the line driver dissipates 575mW for non-overlapped applications (19.8dBm line power) and 624mW for overlapped applications (20.4dBm line power).

The AD8393 is available in 28-lead TSSOP or 32-lead, 5-by-5mm CSP housing.