Telecoms, Datacoms, Wireless, IoT


Differential line drivers for xDSL systems

1 June 2005 Telecoms, Datacoms, Wireless, IoT

The THS6184 is a dual-port, low-power current feedback differential line driver amplifier system from Texas Instruments for xDSL systems. It has very low-power dissipation making it well-suited for ADSL, ADSL2, ADSL2+, and ADSL2++ systems that must achieve high densities in ADSL central office rack applications by combining two ports, or four amplifiers, into one package.

The unique architecture of the device allows the trimmed quiescent current to be much lower than existing line drivers while still achieving high linearity. Distortion at these low-power levels is good with -73 dBc THD at 1 MHz with the low bias mode of 4,3 mA/port. Fixed and variable multiple-bias settings of the amplifiers allows for enhanced power savings for line lengths where the full performance of the amplifier is not required.

The wide output swing of 44 V pp differentially with ±12 V power supplies coupled with over 410 mA current drive allow for wide dynamic headroom, keeping distortion minimised. The THS6184 output stage incorporates extra catch-diodes to the power supply to minimise the external protection required in CO systems. With a low 2,9 nV/rt.Hz voltage noise coupled with a low 5,7 pA/rt.Hz inverting current noise, the THS6184 increases the sensitivity of the receive signals allowing for better margins and reach.

For more information contact Les Bidgood, Arrow Altech Distribution, +27 (0)11 923 9600, [email protected]



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