Date: 17/09/2010

Dual port Class H VDSL line driver amplifier from Analog Devices

Analog Devices (ADI) has unveiled the ADLD8404, a dual-port DSL line driver Class H amplifier, which ADI claims reduces power consumption and system cost for designers of high-speed ADSL2+/VDSL2 line cards. ADI says that ADLD8404 is the industry's first Class H VDSL line driver and reduces power use by more than 20% as compared to competing Class AB amplifiers. The new driver also allows telecommunications operators to increase the port density of their DSLAM (digital subscriber line access multiplexer) line cards

The dual-port ADLD8404 consists of two differential, high-output current, low-power operational amplifiers. The driver incorporates ADI's Adaptive Linear Power technology (U.S. Patent No. 6636103). This technology tracks ADSL2+/VDSL2 input signals on two channels simultaneously, and then selects the higher peak. The 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 combines two charge pumps on-chip, allowing line card designers to support higher channel densities in multi-port DSLAM access concentrators that distribute broadband signals to hotels and large, multi-tenant commercial and residential buildings.

The key features of ADLD8404 Class H VDSL Line Driver includes:
--Two differential DSL channels include current feedback and high-output current amplifiers with integrated resistors and biasing network.
--20.4 dBm line power
--Single 14V supply
--40V p-p differential output voltage
--Low distortion
-65 dBc MTPR (multi-tone power ratio) at 20.4 dBm, operating 26 kHz to 2.2 MHz
-55 dBc MTPR at 14.5 dBm, operating 5.2 MHz to 17.6 MHz

Availability and Pricing:
Product Sample
Availability Temperature
Range Price Each
Per 1,000 Packaging
ADLD8404 Now -40°C to +85°C $1.42 24-lead LFCSP
4 mm x 4 mm