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TI VDSL Class H Line Driver Claims 47% Power Savings
Wednesday, 16 March 2011 21:16
TI illustration
I've been hearing for a long time about the potential of Class H amplifiers to reduce power, so I'm reproducing below TI's announcement. I have not researched this and am not pretending this is an article from me rather than pr. However, since the product is already shipping and potentially important, I wanted to report it. In remote terminals such as AT&T U-Verse, power is a serious system limit. If this works as TI claims, it's an important advance. Readers - help me here with perspective, presumably off the record.
FEATURES DESCRIPTION
23• Digitally-Adjustable Quiescent Current: The THS6226 is a dual-port, class H,
7.6mA to 23.0mA current-feedback architecture, differential line driver
• 1.0mA Bias Current Step amplifier system ideal for xDSL systems. The device
• Independent Voltage Boost and Main Line is targeted for use in very-high-bit-rate digital subscriber line 2 (VDSL2) line driver systems that Driver Disable enable native DTM signals while supporting greater
• Low-Power Line Termination Mode than +20.5dBm line power (up to 8.5MHz) with good
• Full Capacitor Recharge: 3ms linearity, supporting the G.993.2 VDSL2 8b profile. It
• Low Input Voltage Noise Density: is also fast enough to support central-office transmission of +14.5dBm line power up to 30MHz. 6.3 nV/√Hz Input-Referred Voltage Noise
• Low MTPR Distortion: The unique architecture of the THS6226 allows
70dB with +19.8dBm G.993.2—Profile 8b quiescent current to be minimal while still achieving very high linearity. Differential distortion, under full
• –91dBc HD3 (1MHz, 60Ω Differential) bias conditions, is –91dBc at 1MHz and reduces to
• High Output Current: (383mA into 60Ω) only –75dBc at 5MHz. Fixed multiple bias settings of
• Wide Output Swing: 40V the amplifiers offer enhanced power savings for line PP (+12V, 60Ω Differential Load with a 1:1.4 Transformer) lengths where the full performance of the amplifier is not required. To allow for even more flexibility and
• Wide Bandwidth: 125MHz power savings on all profiles, quiescent current is
• Port-to-Port Separation of 90dB at 1MHz digitally adjustable from 7.6mA to 23mA with a bias
• PSRR: 70dB at 1MHz for Good Isolation current step of 1.0mA. For systems where additional power savings while not transmitting are desired, the APPLICATIONS THS6226 can be used in its line termination mode to maintain impedance matching.
• Ideal for All VDSL2 Profiles
• Backwards-Compatible with The wide output swing on +12V power supplies,
ADSL/ADSL2+/ADSL2++ Systems coupled with excellent current drive, allows for wide dynamic headroom, keeping distortion minimal.
The THS6226

TI delivers industry's first Class H VDSL line driver for high-speed networking equipment

Single device provides lowest power consumption across all VDSL profiles

DALLAS, March 15, 2011 /PRNewswire/ -- Texas Instruments Incorporated (TI) (NYSE: TXN) today introduced the industry's first Class H VDSL line driver in full production. Compared to Class AB alternatives, the gated, dual-port THS6226 consumes 47 percent less power, a critical requirement for the high-density VDSL applications used in high-speed broadband networks.

  

And by offering a digitally adjustable quiescent current, the THS6226 line driver allows for optimum power savings while still achieving high linearity and low distortion. The THS6226 also simplifies product sourcing and design by covering all VDSL profiles with a single line driver. For more information and to order samples of the THS6226, visit: www.ti.com/ths6226-pr.

"The best-in-class power consumption of TI's THS6226 VDSL line driver allows Lantiq to deliver a complete VDSL reference system with the enhanced power performance our customers require," said Johannes Eiblmeier, head of marketing of Lantiq's Access Networks Business Unit. "When used together, our newest generation VINAX™ V3 VDSL chipset and TI's THS6226 set a new benchmark for system power consumption and integration while providing flexibility to use one line card for all VDSL profiles."

Key features and benefits

  • Single Class H solution provides lowest power consumption for all VDSL profiles, as low as 350 mW for 17a profile.
  • Adjustable quiescent current of 7.6 mA to 23.5 mA with a current step of 1 mA provides designers flexibility to fine-tune the power control.
  • Offers low multi-tone power ratio (MTPR) distortion of 70 dB with 19.8 dBm for VDSL2 profile 8b to help maintain signal fidelity.
  • Integrates an input biasing circuit and all gain and feedback resistors to reduce system board space and cost.
  • Wide output swing on +12-V power supplies, coupled with excellent current drive, allows for up to 20-dBm output power into the load.

Tools and support

TI offers a variety of free tools and support to speed development with the THS6226, including:

Availability and pricing

The THS6226 VDSL line driver is available now in a 5-mm x 5-mm QFN package, priced at $1.50 in quantities of 1,000.
Last Updated on Thursday, 17 March 2011 13:08