THS6226A Datasheet, PDF (14/32 Pages) Texas Instruments – THS6226A Gated-Class H, Dual-Port VDSL2 Line Driver

THS6226A
SBOS643A – APRIL 2014 – REVISED MAY 2014
7 Detailed Description
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7.1 Overview
The THS6226A class H line driver provides exceptional ac performance in conjunction with wide output voltage
swing. The class H operation allows voltage swings to exceed the power supply for short intervals limited only by
the charge in the capacitor. In class AB mode, the device is capable of driving a 100-Ω load from +1.8 V to
+10.2 V. In class H mode, under the same conditions, the output voltage range becomes an impressive –5.5 V to
+17.5 V, or 46 V_PP differentially with the capacitor fully charged.
The Functional Block Diagram section shows a fully-differential, noninverting amplifier configuration with active
impedance. In this configuration, the 10.2-Ω matching resistor appears through the transformer as 100 Ω,
minimizing reflection on the line. This active impedance scheme also minimizes transmission losses, as
compared to passive termination. Device gain is fixed and is equal to 19 V/V from the input to the output of the
amplifier (IN_AB/CD to OUT_AB/CD), not including the transformer-turn ratio or the termination loss.
To simplify the implementation as well as to provide design flexibility, the device contains an integrated mid-
supply buffer that provides the correct biasing to the amplifier core without requiring any external components.
Also present is a two-pin serial interface that provides exceptional design flexibility and allows minimal power
consumption for each xDSL profile.
7.2 Functional Block Diagram
VLL_AB,
VLL_CD
CAPL_AB,
CAPL_CD
IN_B, IN_D
Class H Functions
FB_B, FB_D
OUTB, OUTD
Voltage
Reference
IN_A, IN_C
OUTA, OUTC
Bias
RESET DATA CLK
FB_A, FB_C
Class H Functions
VHH_AB,
VHH_CD
CAPH_AB,
CAPH_CD
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