THS6226_15 Datasheet, PDF (10/21 Pages) Texas Instruments – Gated-Class H, Dual-Port VDSL2 Line Driver

THS6226
SBOS499C – JANUARY 2011 – REVISED APRIL 2011
APPLICATION INFORMATION
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The THS6226 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 THS6226 is capable of driving a 60Ω load from +1.9V to
+10.1V. In class H mode, under the same conditions, the output voltage range becomes an impressive –5.5V to
+17.5V, or 46V_PP differentially with the capacitor fully charged.
Figure 20 shows a fully-differential, noninverting amplifier configuration with active impedance. In this
configuration, the 10.2Ω matching resistance appears through the transformer as 100Ω, minimizing reflection on
the line, while also minimizing transmission losses. The THS6226 gain is fixed and equal to 19V/V from input of
the amplifier to the output of the amplifier (IN_CD to OUT_CD), not including the transformer-turn ratio.
To simplify the implementation as well as provide design flexibility, the THS6226 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.
1mF
VLL_CD
CAPL_CD
IND
V_IN+
+12V
FBC
OUTD
THS6226
+12V
100kW
1:1.4
10.2W
33nF
Line:
100W
V_IN-
INC
OUTC
FBD
DATA
CLK
VHH_CD
CAPH_CD
1mF
Figure 20. Multi-Tone Power Ratio (MTPR) Test Circuit
10
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