THS6226A Datasheet, PDF (21/32 Pages) Texas Instruments – THS6226A Gated-Class H, Dual-Port VDSL2 Line Driver

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8.2.3 Application Curves
THS6226A
SBOS643A – APRIL 2014 – REVISED MAY 2014
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0.25 0.5 0.75 1 1.25 1.5
Frequency (MHz)
19.8-dBm Tx Power
1:1.4 Transformer into 100 Ω
Profile
Single Channel
Dual Channel
1.75
2 2.25
C008
Bias 2
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0
1
2
3
4
5
6
Frequency (MHz)
20.5-dBm Tx Power
1:1.4 Transformer into 100 Ω
Profile
Single Channel
Dual Channel
7
8
C010
Bias 7
Figure 35. ADSL MTPR
Figure 36. VDSL 8b MTPR
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Profile
Single Channel
Dual Channel
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0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Frequency (MHz)
14.5-dBm Tx Power
1:1.4 Transformer into 100 Ω
C012
Bias 11
Figure 37. VDSL 17a MTPR
8.3 Initialization Set Up
After the initial power-up and prior to sending any words to program the device, TI recommends sending a string
of twelve 1s (111111111111) to ensure that the state machine is initialized.
9 Power Supply Recommendations
As a result of large recharge current flowing in and out of the four charge pump capacitors during charge pump
discharge and recharge events, TI recommends placing bypass capacitors that are at least equal in value to the
charge pump capacitor close to each supply voltage pin. A minimum of 2-µF bypass capacitors for each channel
are required to minimize any transient appearing on the power supply because both positive and negative charge
pump 1-µF bypass capacitors are recharged on the +12-V supply.
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