THS6226_15 Datasheet, PDF (12/21 Pages) Texas Instruments – Gated-Class H, Dual-Port VDSL2 Line Driver

THS6226
SBOS499C – JANUARY 2011 – REVISED APRIL 2011
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QUIESCENT CURRENT
The quiescent current of the THS6226 is dissipated in two main modules of the THS6226: the class AB and the
charge pump. B4 and B5 select the mode of operation, class AB operating with or without the charge pump
enabled, powering down the entire port, or operating in a line termination mode. Table 4 lists the details on each
bit functionality and the approximate quiescent current.
The class AB quiescent current is set by bits B6 to B9, using B4 and B5 for the power-down function, and B2 and
B3 for channel select. The approximate quiescent current for the amplifier core is shown in Table 3.
B6 (D3)
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
B7 (D2)
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Table 3. Class AB Quiescent Current
B8 (D1)
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
B9 (D0)
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
QUIESCENT CURRENT SETTING
ADSL2+ mode
Profile 8b mode
Profile 17a mode
Profile 30a mode
APPROXIMATE
I_Q (mA/Port)
7.6
8.7
9.8
10.9
12
13
14
15
16
17
18
19
20
21
22
23
The various power modes are shown in Table 4. For all modes, when B6 through B9 are not defined, set B9 =
B8 = B7 = B6 = 0 to achieve the lowest power dissipation possible.
B4 (PD1)
0
0
1
1
B5 (PD0)
0
1
0
1
Table 4. Power Modes
POWER-DOWN MODE
Power-down (B9, B8, B7, B6 = 0)
Line termination mode (B9, B8, B7, B6 = 0)
Class AB driver I_Q set by B6 to B9, class H disabled
Class AB driver I_Q set by B6 to B9, class H enabled
APPROXIMATE I_Q
(mA/Port)
0.85
4.4
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