THS6226A_16 Datasheet, PDF (17/32 Pages) Texas Instruments – THS6226A Gated-Class H, Dual-Port VDSL2 Line Driver

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THS6226A
SBOS643A – APRIL 2014 – REVISED MAY 2014
7.5.2 Quiescent Current
The device quiescent current is dissipated in two main device modules: the class AB and the charge pump. Bits
B4 (PD1) and B5 (PD0) select one of the possible four modes of operation:
1. Class AB mode (charge pump disabled),
2. Class H mode (charge pump enabled),
3. Disable mode, or
4. Line termination mode (maintains line matching, core amplifier at very low bias mode and charge pump
disabled for lowest power consumption possible).
Table 3 lists the details on each bit functionality and the approximate quiescent current. The various power
modes are shown in Table 3. For all modes, when B6 through B9 are not defined, set B9 = B8 = B7 = B6 = 0 to
achieve the lowest power dissipation possible.
Table 3. Power Modes
B4 (PD1)
0
0
1
1
B5 (PD0)
0
1
0
1
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 per Port)
0.85
4.4
—
—
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 selection. The approximate quiescent current for the amplifier core is shown in Table 4.
BIAS
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
B6 (D3)
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Table 4. Class AB Quiescent Current
B7 (D2)
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
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
APPROXIMATE
I_Q (mA per Port)
9.4
10.4
11.5
12.5
13.6
14.6
15.7
16.7
17.8
18.8
19.8
20.8
21.8
22.8
23.8
24.8
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