LMH6401_16 Datasheet, PDF (24/48 Pages) Texas Instruments – LMH6401 DC to 4.5 GHz, Fully-Differential, Digital Variable-Gain Amplifier

LMH6401
SBOS730A – APRIL 2015 – REVISED MAY 2015
9.6.3 Gain Control (address = 2h) [default = 20h]
Figure 55. Gain Control
7
6
5
Reserved
Power Down
R/W-0b
R/W-0b
R/W-1b
LEGEND: R/W = Read/Write; -n = value after reset
4
R/W-0b
3
2
Gain Control
R/W-0b
R/W-0b
1
R/W-0b
Table 6. Gain Control Field Description
Bit Field
7
Reserved
6
Power Down
5-0 Gain Control
Type
R/W
R/W
R/W
Default
0
0
100000
Description
Reserved, always program to 0
0 = Active
1 = Power down
Gain control (see Table 10 for gain settings)
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0
R/W-0b
9.6.4 Reserved (address = 3h) [default = 8Ch]
Figure 56. Reserved
7
6
5
R/W-1b
R/W-0b
R/W-0b
LEGEND: R/W = Read/Write; -n = value after reset
4
3
Reserved
R/W-0b
R/W-1b
2
R/W-1b
1
R/W-0b
0
R/W-0b
Bit Field
7-0 Reserved
Table 7. Reserved Field Descriptions
Type
R/W
Default Description
10001100 Reserved
9.6.5 Thermal Feedback Gain Control (address = 4h) [default = 27h]
Figure 57. Thermal Feedback Gain Control
7
6
5
Reserved
Reserved
Thermal SD
R/W-0b
R/W-0b
R/W-1b
LEGEND: R/W = Read/Write; -n = value after reset
4
R/W-0b
3
2
1
Thermal Feedback Gain Control
R/W-0b
R/W-1b
R/W-1b
0
R/W-1b
Table 8. Thermal Feedback Gain Control Field Descriptions
Bit Field
7-6 Reserved
5
Thermal SD
4-0 Thermal Feedback Gain Control
Type
R/W
R/W
R/W
Default
00
1
00111
Description
Reserved, always program to 00
0 = Thermal feedback control enabled
1 = Thermal feedback control disabled
00000 = Minimum thermal feedback gain (see Figure 61)
11111 = Maximum thermal feedback gain (see Figure 61)
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