LMH6518_15 Datasheet, PDF (29/41 Pages) Texas Instruments – LMH6518 900 MHz, Digitally Controlled, Variable Gain Amplifier

LMH6518
www.ti.com
SNOSB21C – MAY 2008 – REVISED JULY 2013
Table 4. Data Field
D15 D14 D13 D12 D11
D10
(MSB)
X
0
0
0
0 0=Full Power
1=Aux Hi-Z
Filter
Pre-amp
Ladder Attenuation
D9 D8 D7 D6 D5
D4
D3 D2 D1 D0
(LSB)
0
See Table 6
0
0=LG
1=HG
See Table 7
NOTE
Bits D5, D9, D11-D14 must be “0”. Otherwise, device operation is undefined and
specifications are not ensured.
Table 5. Default Power-On Reset Condition
D15 D14 D13 D12 D11 D10 D9
(MSB)
0
0
0
0
0
0
0
Filter
D8 D7 D6
0
0
0
Pre-amp
Ladder Attenuation
D5
D4
D3 D2 D1
D0
(LSB)
0
0
10
1
0
Table 6. Filer Selection Data Field
Filter
D8
D7
D6
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Filter BW
(MHz)
Full
20
100
200
350
650
750
Unallowed
NOTE
All filters are low pass single pole roll-off and operate on both Main and Auxiliary outputs.
These filters are intended as signal path bandwidth and/ or noise limiting.
Table 7. Ladder Attenuation Data Field
Ladder Attenuation
Ladder Attenuation (dB)
D3
D2
D1
D0
0
0
0
0
0
0
0
0
1
−2
0
0
1
0
−4
0
0
1
1
−6
0
1
0
0
−8
0
1
0
1
−10
0
1
1
0
−12
0
1
1
1
−14
1
0
0
0
−16
1
0
0
1
−18
1
0
1
0
−20
1
0
1
1
Unallowed
1
1
0
0
Unallowed
1
1
0
1
Unallowed
1
1
1
0
Unallowed
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