LMH6518_15 Datasheet, PDF (11/41 Pages) Texas Instruments – LMH6518 900 MHz, Digitally Controlled, Variable Gain Amplifier

LMH6518
www.ti.com
SNOSB21C – MAY 2008 – REVISED JULY 2013
Typical Performance Characteristics (continued)
Unless otherwise specified, Input CM = 2.5V, V_CM = 1.2V, V_{CM AUX} = 1.2V, Single-ended input drive, V_CC = 5V, V_DD = 3.3V, R_L
= 100Ω differential (both Main & Auxiliary Outputs), V_OUT = 0.7 V_PP differential (both Main and Auxiliary Outputs), Main output
specification (Auxiliary is labeled “Auxiliary”), full bandwidth setting, gain = 18.8 dB (Preamp LG, 0 dB ladder attenuation), Full
Power setting ⁽¹⁾.
Response
vs.
Gain
1
HG, 0 dB
0
Phase
vs.
Gain
0
650 MHz Filter
-50
HG, 20 dB
-1
-2
LG, 0 dB
-100
LG, 20 dB
-3
-150
-200
-4
LG, 0 dB
-5
650 MHz Filter
-6
10
100
1G
-250
-300
0
HG, 20 dB
LG, 20 dB
HG, 0 dB
200 400 600 800 1000
FREQUENCY (MHz)
FREQUENCY (MHz)
Figure 14.
Figure 15.
Balance Error
-10
1
Phase
-20
0
-30
-1
-40
-2
LG, 0 dB
-50
-3
-60
-4
-70 _Gain
-5
-80
-6
-90
1
-7
10
100
1G
FREQUENCY (MHz)
Figure 16.
Linear Phase Deviation and Group Delay
15
18
10
15
5
12
Linear Phase Deviation
0
9
-5
6
-10
-15
1
Group Delay
10
100
FREQUENCY (MHz)
Figure 17.
3
0
1000
Noise
vs.
Ladder Attenuation
2.5
100
f = 10 MHz
2.3
Preamp HG
2.1
80
1.9
1.7
60
1.5
1.3
40
1.1
0.9
20
Input Referred
0.7
Output Referred
0.5
0
0 2 4 6 8 10 12 14 16 18 20
LADDER ATTENUATION (dB)
Figure 18.
Noise
vs.
Ladder Attenuation
18
45
f = 10 MHz
16
Preamp LG
40
14
35
12
30
10
25
8
20
6
15
4
10
Input Referred
2
5
Output Referred
0
0
0 2 4 6 8 10 12 14 16 18 20
LADDER ATTENUATION (dB)
Figure 19.
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