LMH6518_15 Datasheet, PDF (13/41 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⁾.
HD3
vs.
Ladder Attenuation
-75
HG
10 MHz
-70
20 MHz
Main and Auxiliary Distortion Comparison
-85
HG, 65 MHz
-80
Aux
HD2
-75
-65
250 MHz
-70
Main
100 MHz
-60
500 MHz
-55
50 MHz
-65
HD3
Aux
-60
-55
-50
0
4
8
12
16
20
LADDER ATTENUATION (dB)
Figure 26.
-50
0
4
8
12
16
20
LADDER ATTENUATION (dB)
Figure 27.
Main and Auxiliary Distortion Comparison
-95
LG, 65 MHz
-90
-85
HD3
-80
Aux
Main
-75
-70
-65
-60
-55
-50
0
HD2
Aux
4
8
12
16
20
LADDER ATTENUATION (dB)
Figure 28.
-85
-83
-81
-79
-77
-75
-73
-71
-69
-67
-65
-7
Distortion
vs.
Output Power
HG, 10 dB
65 MHz
HD2
HD3
-6 -5 -4 -3 -2 -1 0
OUTPUT POWER (dB_FS)
Figure 29.
Gain
vs.
Ladder Attenuation
42
38 ^HG
-40°C to 85°C
34
30
26
22
LG
18
14
10
6
2
-2
0
4
8
12
16
20
LADDER ATTENUATION (dB)
Figure 30.
0.25
0.2
0.15
0.1
0.05
0
-0.05
-0.1
-0.15
0
Gain Accuracy
vs.
Ladder Attenuation
LG
-40°C
25°C
85°C
-40°C
25°C
85°C
HG
Relative to HG/0 dB @ 25°C
4
8
12
16
20
LADDER ATTENUATION (dB)
Figure 31.
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