LMH6518_15 Datasheet, PDF (12/41 Pages) Texas Instruments – LMH6518 900 MHz, Digitally Controlled, Variable Gain Amplifier

LMH6518
SNOSB21C – MAY 2008 – REVISED JULY 2013
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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⁾.
Noise Figure
vs.
Gain
Input Voltage Noise
vs.
Frequency
28
26 ^{f = 10 MHz}
24 ^RS ^{= 50: on each input}
1000
22
100
20
18
16 ^{Preamp LG}
14
12
LG, 20 dB
10
LG, 0 dB
10
8
HG, 20 dB
1
6
HG, 0 dB
4
Preamp HG
2
0
0
5
10
15
20
0
1 10 100 1k 10k ^100k 1M
LADDER ATTENUATION (dB)
FREQUENCY (kHz)
Figure 20.
Figure 21.
Input Current Noise
vs.
Frequency
100
10
LG
HG
1
1 10 100 1k 10k 100k 1M
FREQUENCY (kHz)
Figure 22.
HD2
vs.
Ladder Attenuation
-75
-70
10 MHz
-65
20 MHz
-60
50 MHz
-55 _{100 MHz}
-50
-45 500 MHz
250 MHz
-40
-35
LG
-30
0
4
8
12
16
20
LADDER ATTENUATION (dB)
Figure 23.
HD3
vs.
Ladder Attenuation
-85
LG
-80
10 MHz
-75
20 MHz
-70
250 MHz
-65
-60 _{500 MHz}
-55
-50
0
50 MHz
100 MHz
4
8
12
16
20
LADDER ATTENUATION (dB)
Figure 24.
HD2
vs.
Ladder Attenuation
-70
20 MHz
10 MHz
-65
-60
250 MHz
-55
-50
100 MHz
50 MHz
-45
500 MHz
-40
-35
HG
-30
0
4
8
12
16
20
LADDER ATTENUATION (dB)
Figure 25.
12
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