LMH6518_15 Datasheet, PDF (14/41 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⁾.
Auxiliary Gain Accuracy
vs.
Ladder Attenuation
Gain Matching
vs.
Ladder Attenuation
0.25
LG
-40°C
0.2
25°C
-0.088
-0.089
Aux Gain ± Main Gain
0.15
0.1
0.05
0
-0.05
-0.1
-0.15
0
85°C
-40°C
25°C
85°C
HG
Relative to HG/0 dB @ 25°C
4
8
12
16
20
-0.09
-0.091
-0.092
-0.093
-0.094
0
LG
HG
4
8
12
16
20
LADDER ATTENUATION (dB)
Figure 32.
LADDER ATTENUATION (dB)
Figure 33.
A_{V_CM}
20
LG, 0 dB
10
LG, 20 dB
0
-10 ^{HG, 20 dB}
HG, 0 dB
-20
-30
-40
-40°C
-50
1.5
5
2.5
3
3.5
V_{I_CM}
Figure 34.
A_{V_CM}
20
LG, 0 dB
10
LG, 20 dB
0
HG, 20 dB
-10
-20
HG, 0 dB
-30
-40
25°C
-50
1.5
5
2.5
3
3.5
V_{I_CM}
Figure 35.
20
LG, 0 dB
A_{V_CM}
10
LG, 20 dB
0
-10
HG, 20 dB
-20
HG, 0 dB
-30
-40
85°C
-50
1.5
5
2.5
3
3.5
V_{I_CM}
Figure 36.
2.0 _LG
1.9
−1 dB Compression
vs.
Ladder Attenuation
1.8 HG
1.7 _{Aux, LG}
1.6
Aux, HG
1.5
1.4
1.3
1.2
1.1 ^{f = 250 MHz}
R_L = 100
1.0
0
4
8
12
16
20
LADDER ATTENUATION (dB)
Figure 37.
14
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