LMH6401_16 Datasheet, PDF (14/48 Pages) Texas Instruments – LMH6401 DC to 4.5 GHz, Fully-Differential, Digital Variable-Gain Amplifier

LMH6401
SBOS730A – APRIL 2015 – REVISED MAY 2015
www.ti.com
Typical Characteristics (continued)
At T_A = 25°C, VS– = –2.5 V, VS+ = 2.5 V, VOCM = 0 V, R_LOAD = 200-Ω differential (R_{o(internal, diff)} = 20 Ω), V_O = 2 V_PPD, and A_V
= 26 dB, unless otherwise noted. Differential input and output, and input and output pins referenced to mid-supply, unless
otherwise noted. Measured using an EVM as discussed in the Parameter Measurement Information section.
0.4
16
250
R
0.3
12
jX
200
|Z|
0.2
8
150
0.1
4
0
0
100
-0.1
-4
-0.2
-8
-0.3
Gain error -12
Phase error
-0.4
-16
-6 -4 -2 0 2 4 6 8 10 12 14 16 18 20 22 24 26
Voltage Gain (dB)
D043
f = 500 MHz
50
0
-50
10
100
1000
Frequency (MHz)
5000
D016
Figure 31. Cumulative Gain and Phase Step Error vs
Gain Settings
120
R
100
jX
|Z|
80
60
40
20
0
-20
Figure 32. Input Impedance vs Frequency
90
4.0 V
85
5.0 V
5.25 V
80
75
70
65
60
-40
10
100
1000
Frequency (MHz)
5000
D017
55
-45 -25
-5
15
35
55
Temperature (°C)
75 90
D041
Figure 33. Output Impedance vs Frequency
0.3
3
Vin
2VppOut
0.2
4VppOut ²
0.1
1
0
0
-0.1
-1
-0.2
-2
-0.3
-3
Time (1 nsec/div)
D037
Figure 34. Supply Current vs Temperature
2.5
2.4
Output
2
PowerDown Pin ₂
1.5
1.6
1
1.2
0.5
0.8
0
0.4
-0.5
0
-1
-0.4
Time (20 nsec/div)
D028
Figure 35. Output Step Response
Figure 36. Power-Down Transition Response
14
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