VCA8500_0803 Datasheet, PDF (18/40 Pages) Texas Instruments – 8-Channel, Ultralow-Power, Variable Gain Amplifier with Low-Noise Pre-Amp

VCA8500
SBOS390A – JANUARY 2008 – REVISED MARCH 2008
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TYPICAL CHARACTERISTICS (continued)
All specifications at T_A = +25°C, AVDD2 = 5.0V, AVDD1 = DVDD = 3.3V; single-ended, ac-coupled (1µF) input configuration
to the preamp (LNA), f_IN = 5MHz, V_CNTL = 1.0V, clamp disabled (CL = 1), LPF = 15MHz, and R_LOAD = 1kΩ on each output to
ground, unless otherwise noted.
2ND HARMONIC vs V_CNTRL OVER PGA GAIN
-45
25dB ^20dB
Frequency = 5MHz
-50
V_OUT = 1V_PP
-55
30dB
27dB
-60
-65
-70
-75
0.6
0.7
0.8
0.9
1.0
1.1
1.2
V_CNTRL (V)
Figure 32.
2ND HARMONIC vs V_CNTRL OVER FREQUENCY
-45
10MHz
PGA = 20dB
-50
V_OUT = 1V_PP
-55
-60
2MHz
5MHz
-65
-70
-75
0.6
0.7
0.8
0.9
1.0
1.1
1.2
V_CNTRL (V)
Figure 34.
2ND HARMONIC vs V_CNTRL OVER FREQUENCY
-45
PGA = 27dB
-50
10MHz
V_OUT = 1V_PP
-55
-60
2MHz
-65
-70
5MHz
-75
0.6
0.7
0.8
0.9
1.0
1.1
1.2
V_CNTRL (V)
Figure 36.
3RD HARMONIC vs V_CNTRL OVER PGA GAIN
-45
Frequency = 5MHz
-50
V_OUT = 1V_PP
-55
-60
30dB 27dB
-65
-70
20dB ^25dB
-75
0.6
0.7
0.8
0.9
1.0
1.1
1.2
V_CNTRL (V)
Figure 33.
2ND HARMONIC vs V_CNTRL OVER FREQUENCY
-45
-50
10MHz
PGA = 25dB
V_OUT = 1V_PP
-55
5MHz
-60
2MHz
-65
-70
-75
0.6
0.7
0.8
0.9
1.0
1.1
1.2
V_CNTRL (V)
Figure 35.
2ND HARMONIC vs V_CNTRL OVER FREQUENCY
-45
PGA = 30dB
-50
10MHz
V_OUT = 1V_PP
-55
-60
5MHz
-65
2MHz
-70
-75
0.6
0.7
0.8
0.9
1.0
1.1
1.2
V_CNTRL (V)
Figure 37.
18
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