VCA8500_0803 Datasheet, PDF (19/40 Pages) Texas Instruments – 8-Channel, Ultralow-Power, Variable Gain Amplifier with Low-Noise Pre-Amp

VCA8500
www.ti.com
SBOS390A – JANUARY 2008 – REVISED MARCH 2008
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.
3RD HARMONIC vs V_CNTRL OVER FREQUENCY
-45
PGA = 20dB
-50
V_OUT = 1V_PP
-55
2MHz
-60
10MHz
-65
-70
5MHz
-75
0.6
0.7
0.8
0.9
1.0
1.1
1.2
V_CNTRL (V)
Figure 38.
3RD HARMONIC vs V_CNTRL OVER FREQUENCY
-45
PGA = 27dB
-50
V_OUT = 1V_PP
-55
2MHz
-60
10MHz
-65
-70
5MHz
-75
0.6
0.7
0.8
0.9
1.0
1.1
1.2
V_CNTRL (V)
Figure 40.
DISTORTION vs R_LOAD
(Clamp Disabled)
-45
V_OUT = 1V_PP
-50
V_CNTRL = 1V
PGA = 20dB and 30dB
-55
2nd Harmonic, 30dB
2nd Harmonic, 20dB
-60
3rd Harmonic, 30dB
-65
-70
3rd Harmonic, 20dB
-75
750
1000
1250
Output Resistor Load (W)
Figure 42.
1500
3RD HARMONIC vs V_CNTRL OVER FREQUENCY
-45
PGA = 25dB
-50
V_OUT = 1V_PP
-55
2MHz
-60
10MHz
-65
-70
5MHz
-75
0.6
0.7
0.8
0.9
1.0
1.1
1.2
V_CNTRL (V)
Figure 39.
3RD HARMONIC vs V_CNTRL OVER FREQUENCY
-45
PGA = 30dB
-50
V_OUT = 1V_PP
10MHz
-55
2MHz
-60
-65
-70
-75
0.6
-45
-50
5MHz
0.7
0.8
0.9
1.0
1.1
1.2
V_CNTRL (V)
Figure 41.
DISTORTION vs R_LOAD
(Clamp Enabled)
3rd Harmonic, 30dB
-55
2nd Harmonic, 20dB
-60
-65
-70
-75
750
2nd Harmonic, 30dB
3rd Harmonic, 20dB
V_OUT = 1V_PP
V_CNTRL = 1V
PGA = 20dB and 30dB
1000
1250
Output Resistor Load (W)
Figure 43.
1500
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