VCA8500_0803 Datasheet, PDF (20/40 Pages) Texas Instruments – 8-Channel, Ultralow-Power, Variable Gain Amplifier with Low-Noise Pre-Amp

VCA8500
SBOS390A – JANUARY 2008 – REVISED MARCH 2008
www.ti.com
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.
DISTORTION vs FREQUENCY
-45
3rd Harmonic, 30dB
-50
3rd Harmonic, 20dB
-55
-60
-65
-70
-75
1
2nd Harmonic, 20dB
2nd Harmonic, 30dB
PGA = 20dB and 30dB
V_OUT = 2V_PP
V_CNTRL = 1V
10
Frequency (MHz)
Figure 44.
DISTORTION vs V_OUT, PEAK-TO-PEAK
-45
PGA = 30dB
-50
V_CNTRL = 1.2V
Frequency = 5MHz
-55
2nd Harmonic
-60
-65
3rd Harmonic
-70
-75
1.0
1.2
1.4
1.6
1.8
2.0
V_OUT (V_PP)
Figure 46.
CROSSTALK vs V_CNTRL
-50 _{Adjacent Channels}
PGA = 20dB
-55 _{VOUT = 1VPP}
-60
10MHz
-65
5MHz
-70
2MHz
-75
-80
0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
V_CNTRL (V)
Figure 48.
DISTORTION vs PGA GAIN
-45
3rd Harmonic, 1.0V_CNTRL
3rd Harmonic, 1.2V_CNTRL
-50
-55
2nd Harmonic, 1.0V_CNTRL
-60
2nd Harmonic, 1.2V_CNTRL
-65
-70 _{Frequency = 5MHz}
V_OUT = 2V_PP
-75
20
25
27
30
PGA Gain (dB)
Figure 45.
INTERMODULATION DISTORTION
(4.99MHz and 5.01MHz)
10
V_OUT = 1V_PP
4.5
0 _{PGA = 30dB}
-10 ^VCNTRL ^{= 1V}
-20
-21.3
-30
-40
-50
-60
-70
-73.5
-80
-90
4.90 4.92 4.94 4.96 4.98 5.00 5.02 5.04 5.06 5.08 5.10
Frequency (MHz)
Figure 47.
CROSSTALK vs V_CNTRL
-50 _{Adjacent Channels}
PGA = 25dB
-55 _{VOUT = 1VPP}
-60
10MHz
-65
5MHz
-70
2MHz
-75
-80
0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
V_CNTRL (V)
Figure 49.
20
Submit Documentation Feedback
Product Folder Link(s): VCA8500
Copyright © 2008, Texas Instruments Incorporated