VCA8500_0803 Datasheet, PDF (21/40 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.
CROSSTALK vs V_CNTRL
-50
Adjacent Channels
PGA = 27dB
-55 _{VOUT = 1VPP}
-60
10MHz
-65
5MHz
-70
2MHz
-75
-80
0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
V_CNTRL (V)
Figure 50.
LNA OVERLOAD
(V_IN = 300mV_PP)
CROSSTALK vs V_CNTRL
-50
Adjacent Channels
PGA = 30dB
-55 _{VOUT = 1VPP}
-60
10MHz
-65
5MHz
-70
2MHz
-75
-80
0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
V_CNTRL (V)
Figure 51.
LNA OVERLOAD
(V_IN = 400mV_PP)
Input
CH 1
(100mV/div)
Output
CH 2
(500mV/div)
PGA = 20dB
V_OUT = 2V_PP
V_CNTRL = 0.54V
Input
CH 1
(200mV/div)
Output
CH 2
(1V/div)
PGA = 20dB
V_OUT = 2V_PP
V_CNTRL = 0.54V
Input
CH 1
(20mV/div)
Output
CH 2
(0.5V/div)
Time (200ns/div)
Figure 52.
PGA OVERLOAD
(V_IN = 34mV_PP)
PGA = 20dB
V_OUT = 2.5V_PP
V_CNTRL = 1V
Input
CH 1
(50mV/div)
Output
CH 2
(0.5V/div)
Time (200ns/div)
Figure 53.
PGA OVERLOAD
(V_IN = 50mV_PP)
PGA = 20dB
V_OUT = 2.8V_PP
V_CNTRL = 1V
Time (200ns/div)
Figure 54.
Time (200ns/div)
Figure 55.
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