VCA8500_0803 Datasheet, PDF (22/40 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.
Input
CH 1
(50mV/div)
Output
CH 2
(0.5V/div)
PGA OVERLOAD
(V_IN = 50mV_PP, Clamp Enabled)
PGA = 20dB
V_OUT = 1.7V_PP
V_CNTRL = 1V
Input
CH 1
(22.4mV/div)
Output
CH 2
(2.8V/div)
PGA OVERLOAD
(V_IN = 20mV_PP)
PGA = 30dB
V_OUT = 2.8V_PP
V_CNTRL = 1V
V_CNTRL
CH 1
(0.5V/div)
Time (200ns/div)
Figure 56.
V_CNTRL RESPONSE TIME
Output
CH 2
(0.5V/div)
PGA = 30dB
V_OUT = 1V_PP
Time (1ms/div)
Figure 58.
PD Pin
CH 1
(1V/div)
Output
CH 2
(0.2V/div)
Time (200ns/div)
Figure 57.
POWER-DOWN RESPONSE TIME
PGA = 20dB
V_OUT = 1V_PP
V_CNTRL = 0.6V
Time (1ms/div)
Figure 59.
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