VCA8500_0803 Datasheet, PDF (13/40 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
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.
55
50
45
40
35
30
25
20
15
10
5
0
-5
-10
0
GAIN vs V_CNTRL (at PGA = X)
27dB
30dB
25dB
20dB
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
V_CNTRL (V)
Figure 2.
55
50
45
40
35
30
25
20
15
10
5
0
-5
-10
0.0
GAIN vs V_CNTRL OVER TEMPERATURE
30dB at -40°C
30dB at +25°C
30dB at +85°C
20dB at -40°C
20dB at +25°C
20dB at +85°C
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
V_CNTRL (V)
Figure 4.
GAIN vs V_CNTRL OVER FREQUENCY
55
50 ^{PGA = 20dB and 30dB}
45
40
35
30
25
20
15
10
5
0
-5
-10
0
30dB at 2MHz
30dB at 5MHz
30dB at 10MHz
20dB at 2MHz
20dB at 5MHz
20dB at 10MHz
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
V_CNTRL (V)
Figure 6.
GAIN ERROR vs V_CNTRL
0.50
0.25
PGA = 30dB
0
-0.25
PGA = 25dB
PGA = 27dB
PGA = 20dB
-0.50
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
V_CNTRL (V)
Figure 3.
1.50
1.25
1.00
0.75
0.50
0.25
0
-0.25
-0.50
-0.75
-1.00
-1.25
-1.50
0
GAIN ERROR DRIFT vs V_CNTRL
20dB at +85°C
30dB at +85°C
30dB at -40°C
20dB at -40°C
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
V_CNTRL (V)
Figure 5.
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0
GAIN MATCHING vs V_CNTRL
PGA = 30dB
PGA = 20dB
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
V_CNTRL (V)
Figure 7.
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