VCA8500_0803 Datasheet, PDF (15/40 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.
TGC CURRENT vs TEMPERATURE
170
160
150
+3.3VA
140
130
120
110
100
90
80
70
60
50
40
30
+5V
+3.3VD
20
10
0
-40
-15
10
35
60
85
Temperature (°C)
Figure 14.
TOTAL POWER vs TEMPERATURE
560
550
540
CW Mode
530
520
TGC Mode
510
500
490
-40
-15
10
35
60
85
Temperature (°C)
Figure 16.
FREQUENCY RESPONSE vs V_CNTRL AT PGA = 30dB
(LPF = 15MHz and 10MHz)
50
45
40 _1.0VCNTRL
35
30
25 0.7V_CNTRL
20
15
10 ^0.4VCNTRL
5
0
-5 ^0.1VCNTRL
-10
-15
-20
0.1
15MHz
10MHz
1
10
100
Frequency (MHz)
Figure 18.
CW CURRENT vs TEMPERATURE
90
85
80
+3.3VA
75
70
65
60
+5V
55
50
45
40
35
30
25
20
15
10
5
+3.3VD
0
-40
-15
10
35
60
85
Temperature (°C)
Figure 15.
FREQUENCY RESPONSE vs V_CNTRL AT PGA = 20dB
(LPF = 15MHz and 10MHz)
50
45 1.0V_CNTRL
40
15MHz
10MHz
35
30
25
20
15 ^0.7VCNTRL
10
5
0 ^0.4VCNTRL
-5
-10
-15
0.1V_CNTRL
-20
-25
-30
0.1
1
10
100
Frequency (MHz)
Figure 17.
OUTPUT-REFERRED NOISE vs V_CNTRL
250
Frequency = 2MHz
200
150
PGA = 30dB
100
PGA = 20dB
50
0
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 19.
Copyright © 2008, Texas Instruments Incorporated
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