VCA2615 Datasheet, PDF (7/29 Pages) Texas Instruments – Dual, Low-Noise Variable-Gain Amplifier with Preamp

VCA2615
www.ti.com
SBOS316C − JULY 2005 − REVISED SEPTEMBER 2005
TYPICAL CHARACTERISTICS (continued)
All specifications at TA = +25°C, VDD = 5V, load resistance = 500Ω on each output to ground; the input to the preamp (LNP) is single-ended;
fIN = 5MHz, LNP Gain (G1, G2) = 10, H/L = 0, V_CNTL = 2.5V; VCA output is 1VPP differential; CA, CB = 3.9µF, unless otherwise noted.
GAIN MATCHING, CHA to CHB
V_CNTL = 0.4V
60
50
40
30
20
10
0
GAIN MATCHING, CHA to CHB
V_CNTL = 2.0V
60
50
40
30
20
10
0
Delta Gain (dB)
Figure 7
Delta Gain (dB)
Figure 8
GAIN vs FREQUENCY
(V_CNTL = 0.7V, Lo VGA Gain)
25
GAIN vs FREQUENCY
(V_CNTL = 0.7V, Hi VGA Gain)
30
20
LNP = 11
15
LNP = 10
25
LNP = 11
20
LNP = 10
10
LNP = 01
5
15
LNP = 01
10
0
−5
0.1
LNP = 00
1
10
Frequency (MHz)
Figure 9
5
0
100
0.1
LNP= 00
1
10
100
Frequency (MHz)
Figure 10
GAIN vs FREQUENCY
GAIN vs FREQUENCY
(V_CNTL = 2.5V, Lo VGA Gain)
60
55
LNP = 11
50 _{LNP = 10}
45
LNP = 01
40
(V_CNTL = 2.5V, Hi VGA Gain)
70
65 ^{LNP = 11}
60
55
50
LNP = 10
45 ^{LNP = 01}
35 _{LNP = 00}
30
40
35 ^{LNP = 00}
25
30
20
25
20
15
15
10
10
5
5
0
0
0.1
1
10
100
0.1
1
10
100
Frequency (MHz)
Frequency (MHz)
Figure 11
Figure 12
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