VCA2615 Datasheet, PDF (8/29 Pages) Texas Instruments – Dual, Low-Noise Variable-Gain Amplifier with Preamp

VCA2615
SBOS316C − JULY 2005 − REVISED SEPTEMBER 2005
www.ti.com
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.
25
20
15
10
5
0
−5
0.1
GAIN vs FREQUENCY
(LNP Only)
LNP = 11
LNP = 10
LNP = 01
LNP = 00
1
10
Frequency (MHz)
Figure 13
45
Hi Gain,
40 _{VCNTL 2.5V}
35
GAIN vs FREQUENCY
(VGA Only)
30
Lo Gain,
25
V_CNTL 2.5V
20
Hi Gain,
15
V_CNTL 0.7V
10
Lo Gain,
5
V_CNTL 0.7V
0
−5
−10
100
0.1
1
10
100
Frequency (MHz)
Figure 14
GAIN vs FREQUENCY
(LNP (G1, G2) = 11, Various VGA Gain Capacitors)
64
63
62
61
60
59
58
57
56
55
0.1
3.9µF
0.1µF
0.022µF
4700pF
1
10
100
Frequency (MHz)
Figure 15
1000
100
OUTPUT−REFERRED NOISE vs V_CNTL
(VGA Hi Gain, R_S = 0Ω)
LNP 11
LNP 10
LNP 01
LNP 00
10
V_CNTL (V)
Figure 17
1000
100
OUTPUT−REFERRED NOISE vs V_CNTL
(VGA Lo Gain, R_S = 0Ω)
LNP 11
LNP 10
LNP 01
LNP 00
10
1000
100
10
1
0.1
V_CNTL (V)
Figure 16
INPUT−REFERRED NOISE vs V_CNTL
(LNP and VGA, Lo VGA Gain, R_S = 0Ω)
LNP 00
LNP 01
LNP 10
LNP 11
V_CNTL (V)
Figure 18
8