TYPICAL CHARACTERISTICS
(Cont.)
At T
A
= +25°C, V
DDA
= V
DDB
= V
DDR
= +5V, load resistance = 500Ω on each output to ground, MGS = 011, LNP = 22dB and f
IN
= 5MHz, unless otherwise noted.
The input to the preamp (LNP) is single-ended, and the output from the VCA is single-ended unless otherwise noted. This results in a 6dB reduction in signal
amplitude compared to differential operation.
INPUT-REFERRED NOISE vs VCA
CNTL
(LNP = 25dB)
24
22
20
18
Noise (nV/√Hz)
Noise (nV√Hz)
INPUT-REFERRED NOISE vs R
S
(LNP = 25dB)
10.0
R
S
= 50Ω
16
14
12
10
8
6
4
2
0
MGS = 111
MGS = 111
1.0
MGS = 011
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
VCA
CNTL
(V)
0.1
1
10
R
S
(Ω)
100
1k
NOISE FIGURE vs R
S
(LNP = 25dB)
9
8
7
Noise Figure (dB)
6
5
4
3
2
1
0
10
100
R
S
(Ω)
1k
MGS = 111
Noise Figure (dB)
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
NOISE FIGURE vs VCA
CNTL
(LNP = 25dB)
MGS = 111
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
VCA
CNTL
(V)
–30
–35
–40
–45
DISTORTION vs FREQUENCY
MGS = 000
2V
PP
DIFFERENTIAL
–30
–35
–40
DISTORTION vs FREQUENCY
MGS = 011
2V
PP
DIFFERENTIAL
Harmonic (dBc)
Distortion (dBc)
–50
–55
–60
–65
–70
–75
–80
–85
100k
V
C
= 0.2, H2
V
C
= 0.2, H3
V
C
= 3.0, H2
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
V
C
= 0.2, H2
V
C
= 0.2, H3
V
C
= 3.0, H3
V
C
= 3.0, H2
V
C
= 3.0, H3
1M
Frequency (Hz)
10M
1M
Frequency (Hz)
10M
100k
6
VCA2616, VCA2611
www.ti.com
SBOS234E
TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
