TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VDDA = VDDB = VDDR = +5V, load resistance = 500Ω on each output to ground, MGS = 011, LNP = 22dB and fIN = 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.
GAIN vs FREQUENCY
GAIN vs FREQUENCY
(Pre-Amp)
VCA
(VCACNTL = 0.2V)
30
25
20
15
10
5
5.0
4.0
LNA = 25dB
LNA = 22dB
3.0
2.0
1.0
MGS = 111
MGS = 100
0.0
LNA = 17dB
–1.0
–2.0
–3.0
–4.0
–5.0
MGS = 011
MGS = 000
LNA = 5dB
10M
0
100k
1M
100M
100M
100M
100k
1M
10M
100M
Frequency (Hz)
Frequency (Hz)
GAIN vs FREQUENCY
LNA and VCA
(VCACNTL = 3.0V)
GAIN vs FREQUENCY
VCA
(VCACNTL = 3.0V)
45
40
35
30
25
20
15
10
5
60
50
40
30
20
10
0
LNP = 25dB
LNP = 22dB
MGS = 111
MGS = 100
LNP = 17dB
LNP = 5dB
MGS = 011
MGS = 000
0
100k
1M
10M
100k
1M
10M
100M
Frequency (Hz)
Frequency (Hz)
GAIN vs FREQUENCY
LNA and VCA
OUTPUT-REFERRED NOISE vs VCACNTL
(LNP = 25dB)
(LNP = 22dB)
60
50
40
30
20
10
0
2000
1800
1600
1400
1200
1000
800
RS= 50Ω
VCNTL = 3.0V
VCNTL = 1.6V
MGS = 111
600
400
VCNTL = 0.2V
200
MGS = 011
0
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
VCACNTL (V)
100k
1M
10M
Frequency (Hz)
VCA2616, VCA2611
5
SBOS234E
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TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
