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250
200
150
100
50
0
1.2
Noise(nV/
)ÖHz
V (V)
CNTRL
0
0.20.1
PGA= 30dB
PGA= 20dB
1.11.00.90.3 0.4 0.5 0.6 0.7 0.8
Frequency=5MHz
120
110
100
90
80
70
60
50
40
30
20
10
0
1.2
Noise(nV/
)ÖHz
V (V)
CNTRL
0
0.20.1
PGA=20dB
PGA= 30dB
1.11.00.90.3 0.4 0.5 0.6 0.7 0.8
Frequency=2MHz
120
110
100
90
80
70
60
50
40
30
20
10
0
1.2
Noise(nV/
)ÖHz
V (V)
CNTRL
0
0.20.1
PGA= 30dB
PGA= 20dB
1.11.00.90.3 0.4 0.5 0.6 0.7 0.8
Frequency=5MHz
4.0
3.8
3.6
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
20
CurrentNoise(pA/ )Ö
Hz
Frequency(MHz)
1
R =
S
400W
10
R =
S
1kW
R =200W
S
V =1.2V
CNTRL
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
20
Noise(nV/ )ÖHz
Frequency(MHz)
1
R =
S
200W
R =
S
400W
10
R =
S
1kW
R =50W
S
V =1.2V
CNTRL
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
20
Noise(nV/ )Ö
Hz
Frequency(MHz)
1
R =200W
S
R =
S
400W
10
R =
S
1kW
R =
S
50W
V =1.2V
CNTRL
VCA8500
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 (1 µ F) input configuration
to the preamp (LNA), f
IN
= 5MHz, V
CNTL
= 1.0V, clamp disabled (CL = 1), LPF = 15MHz, and R
LOAD
= 1k Ω on each output to
ground, unless otherwise noted.
OUTPUT-REFERRED NOISE vs V
CNTRL
INPUT-REFERRED NOISE vs V
CNTRL
Figure 20. Figure 21.
INPUT-REFERRED NOISE vs V
CNTRL
CURRENT NOISE vs FREQUENCY OVER R
SOURCE
Figure 22. Figure 23.
OUTPUT-REFERRED NOISE vs FREQUENCY OVER R
S
INPUT-REFERRED NOISE vs FREQUENCY OVER R
S
Figure 24. Figure 25.
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