Datasheet

AD8260
Rev. A | Page 12 of 32
27
24
21
18
15
12
9
6
3
0
–3
–12
–6
–9
100k 1M 10M 100M 200M
FREQUENCY (Hz)
DIFFERENTIAL GAIN (dB)
07192-027
1011
1010
1001
1000
0111
0110
0101
0100
0011
0010
0001
Figure 27. Frequency Response for a Supply Voltage (V
S
) of 3.3 V for all Codes
of the VGA/Preamplifier—See Figure 59
27
24
21
18
15
12
9
6
3
0
–3
–12
–6
–9
100k 1M 10M 100M 200M
FREQUENCY (Hz)
DIFFERENTIAL GAIN (dB)
07192-028
1011
1010
1001
1000
0111
0110
0101
0100
0011
0010
0001
V
S
= 5V
Figure 28. Frequency Response for a Supply Voltage (V
S
) of 5 V for All Codes
for the VGA/Preamplifier—See Figure 59
27
24
21
18
15
12
9
6
3
0
–3
–12
–6
–9
100k 1M 10M 100M 200M
FREQUENCY (Hz)
DIFFERENTIAL GAIN (dB)
07192-029
1011
1010
1001
1000
0111
0110
0101
0100
0011
0010
0001
V
S
= ±5V
Figure 29. Frequency Response for a Dual Supply (V
S
) = ±5 V for All Codes for
the VGA/Preamplifier—See Figure 59
10
8
6
4
2
0
1M 10M 100M
FREQUENCY (Hz)
GROUP DELAY (ns)
07192-030
Figure 30. Group Delay vs. Frequency for the VGA/Preamplifier
See Figure 59
100
OUTPUT RESISTANCE (Ω)
FREQUENCY (Hz)
100M
0.1
1M100k 10M
VGAP
10
1
VGAN
07192-031
Figure 31. Output Resistance vs. Frequency for the VGA/Preamplifier
See Figure 60
10
50
20
30
40
GAIN SELECT CODE
OUTPUT-REFERRED NOISE (nV/√Hz)
1010100110000111011001010001 010000110010 1011
07192-032
Figure 32. Output-Referred Noise vs. Gain Select Code for the
VGA/Preamplifier—See Figure 61