ad8260 Analog Devices, Inc., ad8260 Datasheet - Page 13

• Manufacturer Part Number: ad8260
• Description: High Current Driver Amplifier And Digital Vga/preamplifier With 3 Db Steps
• Manufacturer: Analog Devices, Inc.

Figure 34. Input-Referred Noise vs. Gain Select Code for the VGA/Preamplifier
Figure 33. Output-Referred Noise vs. Frequency for the VGA/Preamplifier at
Figure 35. Short-Circuit Input Noise vs. Frequency for the VGA/Preamplifier
100
100
10
10
10
100k
1
1
100k
0001
GAIN CODE = 1011
GAIN CODE = 1011
0010
Maximum Gain—See Figure 61
0011
0100
1M
FREQUENCY (Hz)
See Figure 61
See Figure 61
1M
FREQUENCY (Hz)
GAIN SELECT CODE
0101
0110
0111
1000
10M
10M
1001
1010
1011
50M
50M
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Figure 38. Harmonic Distortion (HD2, HD3) vs. Gain Select Code at 1 MHz
Figure 37. Harmonic Distortion (HD2, HD3) vs. Load Capacitance for the
Figure 36. Harmonic Distortion (HD2, HD3) vs. Load Resistance for the
–100
–120
–30
–40
–50
–60
–70
–80
–20
–40
–60
–80
50
30
40
60
70
80
0
0
0
and 10 MHz for the VGA/Preamplifier—See Figure 62
V
GAIN CODE = 0110
V
GAIN CODE = 0110
OUT
MAXIMUM DYNAMIC
THE PREAMPLIFIER
200
MEASUREMENT OF
OUT
HD2
HD3
HD2
HD3
INPUT RANGE OF
= 1V p-p
LIMITED BY THE
= 1V p-p
DISTORTION IS
V
400
OUT
VGA/Preamplifier—See Figure 62
VGA/Preamplifier—See Figure 62
10
= 1V p-p
600
LOAD CAPACITANCE (pF)
LOAD RESISTANCE (Ω)
GAIN SELECT CODE
800
20
0101
1000
0110
1200
30
0111
1400
HD2,
HD3,
HD2,
HD3,
1000
1600
f
f
f
f
1001
C
C
C
C
40
= 1MHz
= 1MHz
= 10MHz
= 10MHz
1010
1800
AD8260
1011
2000
50