Datasheet

AD8260
Rev. A | Page 14 of 32
0
–100
HARMONIC DISTORTION (dBc)
FREQUENCY (Hz)
100M10M1M
–40
–20
–60
–80
–120
HD2
HD3
GAIN CODE = 1011
V
OUT
= 1V p-p
07192-039
Figure 39. Harmonic Distortion (HD2, HD3) vs. Frequency for the
VGA/Preamplifier—See Figure 62
0
–100
IMD3 (dBc)
FREQUENCY (Hz)
100M10M1M
–40
–20
–60
–80
–120
LOWER
UPPER
V
OUT
= 1V p-p
TONES 1MHz APART
EACH TONE 0.5V p-p
GAIN CODE = 1011
07192-040
Figure 40. Third-Order Intermodulation Distortion (IMD3) vs. Frequency for
the VGA/Preamplifier
60
10
OIP3 (dBm)
FREQUENCY (Hz)
100M10M1M
40
50
30
20
0
LOWER
UPPER
GAIN CODE = 1011
TONES 1MHz APART
07192-041
Figure 41. OIP3 vs. Frequency for the VGA/Preamplifier
10
5
0
–5
–10
–15
–20
–25
–30
GAIN SELECT CODE
INPUT IP1dB (dBm)
1010100110000111011001010001 010000110010 1011
1MHz
10MHz
IP1dB LIMITED AT LOW GAIN BY THE
DYNAMIC RANGE OF THE PREAMPLIFIER
07192-042
Figure 42. Input 1 dB Compression (IP1dB) vs. Gain Select Code at 1 MHz and
10 MHz for the VGA/Preamplifier
07192-043
CH1 2.00VΩ
M10.0ns A CH4 180µV
1
M
T 27.2000ns
T
MATH 5.00mV 10.0ns
INPUT
OUTPUT
50mV/DIV
0V
2mV/DIV
0V
Figure 43. Small-Signal Pulse Response for the VGA/Preamplifier
07192-044
CH3 20.0mVΩ
M10.0ns A CH4 200µV
3
M
T 27.2000ns
T
MATH 50.0mV 10.0ns
INPUT
OUTPUT
500mV/DIV
0V
20mV/DIV
0V
Figure 44. Large-Signal Pulse Response for the VGA/Preamplifier