Datasheet

AD8108/AD8109
Rev. B | Page 15 of 32
INPUT IMPEDANCE (Ω)
1M 500M10M 100M100k
FREQUENCY (Hz)
30k
1M
100k
10k
1k
100
01068-036
Figure 31. AD8108 Input Impedance vs. Frequency
GAIN (dB)
–2
–4
–6
–8
0
6
4
2
8
FREQUENCY (Hz)
100M1M 10M30k 3G1G100k
V
IN
= 200mV
R
L
= 150Ω
C
L
= 18pF
C
L
= 12pF
01068-037
Figure 32. AD8108 Frequency Response vs. Capacitive Load
FLATNESS (dB)
–0.1
–0.2
–0.3
–0.4
0
0.3
0.2
0.1
0.4
0.5
FREQUENCY (Hz)
100M1M 10M30k 3G1G100k
–0.5
V
IN
= 200mV
R
L
= 150 Ω
C
L
= 12pF
C
L
= 18pF
01068-038
Figure 33. AD8108 Flatness vs. Capacitive Load
1
0
50ns/DIV
1V/DIV2V/DIV
INPUT 0 AT –1V
V
OUT
INPUT 1 AT +1V
5
–1
0
UPDATE
01068-039
Figure 34. AD8108 Switching Time
OFFSET VOLTAGE (V)
FREQUENCY
–0.020
900
800
500
400
200
0
700
600
300
100
–0.010 0.000 0.010 0.020
01068-040
Figure 35. AD8108 Offset Voltage Distribution
TEMPERATURE ( ° C)
V
OS
(mV)
–60
2.0
1.5
0.0
–1.0
–2.0
1.0
0.5
–0.5
–1.5
–40 –20 0 20 40 60 80 100
01068-041
Figure 36. AD8108 Offset Voltage Drift vs. Temperature (Normalized at 25°C)