Datasheet

AD8108/AD8109
Rev. B | Page 16 of 32
INPUT IMPEDANCE (
Ω
)
1M 500M10M 100M100k
FREQUENCY (Hz)
30k
1M
100k
10k
1k
100
01068-042
Figure 37. AD8109 Input Impedance vs. Frequency
–2
–4
–6
–8
0
6
4
2
8
GAIN (dB)
FREQUENCY (Hz)
100M1M 10M30k 3G1G100k
V
IN
= 100mV
R
L
= 150 Ω
C
L
= 18pF
C
L
= 12pF
01068-043
Figure 38. AD8109 Frequency Response vs. Capacitive Load
GAIN (dB)
–0.1
–0.2
–0.3
–0.4
0
0.3
0.2
0.1
0.4
FREQUENCY (Hz)
100M1M 10M30k 3G1G100k
V
IN
= 100mV
R
L
= 150 Ω
C
L
= 18pF
C
L
= 12pF
01068-044
Figure 39. AD8109 Flatness vs. Capacitive Load
1
0
50ns/DIV
1V/DIV2V/DIV
INPUT 1 AT +1V
5
–1
0
INPUT 0 AT –1V
V
OUT
UPDATE
01068-045
Figure 40. AD8109 Switching Time
40
60
80
100
120
140
160
180
200
220
240
260
280
300
320
OFFSET VOLTAGE (V)
FREQUENCY
–0.020
0
–0.010 0.000 0.010 0.020
01068-046
Figure 41. AD8109 Offset Voltage Distribution (RTI)
–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
TEMPERATURE (°C)
V
OS
(mV)
01068-047
Figure 42. AD8109 Offset Voltage Drift vs. Temperature (Normalized at 25°C)