Datasheet
AD8555
Rev. A | Page 12 of 28
04598-0-021
FREQUENCY (kHz)
5002500
VOLTAGE NOISE DENSITY (nV/ Hz)
30
25
20
15
10
5
V
S
= ±2.5V
GAIN = 70
35
Figure 22. Input Voltage Noise Density vs. Frequency (0 Hz to 500 kHz)
04598-0-023
TIME (1s/DIV)
NOISE (μV)
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
V
S
= ±2.5V
GAIN = 1000
Figure 23. Low Frequency Input Voltage Noise (0.1 Hz to 10 Hz)
Figure 24. Low Frequency Input Voltage Noise (0.1 Hz to 10 Hz)
04598-0-025
FREQUENCY (Hz)
1k 100k10k 1M
GAIN = 1280
GAIN = 70
V
S
= ±2.5V
C
L
= 40PF
CLOSED-LOOP GAIN (dB)
60
40
20
0
Figure 25. Closed-Loop Gain vs. Frequency Measured at Filter Pin
04598-0-026
FREQUENCY (Hz)
1k 100k10k 1M
GAIN = 70
GAIN = 1280
V
S
= ±2.5V
CLOSED-LOOP GAIN (dB)
60
40
20
0
Figure 26. Closed-Loop Gain vs. Frequency Measured at Output Pin
04598-0-027
FREQUENCY (Hz)
1k 100k10k 1M 10M
V
S
= ±2.5V
GAIN (dB)
4
8
0
–4
–8
Figure 27. Output Buffer Gain vs. Frequency