Datasheet

AD8556
Rev. A | Page 11 of 28
05448-023
TIME (1s/DIV)
NOISE (µV)
0.6
0.4
0.2
–0.2
0
–0.4
–0.6
V
SY
= ±2.5V
GAIN = 70
Figure 22. Low Frequency Input Voltage Noise (0.1 Hz to 10 Hz)
05448-024
FREQUENCY (Hz)
1k 100k10k 1M
GAIN = 1280
GAIN = 70
V
SY
= ±2.5V
C
L
= 40pF
CLOSED-LOOP GAIN (dB)
60
40
20
0
Figure 23. Closed-Loop Gain vs. Frequency Measured at FILT/DIGOUT Pin
05448-025
FREQUENCY (Hz)
1k 100k10k 1M
GAIN = 70
GAIN = 1280
V
SY
= ±2.5V
CLOSED-LOOP GAIN (dB)
60
40
20
0
Figure 24. Closed-Loop Gain vs. Frequency Measured at VOUT Pin
05448-026
FREQUENCY (Hz)
1k 100k10k 1M 10M
V
SY
= ±2.5V
GAIN (dB)
4
8
0
–4
–8
Figure 25. Output Buffer Gain vs. Frequency
05448-027
LOAD CAPACITANCE (nF)
1000.1 1 10
OVERSHOOT (%)
60
50
40
30
20
10
0
R
S
C
L
OUTPUT
BUFFER
V
SY
= ±2.5V
R
S
= 0Ω
R
S
= 10Ω
R
S
= 20Ω
R
S
= 50Ω
R
S
= 100Ω
Figure 26. Output Buffer Positive Overshoot
05448-028
LOAD CAPACITANCE (nF)
100.00.1 1.0 10.0
OVERSHOOT (%)
60
50
40
30
20
10
0
R
S
C
L
V
SY
= ±2.5V
R
S
= 0Ω
R
S
= 10Ω
R
S
= 20Ω
R
S
= 50Ω
R
S
= 100Ω
Figure 27. Output Buffer Negative Overshoot