Datasheet

AD549
Rev. H | Page 7 of 20
3000
1000
300
100
–55 –25 5 35 65 95 125
00511-008
TEMPERATURE (°C)
OPEN-LOOP GAIN (V/mV)
Figure 8. Open-Loop Gain vs. Temperature
30
25
20
15
10
5
0
01234567
00511-009
WARM-UP TIME (Minutes)
ΔIV
OS
I (µV)
Figure 9. Change in Offset Voltage vs. Warm-Up Time
50
45
40
35
30
25
20
–10 –5 0 5 10
00511-010
COMMON-MODE VOLTAGE (V)
INPUT CURRENT (fA)
Figure 10. Input Bias Current vs. Common-Mode Voltage
50
45
40
35
30
25
20
0 5 10 15 20
00511-011
POWER SUPPLY VOLTAGE (±V)
INPUT CURRENT (fA)
Figure 11. Input Bias Current vs. Power Supply Voltage
160
140
120
100
80
60
40
20
10 100 1k 10k
00511-012
FREQUENCY (Hz)
NOISE SPECTRAL DENSITY (nV/ Hz)
Figure 12. Input Voltage Noise Spectral Density
100k
10k
1k
100
10
1
0.1
100k 1M 10M 100M 1G 10G 100G
00511-013
SOURCE RESISTANCE (Ω)
INPUT NOISE VOLTAGE (µV p-p)
WHENEVER JOHNSON NOISE IS GREATER THAN
AMPLIFIER NOISE, AMPLIFIER NOISE CAN BE
CONSIDERED NEGLIGIBLE FOR THE APPLICATION
RESISTOR
JOHNSON NOISE
10Hz BANDWIDTH
AMPLIFIER GENERATED NOISE
1kHz BANDWIDTH
Figure 13. Noise vs. Source Resistance