Datasheet
AD621
REV. B
–6–
FREQUENCY – Hz
1000
100
1
10
CURRENT NOISE – nV/ Hz
100
1000
10
TPC 7. Current Noise Spectral Density vs. Frequency
TIME – 1 sec/div
RTI NOISE – 0.2V/div
TPC 8a. 0.1 Hz to 10 Hz RTI Voltage Noise, Gain = 10
TIME – 1 sec/div
RTI NOISE – 0.1V/div
TPC 8b. 0.1 Hz to 10 Hz RTI Voltage Noise, G = 100
10
0%
100
90
1s
100mV
TPC 9. 0.1 Hz to 10 Hz Current Noise, 5 pA per Vertical
Div, 1 Second per Horizontal Div
100
1000
AD621A
FET INPUT
IN AMP
SOURCE RESISTANCE – ⍀
TOTAL DRIFT FROM 25ⴗC TO 85ⴗC, RTI – V
100,000
10
1k 10M
10,000
10k 1M100k
TPC 10. Total Drift vs. Source Resistance
FREQUENCY – Hz
0.1 1M1 10 100 1k 10k 100k
160
0
CMR – dB
140
80
60
40
20
120
100
GAIN = 100
GAIN = 10
TPC 11. CMR vs. Frequency, RTI, for a Zero to 1 k
Ω
Source Imbalance