Ultra-Low Offset
Voltage Operational Amplifier
-
INPUT
+
20kΩ
1
2
8
76
MAX400
3
4
V-
V+
OUTPUT
Figure 1. Optional Offset Nulling Circuit
100Ω
100Ω
V+
2
7
MAX400
3
4
V-
2.5MΩ
3.3kΩ
6
OUTPUT
4.7µF
(≈10Hz FILTER)
INPUT-REFERRED NOISE = V0
25,000
Figure 2. Low-Frequency Noise Test Circuit
28
24
20
16
12
8
4
0
1k
MAXIMUM OUTPUT SWING
vs. FREQUENCY
VS = ±15V
TA = +25°C
10k
100k
1M
FREQUENCY (Hz)
Typical Operating Characteristics
LOW-FREQUENCY NOISE
MAX400 toc02
TOTAL INPUT NOISE VOLTAGE
vs. FREQUENCY
1000
RS1 = RS2 = 200kΩ
THERMAL NOISE OF SOURCE
RESISTORS INCLUDED
100
RESISTORS EXCLUDED
RS = 0Ω
10
VS = ±15V
TA = +25°C
1
1
10
100
1k
FREQUENCY (Hz)
4 _______________________________________________________________________________________