OPA27CZ Datasheet, PDF (13/22 Pages) Texas Instruments – Ultra-Low Noise, Precision OPERATIONAL AMPLIFIERS

Gain = –1010V/V
V_OS ≈ 2µV
Drift ≈ 0.07µV/°C
e_n ≈ 1nV/√Hz at 10Hz
0.9nV/√Hz at 100Hz
0.87nV/√Hz at 1kHz
Full Power Bandwidth ≈ 180kHz
Gain Bandwidth ≈ 500MHz
Equivalent Noise Resistance ≈ 50Ω
Input
20Ω
2kΩ
2
6
OPA37
3
Signal-to-Noise Ratio ∝ √N
since amplifier noise is
uncorrelated.
2kΩ
20Ω
2kΩ
2
6
2kΩ
3 ^OPA37
20Ω
2kΩ
2kΩ
2
6
2kΩ
OPA37
3
20Ω
2kΩ
2
6
OPA37
3
Output
2
6
2kΩ
3 ^OPA37
20Ω
2kΩ
2
6
2kΩ
OPA37
3
N = 10 Each OPA37
FIGURE 16. Ultra-Low Noise “N”-Stage Parallel Amplifier.
OPA27, OPA37
13
SBOS135C
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