Low Noise Precision FET Op Amp
VOLTAGE NOISE SPECTRAL DENSITY (nV/ Hz)
00845-002
PERCENTAGE OF UNITS
00845-003
Data Sheet
FEATURES
Low power replaceme...
Description
VOLTAGE NOISE SPECTRAL DENSITY (nV/ Hz)
00845-002
PERCENTAGE OF UNITS
00845-003
Data Sheet
FEATURES
Low power replacement for Burr-Brown OPA111, OPA121 op amps
Low noise 3.3 μV p-p maximum, 0.1 Hz to 10 Hz 11 nV/√Hz maximum at 10 kHz 0.6 fA/√Hz at 1 kHz
High dc accuracy 500 μV maximum offset voltage 10 μV/°C maximum drift 2 pA maximum input bias current Low power: 1.5 mA maximum supply current
APPLICATIONS
Low noise photodiode preamps CT scanners Precision l-to-V converters
GENERAL DESCRIPTION
The AD795 is a low noise, precision, FET input operational amplifier. It offers both the low voltage noise and low offset drift of a bipolar input op amp and the very low bias current of a FET-input device. The 1014 Ω common-mode impedance insures that input bias current is essentially independent of common-mode voltage and supply voltage variations.
The AD795 has both excellent dc performance and a guaranteed and tested maximum input voltage noise. It features 2 pA maximum input bias current and 500 μV maximum offset voltage, along with low supply current of 1.5 mA maximum.
1k
100
10
1 10 100 1k
FREQUENCY (Hz)
Figure 2. Voltage Noise Spectral Density
10k
Low Power, Low Noise Precision FET Op Amp
AD795
CONNECTION DIAGRAM
NC 1
8 NC
–IN 2 +IN 3
7 +VS 6 OUTPUT
–VS 4 AD795 5 NC
NC = NO CONNECT
Figure 1. 8-Lead SOIC (R) Package
00845-001
Furthermore, the AD795 features a guaranteed low input noise of 3.3 μV p-p (0.1 Hz to 10 Hz) and a 11 nV/√Hz maximum noise level at 10 kHz. ...
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