Low Power, Low Noise Precision FET Op Amp AD795
FEATURES Low Power Replacement for Burr-Brown OPA-111, OPA-121 Op Amps Low Noise 2.5 V p max, 0.1 Hz to 10 Hz 11 nV/√Hz max at 10 kHz 0.6 fA/√Hz at 1 kHz High DC Accuracy 250 V max Offset Voltage 3 V/؇C max Drift 1 pA max Input Bias Current Low Power: 1.5 mA max Supply Current Available in Low Cost Plastic Mini-DIP and Surface Mount (SOIC) Packages
CONNECTION DIAGRAMS 8-Pin Plastic Mini-DIP (N) Package OUTPUT VOLTAGE SWING – Volts p
30 Vs = ±15V 25
8-Pin SOIC (R) Package NC 1
APPLICATIONS Low Noise Photodiode Preamps CT Scanners Precision l-to-V Converters
–V S 4
NC = NO CONNECT
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 1 pA maximum input bias current and 250 µV maximum offset voltage, along with low supply current of 1.5 mA max.
Furthermore, the AD795 features a guaranteed low input noise of 2.5 µV p (0.1 Hz to 10 Hz) and a 11 nV/√Hz max noise level at 10 kHz. The AD795 has a fully specified and tested input offset voltage drift of only 3 µV/°C max. The AD795 is useful for many high input impedance, low noise applications. The AD795J and AD795K are rated over the commercial temperature range of 0°C to +70°C. The AD795 is available in 8-pin plastic mini-DIP and 8-pin surface mount (SOIC) packages.
1k 50 SAMPLE SIZE = 570 40 PERCENTAGE OF UNITS
VOLTAGE NOISE SPECTRAL DENSITY – nV/√Hz
100 1k LOAD RESISTANCE – Ω
100 1k FREQUENCY – Hz
INPUT OFFSET VOLTAGE DRIFT – µV/°C
AD795 Voltage Noise Spectral Density
Typical Distribution of Average Input Offset Voltage Drift
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