AD795

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. ...