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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

20

15

10

5

0 10

10k

8-Pin SOIC (R) Package NC 1

8 NC

–IN 2

7 +VS

+IN 3

APPLICATIONS Low Noise Photodiode Preamps CT Scanners Precision l-to-V Converters

6 OUTPUT

–V S 4

5 NC

AD795

NC = NO CONNECT

PRODUCT 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 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

10

30

20

10

1 10

100 1k FREQUENCY – Hz

10k

0 –5

–4

–3

–2

–1

0

1

2

3

4

5

INPUT OFFSET VOLTAGE DRIFT – µV/°C

AD795 Voltage Noise Spectral Density

Typical Distribution of Average Input Offset Voltage Drift

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703

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