AD795JN Analog Devices, AD795JN Datasheet

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AD795JN

Manufacturer Part Number
AD795JN
Description
Low power, low noise precision FET operational amplifier
Manufacturer
Analog Devices
Datasheet

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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 10
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 guaran-
teed and tested maximum input voltage noise. It features 1 pA
maximum input bias current and 250 mV maximum offset volt-
age, along with low supply current of 1.5 mA max.
REV. B
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
FEATURES
Low Power Replacement for Burr-Brown
OPA-111, OPA-121 Op Amps
Low Noise
High DC Accuracy
APPLICATIONS
Low Noise Photodiode Preamps
CT Scanners
Precision l-to-V Converters
2.5 V p-p max, 0.1 Hz to 10 Hz
11 nV/÷Hz max at 10 kHz
0.6 fA/÷Hz at 1 kHz
250 V max Offset Voltage
3 V/ C max Drift
1 pA max Input Bias Current
Low Power: 1.5 mA max Supply Current
100
1k
10
1
10
AD795 Voltage Noise Spectral Density
100
14
FREQUENCY – Hz
W common-mode impedance
1k
10k
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
Furthermore, the AD795 features a guaranteed low input noise
of 2.5 mV p-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 mV/∞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 SOIC.
Typical Distribution of Average Input Offset Voltage Drift
50
40
30
20
10
0
–5
SAMPLE SIZE = 570
–4
CONNECTION DIAGRAMS
8-Pin SOIC (RN) Package
–V
–IN
+IN
NC
INPUT OFFSET VOLTAGE DRIFT – mV/∞C
–3
Precision FET Op Amp
Low Power, Low Noise
S
NC = NO CONNECT
1
2
3
4
–2
AD795
–1
0
8
7
6
5
NC
+V
OUTPUT
NC
© Analog Devices, Inc., 2002
1
S
2
AD795
3
www.analog.com
4
5

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AD795JN Summary of contents

Page 1

... FREQUENCY – Hz AD795 Voltage Noise Spectral Density REV. B 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 that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices ...

Page 2

AD795–SPECIFICATIONS Parameter 1 INPUT OFFSET VOLTAGE Initial Offset Offset vs. Temperature vs. Supply (PSRR) vs. Supply (PSRR) 2 INPUT BIAS CURRENT Either Input Either Input @ T = MAX Either Input Offset Current Offset Current @ T = MAX OPEN-LOOP ...

Page 3

NOTES 1 Input offset voltage specifications are guaranteed after 5 minutes of operation Bias current specifications are guaranteed maximum at either input after 5 minutes of operation Gain = – kW. ...

Page 4

AD795–Typical Performance Characteristics 10k SUPPLY VOLTAGE – ±Volts Figure 1. Common-Mode Voltage Range vs. Supply ±15V ...

Page 5

COMMON MODE VOLTAGE – Volts Figure 7. Input Bias Current vs. Common-Mode Voltage 1kHz 12.5 VOLTAGE NOISE 10 CURRENT NOISE 7 ...

Page 6

AD795 30 25 – OUTPUT CURRENT OUTPUT CURRENT 10 5 –60 –40 – TEMPERATURE – Figure 13. Short Circuit Current Limit vs. Temperature 1000 900 800 700 600 500 400 300 200 100 ...

Page 7

FREQUENCY – Hz Figure 19. Large Signal Frequency Response – 3Vrms 10k –70 L –80 –90 –100 –110 –120 100 1k FREQUENCY – Hz Figure 21. ...

Page 8

AD795 10kW +V 0.1mF S 10kW AD795 100pF 10kW 4 0.1mF –V S Figure 24. Unity Gain Inverter +V 0.1mF AD795 6 OUT ...

Page 9

CIRCUIT BOARD NOTES The AD795 is designed for mounting on PC boards. Maintaining picoampere resolution in those environments requires a lot of care. Both the board and the amplifier’s package have finite resistance. Voltage differences between the input pins and ...

Page 10

AD795 Leakage through the bulk of the circuit board will still occur with the guarding schemes shown in Figures 31 and 32. Stan- dard “G10” type printed circuit board material may not have high enough volume resistivity to hold leakages ...

Page 11

AC RESPONSE WITH HIGH VALUE SOURCE AND FEEDBACK RESISTANCE Source and feedback resistances greater than 100 kW will magnify the effect of input capacitances (stray and inherent to the AD795) on the ac behavior of the circuit. The effects of ...

Page 12

... In order to achieve the low input bias currents of the AD795 not possible to use the same on-chip protection as used in other Analog Devices op amps. This makes the AD795 sensitive to handling and precautions should be taken to minimize ESD exposure whenever possible. ...

Page 13

W 9 GUARD 2 AD795 PHOTODIODE 3 8 Figure 42. The AD795 Used as a Photodiode Preamplifier Preamplifier Applications The low input current and offset voltage levels of the AD795 together with its low voltage noise make this ...

Page 14

AD795 10mV & SIGNAL BANDWIDTH 1mV i n WITH FILTER NO FILTER 100nV 10nV 1 10 100 FREQUENCY – Hz Figure 45. Voltage Noise Spectral Density of the Circuit of Figure 44 With ...

Page 15

COPLANARITY All brand or product names mentioned are trademarks or registered trademarks of their respective holders. REV. B OUTLINE DIMENSIONS 8-Lead Standard Small Outline Package [SOIC] Narrow Body (RN-8) Dimensions shown in millimeters and (inches) 5.00 ...

Page 16

AD795 Revision History Location 10/02–Data Sheet changed from REV REV. B Deleted Plastic Mini-DIP (N) Package . . . . . . . . . . . . . . . . . . . . . . ...

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