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AD795JRZ-REEL

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21
Low Power, Low Noise
Precision FET Op Amp
AD795
Rev. C
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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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2002–2009 Analog Devices, Inc. All rights reserved.
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
CONNECTION DIAGRAM
NC
1
–IN
2
+IN
3
–V
S
4
NC
8
+V
S
7
OUTPUT
6
NC
5
NC = NO CONNECT
AD795
00845-001
Figure 1. 8-Lead SOIC (R) Package
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 10
14
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 10k
FREQUENCY (Hz)
VOLTAGE NOISE SPECTRAL DENSITY (nV/ Hz)
00845-002
Figure 2. Voltage Noise Spectral Density
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. The AD795 has a fully specified and
tested input offset voltage drift of only 10 μV/°C maximum.
The AD795 is useful for many high input impedance, low noise
applications. The AD795 is rated over the commercial tempera-
ture range of 0°C to +70°C.
The AD795 is available in an 8-lead SOIC package.
50
40
30
20
10
0
–5 –4 –3 –2 –1 0 1 2 3 4 5
INPUT OFFSET VOLTAGE DRIFT (µV/°C)
PERCENTAGE OF UNITS
00845-003
SAMPLE SIZE = 570
Figure 3. Typical Distribution of Average Input Offset Voltage Drift
AD795* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
COMPARABLE PARTS
View a parametric search of comparable parts.
EVALUATION KITS
• EVAL-OPAMP-1 Evaluation Board
DOCUMENTATION
Application Notes
• AN-202: An IC Amplifier User’s Guide to Decoupling,
Grounding, and Making Things Go Right for a Change
• AN-253: Find Op Amp Noise with Spreadsheet
• AN-256: Accurately Testing Op Amp Settling Times
• AN-356: User's Guide to Applying and Measuring
Operational Amplifier Specifications
• AN-358: Noise and Operational Amplifier Circuits
• AN-649: Using the Analog Devices Active Filter Design
Tool
Data Sheet
• AD795: Low Power, Low Noise Precision FET Op Amp Data
Sheet
TOOLS AND SIMULATIONS
• Analog Filter Wizard
• Analog Photodiode Wizard
• AD795 SPICE Macro-Model
DESIGN RESOURCES
• AD795 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
DISCUSSIONS
View all AD795 EngineerZone Discussions.
SAMPLE AND BUY
Visit the product page to see pricing options.
TECHNICAL SUPPORT
Submit a technical question or find your regional support
number.
DOCUMENT FEEDBACK
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AD795
Rev. C | Page 2 of 20
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Connection Diagram ....................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution .................................................................................. 5
Typical Performance Characteristics ............................................. 6
Minimizing Input Current ............................................................ 11
Circuit Board Notes ........................................................................ 12
Offset Nulling ............................................................................. 13
AC Response with High Value Source and Feedback Resistance
........................................................................................................... 14
Overload Issues ............................................................................... 15
Input Protection ......................................................................... 15
Preamplifier Applications.......................................................... 16
Minimizing Noise Contributions ............................................. 16
Using a T Network ..................................................................... 17
A pH Probe Buffer Amplifier ................................................... 17
Outline Dimensions ....................................................................... 18
Ordering Guide .......................................................................... 18
REVISION HISTORY
12/09—Rev. B to Rev. C
Changes to Features Section and General Description Section . 1
Changes to Input Bias Current Parameter, Table 1 ...................... 3
Changes to Table 2 ............................................................................ 5
Added Thermal Resistance Section ............................................... 5
Added Table 3; Renumbered Sequentially .................................... 5
Changes to Minimizing Input Current Section .......................... 11
Changes to Circuit Board Notes Section and Figure 33 ............ 12
Changes to Input Protection Section ........................................... 15
Changes to Ordering Guide .......................................................... 18
10/02—Rev. A to Rev. B
Deleted Plastic Mini-DIP (N) Package ............................ Universal
Edits to Features ................................................................................ 1
Edits to Specifications ...................................................................... 2
Edits to Absolute Maximum Ratings ............................................. 3
Edits to Ordering Guide .................................................................. 3
Edits to Circuit Board Notes ........................................................... 9
Edits to Figure 31 .............................................................................. 9
Edits to Offset Nulling ................................................................... 10
Deleted Figure 34 ............................................................................ 10
Deleted Low Noise Op Amp Selection Tree ............................... 15
Updated Outline Dimensions ....................................................... 15
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21

AD795JRZ-REEL

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Analog Devices Inc.
Description:
Precision Amplifiers Low Pwr Low Noise Prec FET
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