AD8675 Analog Devices, AD8675 Datasheet

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AD8675

Manufacturer Part Number
AD8675
Description
36 V Precision, 2.8 nV/?Hz Rail-to-Rail Output Op Amp
Manufacturer
Analog Devices
Datasheet

Specifications of AD8675

-3db Bandwidth
10MHz
Slew Rate
2.5V/µs
Vos
10µV
Ib
0.5nA
# Opamps Per Pkg
1
Input Noise (nv/rthz)
2.8nV/rtHz
Vcc-vee
10V to 36V
Isy Per Amplifier
2.9mA
Packages
SOIC,SOP

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Data Sheet
FEATURES
Very low voltage noise: 2.8 nV/√Hz
Rail-to-rail output swing
Low input bias current: 2 nA maximum
Very low offset voltage: 75 μV maximum
Low input offset drift: 0.6 μV/°C maximum
Very high gain: 120 dB
Wide bandwidth: 10 MHz typical
±5 V to ±18 V operation
APPLICATIONS
Precision instrumentation
PLL filters
Laser diode control loops
Strain gage amplifiers
Medical instrumentation
Thermocouple amplifiers
GENERAL DESCRIPTION
The AD8675 precision operational amplifier has ultralow offset,
drift, and voltage noise combined with very low input bias currents
over the full operating temperature range. The AD8675 is a
precision, wide bandwidth op amp featuring rail-to-rail output
swings and very low noise. Operation is fully specified from
±5 V to ±15 V.
The AD8675 features a rail-to-rail output like that of the OP184,
but with wide bandwidth and even lower voltage noise, combined
with the precision and low power consumption like that of the
industry-standard OP07 amplifier. Unlike other low noise, rail-
to-rail op amps, the AD8675 has very low input bias current
and low input current noise.
With typical offset voltage of only 10 μV, offset drift of 0.2 μV/°C,
and noise of only 0.10 μV p-p (0.1 Hz to 10 Hz), the AD8675 is
perfectly suited for applications where large error sources cannot
be tolerated. For applications with even lower offset tolerances,
the proprietary nulling capability allows a combination of both
device and system offset errors up to 3.5 mV (referred to the
input) to be compensated externally. Unlike previous circuits,
the AD8675 accommodates this adjustment without adversely
affecting the offset drift, CMRR, and PSRR of the amplifier.
Precision instrumentation, PLL, and other precision filter circuits,
position and pressure sensors, medical instrumentation, and
strain gage amplifiers benefit greatly from the very low noise,
low input bias current, and wide bandwidth. Many systems can
Rev. D
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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
take advantage of the low noise, dc precision, and rail-to-rail
output swing provided by the AD8675 to maximize SNR and
dynamic range.
The smaller packages and low power consumption afforded by
the AD8675 allow maximum channel density or minimum
board size for space-critical equipment.
The AD8675 is specified for the extended industrial temperature
range (−40°C to +125°C). The AD8675 amplifier is available in
the tiny 8-lead MSOP, and the popular 8-lead, narrow SOIC,
RoHS compliant packages. MSOP packaged devices are only
available in tape and reel format.
For the dual version of this ultraprecision, rail-to-rail op amp,
see the
The AD8675 and AD8676 are members of a growing series of
low noise op amps offered by Analog Devices, Inc.
Table 1. Voltage Noise
Package
Single
Dual
Quad
Rail-to-Rail Output Op Amp
36 V Precision, 2.8 nV/√Hz
AD8676
0.9 nV
AD797
NULL
NULL
data sheet.
+IN
–IN
–IN
+IN
V–
PIN CONFIGURATIONS
V–
©2005–2011 Analog Devices, Inc. All rights reserved.
Figure 2. 8-Lead MSOP (RM-8)
Figure 1. 8-Lead SOIC_N (R-8)
1.1 nV
AD8597
AD8599
1
2
3
4
1
2
3
4
NC = NO CONNECT
NC = NO CONNECT
(Not to Scale)
(Not to Scale)
AD8675
TOP VIEW
AD8675
TOP VIEW
1.8 nV
ADA4004-1
ADA4004-2
ADA4004-4
8
7
6
5
8
7
6
5
NULL
V+
OUT
NC
NULL
V+
OUT
NC
2.8 nV
AD8675
AD8676
AD8675
www.analog.com
3.8 nV
AD8671
AD8672
AD8674

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AD8675 Summary of contents

Page 1

... AD8675 has very low input bias current and low input current noise. With typical offset voltage of only 10 μV, offset drift of 0.2 μV/°C, and noise of only 0.10 μV p-p (0 Hz), the AD8675 is perfectly suited for applications where large error sources cannot be tolerated. For applications with even lower offset tolerances, the proprietary nulling capability allows a combination of both device and system offset errors ...

Page 2

... AD8675 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Pin Configurations ........................................................................... 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Electrical Specifications ............................................................... 3 REVISION HISTORY 8/11—Rev Rev. D Added Input Capacitance, Common Mode Parameter and Input Capacitance, Differential Mode Parameter, Table 3 ..................... 4 6/10—Rev Rev. C Changes to Figure 10 ........................................................................ 7 5/10—Rev Rev. B Changes to General Description Section ...................................... 1 Added Table 1 ...

Page 3

... −40°C ≤ T ≤ +125° kΩ L GBP kHz Rev Page AD8675 Min Typ Max Unit 10 75 µV 12 240 µV 0.2 0.6 µV/°C −2 +0 −5.5 −2 +5.5 nA −1 +0 − ...

Page 4

... AD8675 V = ± +25°C, unless otherwise specified Table 3. Parameter INPUT CHARACTERISTICS Offset Voltage Offset Voltage Drift Input Bias Current Input Offset Current Input Voltage Range Common-Mode Rejection Ratio Open-Loop Gain Input Capacitance, Common Mode Input Capacitance, Differential Mode ...

Page 5

... Table 5. Thermal Resistance Indefinite Package Type 8-Lead MSOP (RM-8) −65°C to +150°C 8-Lead SOIC_N (R-8) −40°C to +125°C −65°C to +150°C ESD CAUTION 300°C <50 µA, V < Rev Page AD8675 θ θ Unit JA JC 142 45 °C/W 120 45 °C/W ...

Page 6

... AD8675 TYPICAL PERFORMANCE CHARACTERISTICS ±15 V and ± 25°C, unless otherwise specified 100 1k FREQUENCY (Hz) Figure 3. Voltage Noise Density vs. Frequency –100 –80 –60 –40 – (µV) OS Figure 4. Input Offset Voltage Distribution ...

Page 7

... FREQUENCY (Hz) Figure 12. Gain and Phase vs. Frequency G = 100 10k 100k 1M 10M FREQUENCY (Hz) Figure 13. Closed-Loop Gain vs. Frequency A = 100 10k 100k 1M 10M FREQUENCY (Hz) Figure 14. Z vs. Frequency OUT AD8675 180 120 60 0 –60 –120 –180 100M 100M 100M ...

Page 8

... AD8675 –5 –10 –15 TIME (10µs/DIV) Figure 15. Large-Signal Transient Response –1 –2 –3 –4 TIME (10µs/DIV) Figure 16. Large-Signal Transient Response 100mV p + 100 1k CAPACITANCE (pF) Figure 17. Small-Signal Overshoot vs. Load Capacitance ...

Page 9

... LOAD CURRENT (mA) Figure 24. Output Saturation Voltage vs. Output Current V OH – TEMPERATURE (°C) Figure 25. Swing vs. Temperature – TEMPERATURE (°C) Figure 26. Swing vs. Temperature AD8675 100 V = ±15V S = 2kΩ 100 120 V = ±15V S = 2kΩ 100 120 ...

Page 10

... AD8675 0.01 = 2kΩ rms 80kHz 0.001 0.0001 V = 15V S 0.00001 10 100 1k FREQUENCY (Hz) Figure 27. Distortion vs. Frequency 10k 100k Rev Page Data Sheet ...

Page 11

... Data Sheet TEST CIRCUIT 100kΩ – AD8675 INPUT OUTPUT TRIM RANGE IS OS TYPICALLY ±3.5mV V– Figure 28. Optional Offset Nulling Circuit Rev Page AD8675 ...

Page 12

... Temperature Range AD8675ARMZ −40°C to +125°C AD8675ARMZ-REEL −40°C to +125°C AD8675ARZ −40°C to +125°C AD8675ARZ-REEL −40°C to +125°C AD8675ARZ-REEL7 −40°C to +125° RoHS Compliant Part. ©2005–2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners ...

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