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Analog Devices Semiconductor Electronic Components Datasheet

AD8574 Datasheet

Rail-to-Rail Input/Output Operational Amplifiers

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Data Sheet
Zero-Drift, Single-Supply, Rail-to-Rail
Input/Output Operational Amplifiers
AD8571/AD8572/AD8574
FEATURES
Low offset voltage: 1 μV
Input offset drift: 0.005 μV/°C
Rail-to-rail input and output swing
5 V/2.7 V single-supply operation
High gain: 145 dB typical
CMRR: 140 dB typical
PSRR: 130 dB typical
Ultralow input bias current: 10 pA typical
Low supply current: 750 μA per op amp
Overload recovery time: 50 μs
No external capacitors required
APPLICATIONS
Temperature sensors
Pressure sensors
Precision current sensing
Strain gage amplifiers
Medical instrumentation
Thermocouple amplifiers
GENERAL DESCRIPTION
This family of amplifiers has ultralow offset, drift, and bias
current. The AD8571/AD8572/AD85741 are single, dual, and
quad amplifiers, respectively, featuring rail-to-rail input and
output swings. All are guaranteed to operate from 2.7 V to 5 V
single supply.
The AD8571/AD8572/AD8574 provide benefits previously
found only in expensive auto-zeroing or chopper-stabilized
amplifiers. Using Analog Devices, Inc., topology, these zero-
drift amplifiers combine low cost with high accuracy. (No
external capacitors are required.) Using a spread-spectrum,
auto-zero technique, the AD8571/AD8572/AD8574 eliminate
the intermodulation effects from interaction of the chopping
function with the signal frequency in ac applications.
With an offset voltage of only 1 μV and drift of 0.005 μV/°C, the
AD8571/AD8572/AD8574 are perfectly suited for applications
where error sources cannot be tolerated. Position and pressure
sensors, medical equipment, and strain gage amplifiers benefit
greatly from nearly zero drift over their operating temperature
range. Many more systems require the rail-to-rail input and
output swings provided by the AD8571/AD8572/AD8574.
1 Protected by U.S. Patent 6,130,578.
Rev. F
Document Feedback
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
PIN CONFIGURATIONS
NC 1
8 NC
–IN A 2 AD8571 7 V+
+IN A
3
TOP VIEW
(Not to Scale)
6
OUT A
V– 4
5 NC
NC = NO CONNECT
Figure 1. 8-Lead MSOP (RM Suffix)
NC 1
8 NC
–IN A 2 AD8571 7 V+
+IN A 3 TOP VIEW 6 OUT A
V– 4 (Not to Scale) 5 NC
NC = NO CONNECT
Figure 2. 8-Lead SOIC (R Suffix)
OUT A 1
8 V+
–IN A 2 AD8572 7 OUT B
+IN A
3
TOP VIEW
(Not to Scale)
6
–IN B
V– 4
5 +IN B
Figure 3. 8-Lead TSSOP (RU Suffix)
OUT A 1
8 V+
–IN A 2 AD8572 7 OUT B
+IN A
3
TOP VIEW
(Not to Scale)
6
–IN B
V– 4
5 +IN B
Figure 4. 8-Lead SOIC (R Suffix)
OUT A 1
14 OUT D
–IN A 2
13 –IN D
+IN A 3 AD8574 12 +IN D
V+ 4 TOP VIEW 11 V–
+IN B 5 (Not to Scale) 10 +IN C
–IN B 6
9 –IN C
OUT B 7
8 OUT C
Figure 5. 14-Lead TSSOP (RU Suffix)
OUT A 1
14 OUT D
–IN A 2
13 –IN D
+IN A 3 AD8574 12 +IN D
V+ 4 TOP VIEW 11 V–
+IN B 5 (Not to Scale) 10 +IN C
–IN B 6
9 –IN C
OUT B 7
8 OUT C
Figure 6. 14-Lead SOIC (R Suffix)
The AD8571/AD8572/AD8574 are specified for the extended
industrial/ automotive temperature range (−40°C to +125°C).
The AD8571 single amplifier is available in 8-lead MSOP and
narrow SOIC packages. The AD8572 dual amplifier is available in
8-lead narrow SOIC and surface-mount TSSOP packages. The
AD8574 quad amplifier is available in 14-lead narrow SOIC and
TSSOP packages.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©1999–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

AD8574 Datasheet

Rail-to-Rail Input/Output Operational Amplifiers

No Preview Available !

AD8571/AD8572/AD8574
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Pin Configurations ........................................................................... 1
Revision History ............................................................................... 3
Specifications..................................................................................... 4
5 V Electrical Characteristics...................................................... 4
2.7 V Electrical Characteristics................................................... 5
Absolute Maximum Ratings............................................................ 6
Thermal Characteristics .............................................................. 6
ESD Caution.................................................................................. 6
Typical Performance Characteristics ............................................. 7
Functional Description .................................................................. 15
Amplifier Architecture .............................................................. 15
Basic Auto-Zero Amplifier Theory.......................................... 15
Auto-Zero Phase......................................................................... 16
Amplification Phase ................................................................... 16
High Gain, CMRR, and PSRR .................................................. 17
Data Sheet
Maximizing Performance Through Proper Layout ............... 17
1/f Noise Characteristics ........................................................... 18
Random Auto-Zero Correction Eliminates Intermodulation
Distortion .................................................................................... 18
Broadband and External Resistor Noise Considerations.......... 19
Output Overdrive Recovery...................................................... 19
Input Overvoltage Protection ................................................... 19
Output Phase Reversal............................................................... 19
Capacitive Load Drive ............................................................... 20
Power-Up Behavior.................................................................... 20
Applications Information .............................................................. 21
5 V Precision Strain Gage Circuit ............................................ 21
3 V Instrumentation Amplifier ................................................ 21
High Accuracy Thermocouple Amplifier ............................... 22
Precision Current Meter............................................................ 22
Precision Voltage Comparator.................................................. 22
Outline Dimensions ....................................................................... 23
Ordering Guide .......................................................................... 25
Rev. F | Page 2 of 28


Part Number AD8574
Description Rail-to-Rail Input/Output Operational Amplifiers
Maker Analog Devices
Total Page 28 Pages
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