AD8638ARJZ-R2 Analog Devices Inc, AD8638ARJZ-R2 Datasheet

IC OPAMP CHOPPER R-R SOT23-5

AD8638ARJZ-R2

Manufacturer Part Number
AD8638ARJZ-R2
Description
IC OPAMP CHOPPER R-R SOT23-5
Manufacturer
Analog Devices Inc
Datasheets

Specifications of AD8638ARJZ-R2

Slew Rate
2 V/µs
Amplifier Type
Chopper (Zero-Drift)
Number Of Circuits
1
Output Type
Rail-to-Rail
Gain Bandwidth Product
1.5MHz
Current - Input Bias
1pA
Voltage - Input Offset
3µV
Current - Supply
1.25mA
Current - Output / Channel
37mA
Voltage - Supply, Single/dual (±)
5 V ~ 16 V, ±2.5 V ~ 8 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
SOT-23-5, SC-74A, SOT-25
Op Amp Type
Wideband
No. Of Amplifiers
1
Bandwidth
1.5MHz
Supply Voltage Range
5V To 16V
Amplifier Case Style
SOT-23
No. Of Pins
5
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
-3db Bandwidth
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
FEATURES
Low offset voltage: 9 μV maximum
Offset drift: 0.04 μV/°C
Rail-to-rail output swing
+16 V single- or ±8 V dual-supply operation
High gain and CMRR: 133 dB typical
High PSRR: 143 dB typical
Very low input bias current: 40 pA
Low supply current: 1.3 mA
APPLICATIONS
Pressure and position sensors
Strain gage amplifiers
Medical instrumentation
Thermocouple amplifiers
Automotive sensors
Precision references
Precision current sensing
GENERAL DESCRIPTION
The AD8638 is a wide bandwidth, auto-zero amplifier featuring
rail-to-rail output swing and low noise. This amplifier has very
low offset, drift, and bias current. Operation is fully specified
from 5 V to 16 V single supply (±2.5 V to ±8 V dual supply).
The AD8638 provides benefits previously found only in
expensive zero-drift or chopper-stabilized amplifiers. Using
the Analog Devices, Inc., topology, these auto-zero amplifiers
combine low cost with high accuracy and low noise. No
external capacitors are required. In addition, the AD8638
greatly reduces the digital switching noise found in most
chopper-stabilized amplifiers.
With a typical offset voltage of only 3 μV, drift of less than
0.04 μV/°C, and noise of only 1.2 μV p-p (0.1 Hz to 10 Hz), the
AD8638 is suited for applications in which error sources cannot
be tolerated. Position and pressure sensors, medical equipment,
and strain gage amplifiers benefit greatly from nearly zero drift
Rev. A
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.
16 V Auto-Zero, Rail-to-Rail Output
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
over their operating temperature ranges. Many systems can take
advantage of the rail-to-rail output swing provided by the
AD8638 to maximize SNR.
The AD8638 is specified for the extended industrial tempera-
ture range (−40°C to +125°C). The AD8638 is available in tiny
5-lead SOT-23 and 8-lead SOIC packages.
The AD8638 is a member of a growing series of auto-zero op
amps offered by Analog Devices (see Table 1).
Table 1. Auto-Zero Op Amps
Supply
Single
Dual
Quad
5 V
AD8628
AD8629
AD8630
PIN CONFIGURATIONS
Operational Amplifier
OUT
–IN
+IN
NC
Figure 1. 5-Lead SOT-23 (RJ-5)
V–
+IN
Figure 2. 8-Lead SOIC_N (R-8)
V–
1
2
3
4
NC = NO CONNECT
©2007 Analog Devices, Inc. All rights reserved.
1
2
3
(Not to Scale)
(Not to Scale)
AD8638
TOP VIEW
AD8638
TOP VIEW
5 V Low Power
AD8538
AD8539
8
7
6
5
5
4
NC
V+
OUT
NC
V+
–IN
AD8638
www.analog.com
16 V
AD8638

Related parts for AD8638ARJZ-R2

AD8638ARJZ-R2 Summary of contents

Page 1

FEATURES Low offset voltage: 9 μV maximum Offset drift: 0.04 μV/°C Rail-to-rail output swing +16 V single- or ±8 V dual-supply operation High gain and CMRR: 133 dB typical High PSRR: 143 dB typical Very low input bias current: 40 ...

Page 2

AD8638 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Pin Configurations ........................................................................... 1 General Description ......................................................................... 1 Specifications ..................................................................................... 3 Electrical Characteristics—5 V Operation................................ 3 Electrical Characteristics—16 V Operation ............................. 4 Absolute Maximum Ratings ............................................................ 5 Thermal Resistance ...................................................................... ...

Page 3

SPECIFICATIONS ELECTRICAL CHARACTERISTICS—5 V OPERATION 2 25°C, unless otherwise noted Table 2. Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current Input Offset Current Input Voltage Range Common-Mode Rejection ...

Page 4

AD8638 ELECTRICAL CHARACTERISTICS—16 V OPERATION 25°C, unless otherwise noted Table 3. Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current Input Offset Current Input Voltage Range Common-Mode Rejection ...

Page 5

ABSOLUTE MAXIMUM RATINGS Table 4. Parameter Supply Voltage Input Voltage 1 Differential Input Voltage Output Short-Circuit Duration to GND Storage Temperature Range R and RJ Packages Operating Temperature Range Junction Temperature Range R and RJ Packages Lead Temperature (Soldering, 60 ...

Page 6

AD8638 TYPICAL PERFORMANCE CHARACTERISTICS 1400 < V < 25°C 1200 A 1000 800 600 400 200 0 –10 – (µV) OS Figure 3. Input Offset Voltage Distribution 25 20 ...

Page 7

TEMPERATURE (°C) Figure 9. Input Bias Current vs. Temperature 10k V = ±2. 25° 100 V – 0.1 0.001 0.01 ...

Page 8

AD8638 120 100 PHASE GAIN 20 0 –20 –40 –60 – ±2. 25°C –100 2kΩ L –120 1k 10k 100k FREQUENCY (Hz) Figure 15. Open-Loop Gain and Phase vs. ...

Page 9

FREQUENCY (Hz) Figure 21. CMRR vs. Frequency 120 V = ±2.5V SY 100 T = 25° PSRR+ 60 PSRR– –20 10 100 1k ...

Page 10

AD8638 200pF 10kΩ L TIME (2µs/DIV) Figure 27. Large Signal Transient Response 200pF 10kΩ ...

Page 11

INPUT VOLTAGE 0 OUTPUT VOLTAGE TIME (10µs/DIV) Figure 33. Positive Overload Recovery INPUT 1V 0V –1V ERROR BAND OUTPUT TIME (4µs/DIV) Figure 34. Positive Settling Time to 0. INPUT OUTPUT ERROR BAND TIME (4µs/DIV) Figure ...

Page 12

AD8638 1000 V = ±2. 25°C A 100 100 FREQUENCY (Hz) Figure 39. Voltage Noise Density 1 25°C A 1.0 0.5 0 –0.5 –1.0 –1 ...

Page 13

V = 16V 25°C A 1.0 0.5 0 –0.5 –1.0 –1 TIME (Seconds) Figure 43. 0 Noise 300 V = 16V ...

Page 14

AD8638 THEORY OF OPERATION The AD8638 is a single-supply, ultrahigh precision, rail-to-rail output operational amplifier. The typical offset voltage of less than 1 μV allows the amplifier to be easily configured for high gains without risk of excessive output voltage ...

Page 15

INPUT VOLTAGE 0 –0.05 OUTPUT VOLTAGE TIME (10µs/DIV) Figure 46. Positive Input Overload Recovery for the AD8638 0.05 INPUT VOLTAGE 0 –0.05 –0.10 –0.15 OUTPUT VOLTAGE V = ± –100 V TIME (10µs/DIV) Figure ...

Page 16

AD8638 OUTPUT AMPLIFIER FOR HIGH PRECISION DACS The AD8638 can be used as an output amplifier for a 16-bit high precision DAC in a unipolar configuration. In this case, the selected op amp needs to have very low offset voltage ...

Page 17

... PLANE COMPLIANT TO JEDEC STANDARDS MO-178-A A Figure 51. 5-Lead Small Outline Transistor Package [SOT-23] (RJ-5) Dimensions shown in millimeters ORDERING GUIDE Model Temperature Range 1 AD8638ARJZ-R2 −40°C to +125°C AD8638ARJZ-REEL 1 −40°C to +125°C 1 AD8638ARJZ-REEL7 −40°C to +125°C 1 AD8638ARZ −40°C to +125°C ...

Page 18

AD8638 NOTES Rev Page ...

Page 19

NOTES Rev Page AD8638 ...

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AD8638 NOTES ©2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06895-0-11/07(A) Rev Page ...

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