AD623AN Analog Devices Inc, AD623AN Datasheet

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AD623AN

Manufacturer Part Number
AD623AN
Description
IC AMP INST R-R LP 8DIP
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD623AN

Slew Rate
0.3 V/µs
Mounting Type
Through Hole
Rohs Status
RoHS non-compliant
Amplifier Type
Instrumentation
Number Of Circuits
1
Output Type
Rail-to-Rail
-3db Bandwidth
800kHz
Current - Input Bias
17nA
Voltage - Input Offset
25µV
Current - Supply
375µA
Voltage - Supply, Single/dual (±)
2.7 V ~ 12 V, ± 2.5 V ~ 6 V
Operating Temperature
-40°C ~ 85°C
Package / Case
8-DIP (0.300", 7.62mm)
No. Of Amplifiers
1
Bandwidth
0.8MHz
Amplifier Case Style
DIP
No. Of Pins
8
Operating Temperature Range
-40°C To +85°C
Programmable Gain Max
1000
Current - Output / Channel
-
Gain Bandwidth Product
-
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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AT
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FEATURES
Easy to use
Higher performance than discrete design
Single-supply and dual-supply operation
Rail-to-rail output swing
Input voltage range extends 150 mV below
Low power, 550 μA maximum supply current
Gain set with one external resistor
High accuracy dc performance
Noise: 35 nV/√Hz RTI noise @ 1 kHz (G = 1)
Excellent ac specifications
APPLICATIONS
Low power medical instrumentation
Transducer interfaces
Thermocouple amplifiers
Industrial process controls
Difference amplifiers
Low power data acquisition
GENERAL DESCRIPTION
The AD623 is an integrated single-supply instrumentation
amplifier that delivers rail-to-rail output swing on a 3 V to 12 V
supply. The AD623 offers superior user flexibility by allowing
single gain set resistor programming and by conforming to the
8-lead industry standard pinout configuration. With no external
resistor, the AD623 is configured for unity gain (G = 1), and
with an external resistor, the AD623 can be programmed for
gains up to 1000.
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.
ground (single supply)
Gain range: 1 (no resistor) to 1000
0.10% gain accuracy (G = 1)
0.35% gain accuracy (G > 1)
10 ppm maximum gain drift (G = 1)
200 μV maximum input offset voltage (AD623A)
2 μV/°C maximum input offset drift (AD623A)
100 μV maximum input offset voltage (AD623B)
1 μV/°C maximum input offset drift (AD623B)
25 nA maximum input bias current
90 dB minimum CMRR (G = 10); 70 dB minimum CMRR (G = 1)
800 kHz bandwidth (G = 1)
20 μs settling time to 0.01% (G = 10)
at 60 Hz, 1 kΩ source imbalance
Single-Supply, Rail-to-Rail, Low Cost
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
The AD623 holds errors to a minimum by providing superior
ac CMRR that increases with increasing gain. Line noise, as
well as line harmonics, are rejected because the CMRR remains
constant up to 200 Hz. The AD623 has a wide input common-
mode range and can amplify signals that have a common-mode
voltage 150 mV below ground. Although the design of the AD623
was optimized to operate from a single supply, the AD623 still
provides superior performance when operated from a dual
voltage supply (±2.5 V to ±6.0 V).
Low power consumption (1.5 mW at 3 V), wide supply voltage
range, and rail-to-rail output swing make the AD623 ideal
for battery-powered applications. The rail-to-rail output stage
maximizes the dynamic range when operating from low supply
voltages. The AD623 replaces discrete instrumentation amplifier
designs and offers superior linearity, temperature stability, and
reliability in a minimum of space.
Figure 1. 8-Lead PDIP (N), SOIC (R), and MSOP (RM) Packages
120
110
100
90
80
70
60
50
40
30
Instrumentation Amplifier
1
Figure 2. CMR vs. Frequency, 5 V
CONNECTION DIAGRAM
–R
–V
+IN
–IN
©1997–2008 Analog Devices, Inc. All rights reserved.
10
G
S
1
2
3
4
(Not to Scale)
TOP VIEW
AD623
100
FREQUENCY (Hz)
8
7
6
5
1k
+R
+V
OUTPUT
REF
G
S
S
×1000
, 0 V
10k
S
×100
www.analog.com
×1
×10
AD623
100k

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AD623AN Summary of contents

Page 1

FEATURES Easy to use Higher performance than discrete design Single-supply and dual-supply operation Rail-to-rail output swing Input voltage range extends 150 mV below ground (single supply) Low power, 550 μA maximum supply current Gain set with one external resistor Gain ...

Page 2

AD623 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Connection Diagram ....................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Single Supply ................................................................................. 3 Dual Supplies ................................................................................ 4 Both Dual and Single Supplies .................................................... 6 ...

Page 3

SPECIFICATIONS SINGLE SUPPLY Typical @ 25°C single supply and R S Table 1. Parameter Conditions GAIN (100 k/R Gain Range 1 Gain Error G1 V OUT 0. 3 ...

Page 4

AD623 Parameter Conditions INPUT Input Impedance Differential Common-Mode 2 Input Voltage Range Common-Mode Rejection with 1 kΩ Source Imbalance ...

Page 5

Parameter Conditions Nonlinearity G1 V OUT −4 +3 > −4 +4 1000 Gain vs. Temperature > 1 VOLTAGE OFFSET Total RTI error ...

Page 6

AD623 Parameter Conditions DYNAMIC RESPONSE Small Signal −3 dB Bandwidth 100 G = 1000 Slew Rate Settling Time to 0.01 ± step ...

Page 7

ABSOLUTE MAXIMUM RATINGS Table 4. Parameter Supply Voltage 1 Internal Power Dissipation Differential Input Voltage Output Short-Circuit Duration Storage Temperature Range Operating Temperature Range Lead Temperature (Soldering, 10 sec) 1 Specification is for device in free air: 8-Lead PDIP Package: ...

Page 8

AD623 TYPICAL PERFORMANCE CHARACTERISTICS At 25° ±5 V, and kΩ, unless otherwise noted 300 280 260 240 220 200 180 160 140 120 100 –100 –80 –60 –40 ...

Page 9

CMRR (dB) Figure 9. Typical Distribution for CMRR ( 100 G= 100 G= 1000 10 1 ...

Page 10

AD623 CH1 10mV A 1s Figure 15. 0 Current Noise (0.71 pA/DIV) 1µV/DIV Figure 16. 0 RTI Voltage Noise (1 DIV = 1 μV p-p) 120 110 100 ...

Page 11

V = ±2. –1 –2 –3 –4 –5 –6 –5 –4 –3 –2 –1 0 COMMON-MODE INPUT (V) Figure 21. Maximum Output Voltage vs. Common-Mode Input, G ≥ 10 ...

Page 12

AD623 ± ±2. FREQUENCY (kHz) Figure 27. Large Signal Response, G ≤ 100 GAIN (V/V) Figure 28. Settling ...

Page 13

Figure 33. Small Signal Pulse Response 20mV Figure 34. Small Signal Pulse Response 10, R 20mV Figure 35. Small Signal Pulse Response 100, R 2µ kΩ 100 ...

Page 14

AD623 50µV Figure 39. Gain Nonlinearity −100, 15 ppm/DIV V+ 1V (V+) –0.5 (V+) –1.5 (V+) –2.5 (V–) +0.5 V– Rev Page 0.5 1.0 1.5 OUTPUT CURRENT (mA) Figure 40. Output Voltage ...

Page 15

THEORY OF OPERATION The AD623 is an instrumentation amplifier based on a modified classic 3-op-amp approach, to assure single or dual supply operation even at common-mode voltages at the negative supply rail. Low voltage offsets, input and output, as well ...

Page 16

AD623 APPLICATIONS INFORMATION BASIC CONNECTION Figure 42 and Figure 43 show the basic connection circuits for the AD623. The +V and −V terminals are connected to the S S power supply. The supply can be either bipolar (V ±6 V) ...

Page 17

INPUT AND OUTPUT OFFSET VOLTAGE The low errors of the AD623 are attributed to two sources, input and output errors. The output error is divided by the programmed gain when referred to the input. In practice, the input errors dominate ...

Page 18

AD623 The circuit in Figure 45 should be built using a PC board with a ground plane on both sides. All component leads should be as short as possible. Resistors R1 and R2 can be common 1% metal film units, ...

Page 19

Ground Returns for Input Bias Currents Input bias currents are those dc currents that must flow to bias the input transistors of an amplifier. These are usually transistor base currents. When amplifying floating input sources, such as transformers or ac-coupled ...

Page 20

AD623 Amplifying Signals with Low Common-Mode Voltage Because the common-mode input range of the AD623 extends 0.1 V below ground possible to measure small differential signals which have low, or no, common-mode component. Figure 54 shows a thermocouple ...

Page 21

Table 8. Maximum Attainable Gain and Resulting Output Swing for Different Input Conditions V (V) V (V) REF Pin (V) Supply Voltages (V) CM DIFF 0 ± ±100 m 2 ± ±5 ...

Page 22

AD623 OUTLINE DIMENSIONS 0.210 (5.33) MAX 0.150 (3.81) 0.130 (3.30) 0.115 (2.92) 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE ...

Page 23

... ORDERING GUIDE Temperature Model Range AD623AN −40°C to +85°C AD623ANZ 1 −40°C to +85°C AD623AR −40°C to +85°C AD623AR-REEL −40°C to +85°C AD623AR-REEL7 −40°C to +85°C 1 AD623ARZ −40°C to +85°C 1 AD623ARZ-R7 −40°C to +85°C 1 AD623ARZ-RL − ...

Page 24

AD623 NOTES ©1997–2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D00788-0-7/08(D) Rev Page ...

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