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AD8293G160BRJZ-RL

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
Low Cost, Zero-Drift In-Amp
with Filter and Fixed Gain
AD8293G80/AD8293G160
Rev. 0
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 www.analog.com
Fax: 781.461.3113 ©2008 Analog Devices, Inc. All rights reserved.
FEATURES
Small package: 8-lead SOT-23
Reduced component count
Incorporates gain resistors and filter resistors
Low offset voltage: 20 μV maximum
Low offset drift: 0.3 μV/°C maximum
Low gain drift: 25 ppm/°C maximum
High CMR: 140 dB typical
Low noise: 0.7 μV p-p from 0.01 Hz to 10 Hz
Single-supply operation: 1.8 V to 5.5 V
Rail-to-rail output
Available in 2 fixed-gain models
APPLICATIONS
Current sensing
Strain gauges
Laser diode control loops
Portable medical instruments
Thermocouple amplifiers
FUNCTIONAL BLOCK DIAGRAM
1
8
7 5 6
4
OUTPUT TO ADC
WITH ANTIALIASING
FILTER
ADC OUT
FILT+V
S
–IN
+IN
R1
4kΩ
R2
R3
5kΩ
OUT
07451-001
AD8293Gxx
REFGND
32
IN-AMP
Figure 1.
1
8
7 5
6
4
ADC OUT
FILT+V
S
I
1.8V
–IN
+IN
R1
4kΩ
R
SHUNT
R3
5kΩ
+3.3V
10µF0.1µF
C3
OUT
C2
07451-002
REFGND
32
IN-AMP
ADC
REF
LOAD
DC-DC
+5
V
0.1µF
R2
AD8293Gxx
Figure 2. Measuring Current Using the AD8293G80/AD8293G160
Table 1. AD8293Gxx Models and Gains
Model Gain
AD8293G80 80
AD8293G160 160
GENERAL DESCRIPTION
The AD8293G80/AD8293G160 are small, low cost, precision
instrumentation amplifiers that have low noise and rail-to-rail
outputs. They are available in two fixed-gain models: 80 and 160.
They incorporate the gain setting resistors and filter resistors,
reducing the number of ancillary components. For example,
only two external capacitors are needed to implement a 2-pole
filter. The AD8293G80/AD8293G160 also feature low offset
voltage, offset drift, and gain drift coupled with high common-
mode rejection. They are capable of operating on a supply of
1.8 V to 5.5 V.
With a low offset voltage of 20 µV (AD8293G160B), an offset
voltage drift of 0.3 µV/°C, and a voltage noise of only 0.7 µV p-p
(0.01 Hz to 10 Hz), the AD8293G80/AD8293G160 are ideal
for applications where error sources cannot be tolerated.
Precision instrumentation, position and pressure sensors,
medical instrumentation, and strain gauge amplifiers benefit
from the low noise, low input bias current, and high common-
mode rejection. The small footprint and low cost are ideal for
high volume applications.
The small package and low power consumption allow the maxi-
mum channel density and the minimum board size required for
portable systems. Designed for ease of use, these instrumentation
amplifiers, unlike more traditional ones, have a buffered reference,
eliminating the need for an additional op amp to set the reference
voltage to midsupply.
The AD8293G80/AD8293G160 are specified over the industrial
temperature range from −40°C to +85°C. The AD8293G80/
AD8293G160 are available in a halogen-free, Pb-free, 8-lead SOT-23.
AD8293G80/AD8293G160
Rev. 0 | Page 2 of 16
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Electrical Characteristics ............................................................. 3
Absolute Maximum Ratings ............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution .................................................................................. 5
Pin Configuration and Function Descriptions ............................. 6
Typical Performance Characteristics ............................................. 7
Theory of Operation ...................................................................... 10
High PSR and CMR ................................................................... 10
1/f Noise Correction .................................................................. 10
Applications Information .............................................................. 11
Overview ..................................................................................... 11
Reference Connection ............................................................... 11
Output Filtering .......................................................................... 11
Clock Feedthrough ..................................................................... 12
Power Supply Bypassing ............................................................ 12
Input Overvoltage Protection ................................................... 12
Outline Dimensions ....................................................................... 13
Ordering Guide .......................................................................... 13
REVISION HISTORY
8/08—Revision 0: Initial Version
AD8293G80/AD8293G160
Rev. 0 | Page 3 of 16
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
V
CC
= 5.0 V, V
CM
= −0 V, V
REF
= 3.3 V, V
IN
= V
INP
− V
INN
, T
A
= 25°C, tested at ADC OUT, unless otherwise noted. Temperature
specifications guaranteed by characterization.
Table 2. A Grade
AD8293G80A AD8293G160A
Parameter Symbol Conditions Min Typ Max Min Typ Max Unit
COMMON-MODE REJECTION CMR
V
CM
= 0 V to 3.3 V,
−40°C ≤ T
A
≤ +85°C
94 140 94 140 dB
NOISE PERFORMANCE
Voltage Noise e
n p-p
f = 0.01 Hz to 10 Hz 0.7 0.7 μV p-p
Voltage Noise Density e
n
f = 1 kHz 35 35 nV/√Hz
INPUT CHARACTERISTICS
Input Offset Voltage V
OS
9 50 9 50 μV
vs. Temperature ΔV
OS
/ΔT −40°C ≤ T
A
≤ +85°C 0.02 0.3 0.02 0.3 μV/°C
Input Bias Current I
B
−40°C ≤ T
A
≤ +85°C 0.4 2 0.4 2 nA
Input Offset Current I
OS
4 4 nA
Input Operating Impedance
Differential 50||1 50||1 MΩ||pF
Common Mode 10||10 10||10 GΩ||pF
Input Voltage Range 0 V
CC
− 1.7 0 V
CC
− 1.7 V
DYNAMIC RESPONSE
Small Signal Bandwidth
1
BW Filter limited 500 500 Hz
Slew Rate SR Filter limited Filter limited
Settling Time
2
t
s
0.1% 500 Hz filter, V
O
= 2 V step 1.9 1.9 ms
0.01% 2.4 2.4 ms
Internal Clock Frequency 60 60 kHz
GAIN 80 160
Gain Error V
O
= 0.075 V to 4.925 V 0.3 1 0.3 1 %
Gain Drift −40°C ≤ T
A
≤ +85°C 5 25 5 25 ppm/°C
Nonlinearity V
O
= 0.075 V to 4.925 V 0.003 0.03 0.003 0.03 % FS
OUTPUT CHARACTERISTICS
Output Voltage High V
OH
V
CC
−
0.075
V
CC
−
0.075
V
Output Voltage Low V
OL
0.075 0.075 V
Short-Circuit Current I
SC
±35 ±35 mA
REFERENCE CHARACTERISTICS
V
REF
Range 0.8 V
CC
− 0.8 0.8 V
CC
− 0.8 V
REF Pin Current I
REF
0.01 1 0.01 1 nA
POWER SUPPLY
Operating Range 1.8 5.5 1.8 5.5 V
Power Supply Rejection PSR V
CC
= 1.8 V to 5.5 V, V
CM
= 0 V 94 120 94 120 dB
Supply Current I
SY
I
O
= 0 mA, V
IN
= 0 V 1.0 1.3 1.0 1.3 mA
−40°C ≤ T
A
≤ +85°C 1.5 1.5 mA
TEMPERATURE RANGE
Specified Range −40 +85 −40 +85 °C
1
Higher bandwidths result in higher noise.
2
Settling time is determined by filter setting.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

AD8293G160BRJZ-RL

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Manufacturer:
Analog Devices Inc.
Description:
Instrumentation Amplifiers Zero-Drift w/ Filter & Fixed Gain
Lifecycle:
New from this manufacturer.
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