Datasheet AD8293G80, AD8293G160 (Analog Devices)

Low Cost, Zero-Drift In-Amp with Filter and Fixed Gain AD8293G80/AD8293G160 FEATURES FUNCTIONAL BLOCK DIAGRAM Small package: 8-lead SOT-23 Reduced component count 7 5 6 +V FILT S OUT Incorporates gain resistors and filter resistors Low offset voltage: 20 μV maximum R2 +IN Low offset drift: 0.3 μV/°C maximum 8 R3 5kΩ Low gain drift: 25 ppm/°C maximum R1 IN-AMP 4 4kΩ ADC OUT OUTPUT TO ADC High CMR: 140 dB typical –IN WITH ANTIALIASING 1 FILTER Low noise: 0.7 μV p-p from 0.01 Hz to 10 Hz
1
Single-supply operation: 1.8 V to 5.5 V
-00
GND REF AD8293Gxx
1 45
2 3 Rail-to-rail output
07
Available in 2 fixed-gain models
Figure 1.
+5V APPLICATIONS 0.1µF C2 Current sensing 7 5 6 Strain gauges +V FILT S OUT Laser diode control loops LOAD R2 +IN 8 Portable medical instruments R3 R1 5kΩ I R IN-AMP 4 ADC Thermocouple amplifiers SHUNT 4kΩ ADC OUT –IN C3 REF 1 +3.3V 1.8V DC-DC GND REF AD8293Gxx 0.1µF 10µF
002
2 3
1- 745 0 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 Precision instrumentation, position and pressure sensors, instrumentation amplifiers that have low noise and rail-to-rail medical instrumentation, and strain gauge amplifiers benefit outputs. They are available in two fixed-gain models: 80 and 160. from the low noise, low input bias current, and high common- They incorporate the gain setting resistors and filter resistors, mode rejection. The small footprint and low cost are ideal for reducing the number of ancillary components. For example, high volume applications. only two external capacitors are needed to implement a 2-pole The small package and low power consumption allow the maxi- filter. The AD8293G80/AD8293G160 also feature low offset mum channel density and the minimum board size required for voltage, offset drift, and gain drift coupled with high common- portable systems. Designed for ease of use, these instrumentation mode rejection. They are capable of operating on a supply of amplifiers, unlike more traditional ones, have a buffered reference, 1.8 V to 5.5 V. eliminating the need for an additional op amp to set the reference With a low offset voltage of 20 μV (AD8293G160B), an offset voltage to midsupply. voltage drift of 0.3 μV/°C, and a voltage noise of only 0.7 μV p-p The AD8293G80/AD8293G160 are specified over the industrial (0.01 Hz to 10 Hz), the AD8293G80/AD8293G160 are ideal temperature range from −40°C to +85°C. The AD8293G80/ for applications where error sources cannot be tolerated. AD8293G160 are available in a halogen-free, Pb-free, 8-lead SOT-23.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ELECTRICAL CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION HIGH PSR AND CMR 1/f NOISE CORRECTION APPLICATIONS INFORMATION OVERVIEW REFERENCE CONNECTION OUTPUT FILTERING CLOCK FEEDTHROUGH POWER SUPPLY BYPASSING INPUT OVERVOLTAGE PROTECTION OUTLINE DIMENSIONS ORDERING GUIDE