Datasheet AD8236 (Analog Devices)

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40 μA Micropower Instrumentation Amplifier with Zero Crossover Distortion AD8236 FEATURES CONNECTION DIAGRAM Low power: 40 μA supply current (maximum) –IN 1 8 +VS Low input currents RG 2 7 VOUT 1 pA input bias current RG 3 6 REF +IN 4 5 –V 0.5 pA input offset current S High CMRR: 110 dB CMRR, G = 100 AD8236
01 0
TOP VIEW
0-
Space-saving MSOP (Not to Scale)
00 08
Zero input crossover distortion
Figure 1.
Rail-to-rail input and output Gain set with single resistor Operates from 1.8 V to 5.5 V 5.0 4.5 ) (V E 4.0 G = 5 APPLICATIONS G V A S = 5V T 3.5 V L REF = 2.5V Medical instrumentation 3.0 Low-side current sense E VO D O Portable devices 2.5 -M N O 2.0 MM O 1.5 C T G = 5 1.0 V PU S = 1.8V V IN REF = 0.9V 0.5
02 0 0- 00
0
08
–0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 OUTPUT VOLTAGE (V)
Figure 2. Wide Common-Mode Voltage Range vs. Output Voltage
GENERAL DESCRIPTION
The AD8236 is the lowest power instrumentation amplifier
Table 1. Instrumentation Amplifiers by Category1
in the industry. It has rail-to-rail outputs and can operate on
General Military Low High Speed
voltages as low as 1.8 V. Its 40 μA maximum supply current
Purpose Zero Drift Grade Power PGA
makes it an excellent choice in battery-powered applications. AD8220 AD8230 AD620 AD8236 AD8250 The AD8236’s high input impedance, low input bias current of AD8221 AD8231 AD621 AD627 AD8251 1 pA, high CMRR of 110 dB (G = 100), small size, and low power AD8222 AD8290 AD624 AD623 AD8253 offer tremendous value. It has a wider common-mode voltage AD8228 AD8293G80 AD524 AD8223 range than typical three-op-amp instrumentation amplifiers, AD8295 AD8293G160 AD526 AD8226 making this a great solution for applications that operate on a AD8553 single 1.8 V or 3 V supply. An innovative input stage allows for AD8556 a wide rail-to-rail input voltage range without the crossover AD8557 distortion common in other designs. 1 See www.analog.com/inamps for the latest instrumentation amplifiers. The AD8236 is available in an 8-lead MSOP and is specified over the industrial temperature range of −40°C to +125°C.
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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. 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. Tel: 781.329.4700 www.analog.com Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 ©2009 Analog Devices, Inc. All rights reserved.
Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION CONNECTION DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS MAXIMUM POWER DISSIPATION ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION BASIC OPERATION GAIN SELECTION LAYOUT Grounding REFERENCE TERMINAL POWER SUPPLY REGULATION AND BYPASSING INPUT BIAS CURRENT RETURN PATH INPUT PROTECTION RF INTERFERENCE COMMON-MODE INPUT VOLTAGE RANGE APPLICATIONS INFORMATION AC-COUPLED INSTRUMENTATION AMPLIFIER LOW POWER HEART RATE MONITOR OUTLINE DIMENSIONS ORDERING GUIDE