Datasheet AD8421 (Analog Devices) - 7

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Data Sheet AD8421 ARM Grade BRM Grade Test Conditions/ Parameter Comments Min Typ Max Min Typ Max Unit
OUTPUT RL = 2 kΩ Output Swing VS = ±2.5 V to ±18 V −VS + 1.2 +VS − 1.6 −VS + 1.2 +Vs − 1.6 V Over Temperature TA = −40°C to +85°C −VS + 1.2 +VS − 1.6 −VS + 1.2 +Vs − 1.6 V Short-Circuit Current 65 65 mA REFERENCE INPUT RIN 20 20 kΩ IIN VIN+, VIN− = 0 V 20 24 20 24 μA Voltage Range −VS +VS −VS +VS V Reference Gain to Output 1 ± 1 ± V/V 0.0001 0.0001 POWER SUPPLY Operating Range Dual supply ±2.5 ±18 ±2.5 ±18 V Single supply 5 36 5 36 V Quiescent Current 2 2.3 2 2.3 mA Over Temperature TA = −40°C to +85°C 2.6 2.6 mA TEMPERATURE RANGE For Specified Performance −40 +85 −40 +85 °C Operational5 −40 +125 −40 +125 °C 1 Total voltage noise = √(e 2 2 ni + (eno/G)2 + eRG ). See the Theory of Operati s on ection for more information. 2 Total RTI VOS = (VOSI) + (VOSO/G). 3 These specifications do not include the tolerance of the external gain setting resistor, RG. For G > 1, add RG errors to the specifications given in this table. 4 Input voltage range of the AD8421 input stage only. The input range can depend on the common-mode voltage, differential voltage, gain, and reference voltage. See the Input Voltage Range section for more information. 5 See the Typical Performance Characteristics section for expected operation between 85°C and 125°C. Rev. 0 | Page 7 of 28 Document Outline FEATURES APPLICATIONS PIN CONNECTION DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS AR AND BR GRADES ARM AND BRM GRADES ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION ARCHITECTURE GAIN SELECTION RG Power Dissipation REFERENCE TERMINAL INPUT VOLTAGE RANGE LAYOUT Common-Mode Rejection Ratio over Frequency Power Supplies and Grounding Reference Pin INPUT BIAS CURRENT RETURN PATH INPUT VOLTAGES BEYOND THE SUPPLY RAILS Input Voltages Beyond the Maximum Ratings RADIO FREQUENCY INTERFERENCE (RFI) CALCULATING THE NOISE OF THE INPUT STAGE Source Resistance Noise Voltage Noise of the Instrumentation Amplifier Current Noise of the Instrumentation Amplifier Total Noise Density Calculation APPLICATIONS INFORMATION DIFFERENTIAL OUTPUT CONFIGURATION DRIVING AN ADC OUTLINE DIMENSIONS ORDERING GUIDE