Datasheet AD623 (Analog Devices)

Single and Dual-Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier Data Sheet AD623 FEATURES GENERAL DESCRIPTION Easy to use
The AD623 is an integrated, single- or dual-supply instrumentation
Rail-to-rail output swing
amplifier that delivers rail-to-rail output swing using supply
Input voltage range extends 150 mV below ground
voltages from 3 V to 12 V. The AD623 offers superior user
(single supply)
flexibility by allowing single gain set resistor programming and by
Low power, 550 µA maximum supply current
conforming to the 8-lead industry standard pinout configuration.
Gain set with one external resistor
With no external resistor, the AD623 is configured for unity
Gain range: 1 to 1000
gain (G = 1), and with an external resistor, the AD623 can be
High accuracy dc performance
programmed for gains of up to 1000.
0.10% gain accuracy (G = 1)
The superior accuracy of the AD623 is the result of increasing
0.35% gain accuracy (G > 1)
ac common-mode rejection ratio (CMRR) coincident with
Noise: 35 nV/√Hz RTI noise at 1 kHz
increasing gain; line noise harmonics are rejected due to
Excellent dynamic specifications
constant CMRR up to 200 Hz. The AD623 has a wide input
800 kHz bandwidth (G = 1)
common-mode range and amplifies signals with common-
20 µs settling time to 0.01% (G = 10)
mode voltages as low as 150 mV below ground. The AD623
APPLICATIONS
maintains superior performance with dual and single polarity
Low power medical instrumentation
power supplies.
Transducer interfaces Table 1. Low Power Upgrades for the AD623 Thermocouple amplifiers Part No. Total V Industrial process controls S (V dc) Typical IQ (µA)
AD8235 5.5 30
Difference amplifiers
AD8236 5.5 33
Low power data acquisition
AD8237 5.5 33 AD8226 36 350 AD8227 36 325 AD8420 36 85 AD8422 36 300 AD8426 36 325 (per channel)
FUNCTIONAL BLOCK DIAGRAM +VS 2 7 –IN 50kΩ 50kΩ A1 – VDIFF 2 + –RG 50kΩ 6 VCM 1 A3 OUTPUT – R V G DIFF 8 50kΩ 2 + +RG +IN 50kΩ 50kΩ 5 3 4 A2 REF
054
–VS
00778- Figure 1.
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Document Outline Features Applications General Description Functional Block Diagram Revision History Specifications Single Supply Dual Supplies Specifications Common to Dual and Single Supplies Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Applications Information Basic Connection Gain Selection Reference Terminal Input and Output Offset Voltage Error Input Protection RF Interference Grounding Ground Returns for Input Bias Currents Output Buffering Single-Supply Data Acquisition System Amplifying Signals with Low Common-Mode Voltage Input Differential and Common-Mode Range vs. Supply and Gain Additional Information Evaluation Board General Description Outline Dimensions Ordering Guide