AD8221AR-REEL7

Voltage - Input Offset:	60µV
Base Part Number:	AD8221
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Voltage - Supply, Single/Dual (±):	4.6 V ~ 36 V, ±2.3 V ~ 18 V
Current - Output / Channel:	18mA
Current - Supply:	900µA
Series:	--
Current - Input Bias:	500pA
-3db Bandwidth:	825kHz
Slew Rate:	2 V/µs
Output Type:	--
Number of Circuits:	1
Amplifier Type:	Instrumentation
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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AD8221AR-REEL7 is a precision instrumentation amplifier, a device in the category of linear amplifiers. An instrumentation amplifier is an integrated circuit, typically composed of three op-amps and resistor networks. It amplifies small signals in the presence of large common-mode signals. Instrumentation amplifiers allow for large gains and outputs of a much larger magnitude than op-amps, buffer amps, or differential amplifiers.The AD8221AR-REEL7 from Analog Devices is an instrumentation amplifier offering low distortion, low noise, and wide bandwidth, making it suitable for use in precision polar accuracy instruments. It operates on both ±5V and ±15V supplies and features wide bandwidth, low-drift, matched resistors, and low current drain.The AD8221AR-REEL7 features a wide power supply range (±1.25 V to ±50 V) and rail-to-rail output. It also features a low offset voltage (maximum of 200 µV) and a low offset drift, below 0.2µV/°C. The device has low-noise, making it suitable for high-accuracy measurements, and excellent CMRR, making it suitable for medical and instrumentation applications. The AD8221AR-REEL7 supports high accuracy current measurements over a wide frequency range, up to 1MHz.The AD8221AR-REEL7 amplifier is composed of three amplifier stages plus the Resistor Network. The first two stages are configured as an instrumentation amplifier. The first two amplifier stages consist of a differential input stage and a gain stage. The first two stages provide programmable gain and input impedance. The gain setting of the amplifier is adjusted by setting the voltage across a resistor network. The gain of the amplifier is set by the ratio of the resistance of the input resistor network to the output resistor network. Both the input and output networks can be adjusted independently. The second stage is the output stage. It provides current to drive the output. The output stage comprises of a MOSFET cascode amplifier and a current source. The MOSFET amplifier is used to provide low output impedance, while the current sourcedriver ensures high precision accurate current source.The AD8221AR-REEL7 also features built-in Electrostatic Discharge (ESD) and Over-Voltage Protection circuitry. This protects the amplifier from the harmful effects of electric fields (ESD) and over-voltage conditions. The AD8221AR-REEL7 can be used in a variety of medical, instrumentation and sensing applications due to its combination of low noise, low distortion and wide bandwidth capabilities. Examples of such applications include pH meters, thermal imaging systems, current measurement applications, photoacoustic imaging systems, and ultrasonic imaging systems.In summary, the AD8221AR-REEL7 is a three-amplifier precision instrumentation amplifier. It features rail-to-rail output, low offset voltage and drift, low noise, and wide-bandwidth. It is suitable for medical, instrumentation and sensing applications due to its combination of low noise, low distortion and wide bandwidth capabilities.

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