AD8420 Series

Wide Supply Range, Micropower, Rail-to-Rail Instrumentation Amplifier

Catalog

Wide Supply Range, Micropower, Rail-to-Rail Instrumentation Amplifier

Part	Output Type	-3db Bandwidth	Supplier Device Package	Voltage - Supply Span (Max) [Max]	Amplifier Type	Mounting Type	Slew Rate	Package / Case	Package / Case [custom]	Package / Case	Current - Input Bias	Operating Temperature [Max]	Operating Temperature [Min]	Current - Output / Channel [custom]	Number of Circuits	Voltage - Input Offset	Voltage - Supply Span (Min) [Min]	Current - Supply
Analog Devices AD8420ARMZ	Rail-to-Rail	250 kHz	8-MSOP	36 V	Instrumentation	Surface Mount	1 V/µs	8-MSOP 8-TSSOP	0.118 in	3 mm	20 nA	85 °C	-40 °C	10 mA	1	250 çV	2.7 V	85 µA
Analog Devices AD8420ARMZ-R7	Rail-to-Rail	250 kHz	8-MSOP	36 V	Instrumentation	Surface Mount	1 V/µs	8-MSOP 8-TSSOP	0.118 in	3 mm	20 nA	85 °C	-40 °C	10 mA	1	250 çV	2.7 V	85 µA

Catalog

Wide Supply Range, Micropower, Rail-to-Rail Instrumentation Amplifier

Key Features

• Maximum supply current:90 μA

• Minimum CMRR: 100 dB

• Drives heavy capacitive loads:~700 pF

• Rail-to-rail output

• Input voltage range goes below ground

• Gain set with 2 external resistorsCan achieve low gain drift at any gain

• Very wide power supply rangeSingle supply: 2.7 V to 36 VDual supply: ±2.7 V to ±18 V

• Bandwidth (G = 100): 2.5 kHz

• Input voltage noise: 55 nV/√Hz

• See data sheet for additional features

Description

The AD8420 is a low cost, micropower, wide supply range, instrumentation amplifier with a rail-to-rail output and a novel architecture that allows for extremely flexible design. It is optimized to amplify small differential voltages in the presence of large common-mode signals.The AD8420 is based on an indirect current feedback architecture that gives it an excellent input common-mode range. Unlike conventional instrumentation amplifiers, the AD8420 can easily amplify signals at or even slightly below ground without requiring dual supplies. The AD8420 has rail-to-rail output, and the output voltage swing is completely independent of the input common-mode voltage.Single-supply operation, micropower current consumption, and rail-to-rail output swing make the AD8420 ideal for battery-powered applications. Its rail-to-rail output stage maximizes dynamic range when operating from low supply voltages. Dual-supply operation (±15 V) and low power consumption make the AD8420 ideal for a wide variety of applications in medical or industrial instrumentation.The AD8420 is available in an 8-lead MSOP package. Performance is specified over the full temperature range of −40°C to +85°C, and the part is operational from −40°C to +125°CAPPLICATIONSBridge amplifiersPressure MeasurementMedical instrumentationPortable data acquisitionMultichannel systems