AD8420ARMZ-R7
宽电源电压范围，微功耗， Wide Supply Range, Micropower,
Product Details
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°C
**APPLICATIONS**
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- Bridge amplifiers
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- Pressure Measurement
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- Medical instrumentation
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- Portable data acquisition
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- Multichannel systems
### Features and Benefits
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- Maximum supply current:
90 μA
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- Minimum CMRR: 100 dB
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- Drives heavy capacitive loads:
~700 pF
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- Rail-to-rail output
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- Input voltage range goes below ground
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- Gain set with 2 external resistors
Can achieve low gain drift at any gain
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- Very wide power supply range
Single supply: 2.7 V to 36 V
Dual supply: ±2.7 V to ±18 V
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- Bandwidth G = 100: 2.5 kHz
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- Input voltage noise: 55 nV/√Hz
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- See data sheet for additional features
