Datasheet AD8421-EP (Analog Devices)

3 nV/√Hz, Low Power Instrumentation Amplifier Enhanced Product AD8421-EP FEATURES PIN CONNECTION DIAGRAM Specified from −55°C to 125°C AD8421-EP –IN 1 8 +V 0.9 μV/°C maximum input offset voltage drift S 5 ppm/°C maximum gain drift (G = 1) RG 2 7 VOUT Low power RG 3 6 REF 2.3 mA maximum supply current +IN 4 5 –VS
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Low noise
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TOP VIEW
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(Not to Scale)
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3.2 nV/√Hz maximum input voltage noise at 1 kHz
1 Figure 1.
200 fA/√Hz current noise at 1 kHz Excellent ac specifications 10µ G = 100 2 MHz bandwidth (G = 100) ) 0.6 μs settling time to 0.001% (G = 10) /√Hz BEST AVAILABLE V ( 7mA LOW NOISE IN-AMP 80 dB minimum CMRR at 20 kHz (G = 1) 1µ High precision dc performance 1kHz T 84 dB CMRR minimum (G = 1) A Y IT 2 nA maximum input bias current 100n NS Inputs protected to 40 V from opposite supply DE E Gain set with a single resistor (G = 1 to 10,000) IS BEST AVAILABLE 1mA LOW POWER IN-AMP NO 10n L ENHANCED PRODUCT FEATURES A T AD8421 O T Supports defense and aerospace applications (AQEC standard) RS NOISE ONLY Military temperature range (−55°C to +125°C) 1n100 1k 10k 100k 1M
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Controlled manufacturing baseline
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SOURCE RESISTANCE, RS (Ω)
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One assembly/test site
Figure 2. Noise Density vs. Source Resistance
One fabrication site Enhanced product change notification Qualification data available on request
The AD8421-EP delivers 3 nV/√Hz input voltage noise and
GENERAL DESCRIPTION
200 fA/√Hz current noise with only 2 mA quiescent current, The AD8421-EP is a low cost, low power, extremely low noise, making it an ideal choice for measuring low level signals. For ultralow bias current, high speed instrumentation amplifier that applications with high source impedance, the AD8421-EP employs is ideally suited for a broad spectrum of signal conditioning and innovative process technology and design techniques to provide data acquisition applications. This product features extremely noise performance that is limited only by the sensor. high CMRR, allowing it to extract low level signals in the presence The AD8421-EP uses unique protection methods to ensure robust of high frequency common-mode noise over a wide inputs while still maintaining very low noise. This protection temperature range. allows input voltages up to 40 V from the opposite supply rail The 10 MHz bandwidth, 35 V/μs slew rate, and 0.6 μs settling without damage to the part. time to 0.001% (G = 10) allow the AD8421-EP to amplify high A single resistor sets the gain from 1 to 10,000. The reference speed signals and excel in applications that require high channel pin can be used to apply a precise offset to the output voltage. count, multiplexed systems. Even at higher gains, the current The AD8421-EP is specified over the military temperature range of feedback architecture maintains high performance; for example, −55°C to +125°C. It is available in an 8-lead MSOP package. at G = 100, the bandwidth is 2 MHz and the settling time is 0.8 μs. The AD8421-EP has excellent distortion performance, Additional application and technical information can be found making it suitable for use in demanding applications such as in the AD8421 data sheet. vibration analysis.
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Document Outline Features Enhanced Product Features Pin Connection Diagram General Description Revision History Specifications Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Outline Dimensions Ordering Guide