AD8251
10 MHz, G = 1, 2, 4, 8 iCMOS® Programmable Gain Instrumentation Amplifier
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Overview
Features and Benefits
- Small package: 10-lead MSOP
- Programmable gains: 1, 2, 4, 8
- Digital or pin-programmable gain setting
- Wide supply: ±5 V to ±15 V
- Excellent dc performance
High CMRR: 98 dB (minimum), G = 8
Low gain drift: 10 ppm/°C (maximum)
Low offset drift: 1.8 μV/°C (maximum), G = 8
EXCELLENT AC PERFORMANCE
- Fast settling time: 785 ns to 0.001% (maximum)
- High slew rate: 20 V/μs (minimum)
- Low distortion: −110 dB THD at 1 kHz,10 V swing
- High CMRR over frequency: 80 dB to 50 kHz (minimum)
- Low noise: 18 nV/√Hz, G = 10 (maximum)
- Low power: 4 mA
Product Details
The AD8251 is an instrumentation amplifier with digitally programmable gains that has GΩ input impedance, low output noise, and low distortion, making it suitable for interfacing with sensors and driving high sample rate analog-to-digital converters (ADCs). It has high bandwidth of 10 MHz, low THD of −110 dB, and fast settling time of 785 ns (maximum) to 0.001%. Offset drift and gain drift are guaranteed to 1.8 μV/°C and 10 ppm/°C, respectively, for G = 8. In addition to its wide input common voltage range, it boasts a high common-mode rejection of 80 dB at G = 1 from dc to 50 kHz. The combination of precision dc performance coupled with high speed capabilities makes the AD8251 an excellent candidate for data acquisition. Furthermore, this monolithic solution simplifies design and manufacturing and boosts performance of instrumentation by maintaining a tight match of internal resistors and amplifiers.The AD8251 user interface consists of a parallel port that allows users to set the gain in one of two different ways (see Figure 1 in data sheet for the functional block diagram). A 2-bit word sent via a bus can be latched using the WR input. An alternative is to use transparent gain mode where the state of logic levels at the gain port determines the gain.
The AD8251 is available in a 10-lead MSOP package and is specified over the −40°C to +85°C temperature range, making it an excellent solution for applications where size and packing density are important considerations.
Applications
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
Documentation & Resources
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CN0393: Bank Isolated, 2-Channel, 16-Bit, 500 kSPS, Simultaneous Sampling Signal Chain Featuring Integrated Data Acquisition Subsystem (Rev. A)5/12/2017
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CN-0385: Isolated, Multichannel Data Acquisition System with PGIA for Single-Ended and Differential Industrial Level Signals (Rev. 0)10/10/2016
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CN0345: Low Power, Multichannel Data Acquisition System with PGIA for Single-Ended and Differential Industrial-Level Signals (Rev. 0)4/4/2016
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FPGA-Based Systems Increase Motor-Control Performance3/1/2015 Analog Dialogue
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Complete Sensor-to-Bits Solution Simplifies Industrial Data-Acquisition System Design4/1/2013 Analog Dialogue
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Ultrahigh-Performance Differential-Output Programmable-Gain Instrumentation Amplifier for Data Acquisition10/1/2011 Analog Dialogue
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Auto-Zero Amplifiers3/1/2010
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High-performance Adder Uses Instrumentation Amplifiers9/3/2009
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8-channel data-acquisition system uses single ADC driver12/1/2008 Analog Dialogue
Tools & Simulations
In-Amp Diamond Plot Tool
The Diamond Plot Tool is a web application that generates a configuration-specific Output Voltage Range vs. Input Common-Mode Voltage graph, also known as the Diamond Plot, for Analog Devices Instrumentation Amplifiers. Based on user inputs such as supply voltage, gain, and input signal range, the tool detects saturation and recommends in-amps for which the input signal is in-range and the configuration is valid. Avoid saturation, find the best in-amp for your design, and save time.
SPICE Models
CIR
AD8251 SPICE Macro Model
12.15 K
Reference Designs (3)
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| AD8251ARMZ | Material Declaration | Reliability Data | 10-Lead MSOP | |
| AD8251ARMZ-R7 | Material Declaration | Reliability Data | 10-Lead MSOP | |
| AD8251ARMZ-RL | Material Declaration | Reliability Data | 10-Lead MSOP | |
| Wafer Fabrication Data |
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Sample & Buy
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Lead Times
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Sampling
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Evaluation Boards
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.