Features and Benefits
- Low power
- 40 μA maximum supply current
- 6 nA shutdown current
- Low input currents
- 50 pA input bias current
- 25 pA input offset current
- High Common Mode Rejection Ratio (CMRR)
- 110 dB CMRR , G = 100
- Space saving
- WLCSP package
- Zero input crossover distortion
- Rail-to-rail input and output
- Gain set with single resistor (G = 5 to 200)
- AD8236: μSOIC package version of AD8235
The AD8235 is the smallest and lowest power instrumentation amplifier in the industry. It is available in a 1.5 mm × 2.2 mm wafer level chip scale package (WLCSP). The AD8235 draws a maximum quiescent current of 40 μA. In addition, it draws a maximum 500 nA of current during shutdown mode, making it an excellent instrumentation amplifier for battery powered, portable applications.
The AD8235 can operate on supply voltages as low as 1.8 V. The input stage allows for wide rail-to-rail input voltage range without the crossover distortion, common in other designs. The rail-torail output enables easy interfacing to ADCs.
The AD8235 is an excellent choice for signal conditioning. Its low input bias current of 50 pA and high CMRR of 110 dB (G = 100) offer tremendous value for its size and low power. It is specified over the extended industrial temperature range of −40°C to 125°C.
- Medical instrumentation
- Low-side current sense
- Portable electronics
Markets and Technologies
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 (1)
The AD8235ACBZ-EVALZ contains a CR2032 battery provision that is capable of powering up the AD8235 40 μA, micropower instrumentation amplifier and the LTC2063 low power operational amplifier. This feature allows the AD8235ACBZ-EVALZ to be a standalone board ready for product evaluation.
The AD8235ACBZ-EVALZ design allows the user to easily adjust the gain resistors and common discrete components on the board. The on-board male headers set the AD8235ACBZ-EVALZ to different configurations using the jumper shunt.
The AD8235ACBZ-EVALZ allows battery-powered configuration to showcase the portable nature of the AD8235. In battery-powered configuration, the LTC2063 acts as the voltage reference for the single-supply configuration.
For full details on the AD8235, see the AD8235 data sheet, which must be consulted in conjunction with this user guide when using the AD8235ACBZ-EVALZ.
- Fast and easy product evaluation and characterization
- Portable system applications
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
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.
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.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.