The **AD8236ARMZ-R7** is a high-precision, low-power instrumentation amplifier manufactured by Analog Devices. It is specifically designed for battery-powered medical and industrial applications where power consumption and space are critical. --- ### 1. Key Technical Specifications Below is a summary of the core electrical characteristics of the AD8236: | Parameter | Specification | | :--- | :--- | | **Architecture** | 3-Op Amp Instrumentation Amplifier | | **Supply Voltage** | 1.8V to 5.5V (Single Supply) | | **Quiescent Current** | 40 μA (Maximum) | | **Bandwidth** | 23 kHz (at G=1) | | **CMRR** | 110 dB (at G=100) | | **Input Offset Voltage** | 100 μV (Maximum) | | **Package Type** | 8-Lead MSOP (ARMZ) | --- ### 2. Functional Features #### A. Power Efficiency The AD8236 is one of the industry's lowest-power instrumentation amplifiers. Consuming only **40 μA**, it is ideal for wearable devices (like heart rate monitors) that must operate for long periods on a single coin-cell battery. #### B. Rail-to-Rail Output The output can swing almost to the supply rails, allowing for a wide dynamic range even when operating on a low 1.8V supply. This is essential for interfacing with modern low-voltage Analog-to-Digital Converters (ADCs). #### C. Gain Adjustment The gain ($G$) is set by a single external resistor ($R_G$). The formula for calculating the gain is: `G = 1 + (420 kΩ / Rg)` *If no resistor is used, the device defaults to a gain of 1.* --- ### 3. Pin Configuration (8-Lead MSOP) Understanding the pinout is crucial for PCB design: | Pin No. | Name | Function | | :--- | :--- | :--- | | 1 | -IN | Inverting Input | | 2 | RG | Gain Resistor Terminal | | 3 | RG | Gain Resistor Terminal | | 4 | +IN | Non-inverting Input | | 5 | -Vs | Negative Supply (or Ground) | | 6 | REF | Reference Voltage (shifts output level) | | 7 | Vout | Output Signal | | 8 | +Vs | Positive Supply | --- ### 4. Common Applications * **Medical Instrumentation:** ECG/EKG monitors, EEG, and portable patient monitoring. * **Industrial Sensors:** Pressure sensors, strain gauges, and RTD temperature sensing. * **Portable Consumer Tech:** Precision weight scales and wearable fitness trackers. * **Bridge Amplifiers:** Converting small differential signals from bridge sensors into measurable voltages. --- ### 5. Ordering Information Meaning The part number **AD8236ARMZ-R7** breaks down as follows: * **AD8236:** Model number. * **A:** Performance grade. * **RM:** Package code (MSOP). * **Z:** RoHS compliant (Lead-free). * **R7:** 7-inch reel (packaging format for automated assembly).