## Overview of AD627BRZ-R7 The **AD627BRZ-R7** is a high-precision, low-power instrumentation amplifier manufactured by **Analog Devices**. It is designed to provide rail-to-rail output swing and operate on either single or dual power supplies. It is widely used in battery-powered applications due to its extremely low quiescent current. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Architecture** | Micropower Instrumentation Amplifier | | **Supply Voltage (Single)** | +2.2 V to +36 V | | **Supply Voltage (Dual)** | ±1.1 V to ±18 V | | **Quiescent Current** | 85 μA (max) | | **Gain Range** | 5 to 1,000 (Set by one external resistor) | | **Bandwidth** | 80 kHz (G=5) / 25 kHz (G=100) | | **Package** | 8-Lead SOIC_N (Small Outline Integrated Circuit) | | **Input Bias Current** | 10 nA (max) | --- ### 2. Core Functional Features * **Single Resistor Gain Set:** The gain is programmed using a single external resistor ($R_G$). The formula for calculating gain is: `Gain = 5 + (200 kΩ / Rg)` * **Rail-to-Rail Output:** The output voltage can swing very close to the supply rails, maximizing the dynamic range, especially in low-voltage 3V or 5V systems. * **Micropower Operation:** Consuming only 85 μA, it is ideal for portable medical devices and remote sensors. * **Wide Input Range:** The input common-mode range includes the negative rail (ground in single-supply mode), allowing it to sense signals near 0V. --- ### 3. Pin Configuration | Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | -RG | Gain resistor terminal | | 2 | -IN | Inverting Input | | 3 | +IN | Non-inverting Input | | 4 | -Vs | Negative Supply / Ground | | 5 | REF | Reference voltage (sets output offset) | | 6 | OUTPUT | Amplifier output signal | | 7 | +Vs | Positive Supply | | 8 | +RG | Gain resistor terminal | --- ### 4. Typical Applications 1. **Medical Instrumentation:** ECG/EKG monitors and portable blood pressure monitors. 2. **Industrial Process Control:** Current shunt sensing and 4-20 mA loop-powered transmitters. 3. **Precision Data Acquisition:** Interfacing low-voltage bridge sensors (strain gauges, pressure sensors) to ADCs. 4. **Battery Monitoring:** High-side or low-side current sensing in battery management systems. --- ### 5. Part Number Suffix Meaning (BRZ-R7) * **B:** Performance grade (B-grade usually offers higher precision/lower offset than A-grade). * **R:** Package type (SOIC). * **Z:** RoHS compliant (Lead-free). * **R7:** Packaging format (7-inch Reel, typically containing 1,000 units).