## AD8209AWBRMZ-R7: Technical Overview The **AD8209AWBRMZ-R7** is a high-performance, single-supply, difference amplifier manufactured by Analog Devices. It is specifically designed for high-side current sensing in demanding automotive and industrial applications. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Type** | Difference Amplifier / Current Sense Amplifier | | **Common-Mode Voltage** | -2 V to +45 V (Continuous), -5 V to +65 V (Survival) | | **Operating Supply** | 4.5 V to 5.5 V | | **Gain** | Fixed at 14 V/V | | **CMRR** | 80 dB (minimum, DC to 10 kHz) | | **Bandwidth** | 80 kHz | | **Package** | MSOP-8 (Mini Small Outline Package) | | **Automotive Grade** | AEC-Q100 Qualified | --- ### 2. Core Features and Functionality #### A. High Common-Mode Rejection The primary strength of the AD8209 is its ability to extract a small differential signal (from a shunt resistor) while ignoring very high common-mode voltages. It can accurately track current even when the line voltage fluctuates between -2V and +45V. #### B. Internal Architecture The device consists of two main stages: 1. **Differential Amplifier Stage:** Features a robust input that handles high voltages. 2. **Instrumentation Stage:** Provides the gain and allows for offset adjustments using the reference pins. #### C. Bi-directional Capability By applying a voltage to the `REF1` and `REF2` pins, the output can be offset. This allows the amplifier to measure current flowing in both directions (charging/discharging), which is critical for motor control and battery management. --- ### 3. Pin Configuration (MSOP-8) | Pin # | Name | Description | | :--- | :--- | :--- | | 1 | **-IN** | Inverting Input (Connect to load side of shunt) | | 2 | **GND** | Ground | | 3 | **REF2** | Reference Input 2 (Controls Output Offset) | | 4 | **NC** | No Connection | | 5 | **OUT** | Output Voltage | | 6 | **VCC** | Supply Voltage (Typically 5V) | | 7 | **REF1** | Reference Input 1 (Controls Output Offset) | | 8 | **+IN** | Non-inverting Input (Connect to supply side of shunt) | --- ### 4. Typical Applications * **Transmission Control:** Monitoring solenoid currents. * **Electric Power Steering (EPS):** Sensing motor phase currents. * **Motor Control:** DC-DC converters and BLDC motor drives. * **Battery Management:** Monitoring charge and discharge cycles in EVs. --- ### 5. Ordering Information Suffix: "R7" The **-R7** suffix indicates the packaging format: **7-inch Tape and Reel**, typically containing 1,000 units. The **W** indicates the automotive grade, and **RMZ** refers to the Lead-Free MSOP package.