## Detailed Technical Overview: AD629BRZ-R7 The **AD629BRZ-R7** is a high common-mode voltage difference amplifier manufactured by **Analog Devices**. It is specifically designed to extract small differential signals in the presence of high common-mode voltages (up to ±270V). ### 1. Key Specifications | Parameter | Specification | | :--- | :--- | | **Common-Mode Voltage Range** | ±270 V | | **Gain** | 1 (Fixed) | | **Supply Voltage Range** | ±2.5 V to ±18 V | | **Package / Case** | 8-SOIC (Small Outline Integrated Circuit) | | **Operating Temperature** | -40°C to +85°C | | **Common-Mode Rejection (CMRR)** | 86 dB (Minimum) | | **Bandwidth** | 500 kHz | --- ### 2. Internal Architecture and Pinout The device utilizes a precision internal resistor network to divide down high voltages before they reach the internal op-amp, allowing it to handle voltages far exceeding its own supply rails. | Pin Number | Pin Name | Description | | :--- | :--- | :--- | | 1 | NC | No internal connection | | 2 | -IN | Inverting Input | | 3 | +IN | Non-Inverting Input | | 4 | -V_S | Negative Power Supply | | 5 | REF | Reference (Ground or Offset) | | 6 | OUT | Output Signal | | 7 | +V_S | Positive Power Supply | | 8 | NC | No internal connection | --- ### 3. Functional Advantages * **High Voltage Protection:** The internal resistor bridge protects the op-amp from transients and high DC levels. * **Precision Resistors:** The resistors are laser-trimmed, ensuring excellent Gain Accuracy and CMRR without requiring external components. * **Versatility:** By applying a voltage to the **REF** pin, the output can be shifted, which is useful for interfacing with single-supply ADCs. --- ### 4. Typical Applications * **High-Side Current Sensing:** Measuring current in high-voltage motor controllers or power supplies. * **Isolation Substitution:** Can sometimes replace expensive isolation amplifiers in non-safety critical applications. * **Battery Stack Monitoring:** Measuring individual cell voltages in high-voltage battery strings. --- ### 5. Part Number Breakdown (AD629BRZ-R7) ```text AD629 - Base Model Number B - Grade (Performance level, B is typically higher precision than A) R - Package Code (R = SOIC) Z - RoHS Compliant (Lead-Free) R7 - Packaging Type (7-inch Tape and Reel, usually 500 or 1000 units) ```