The **AD8202W-KGD-R7** is a precision, high-voltage, single-supply difference amplifier specifically designed for current sensing in harsh environments. The suffix "KGD" indicates it is provided as a **Known Good Die**, meaning it is sold as an unpackaged silicon wafer chip that has been fully tested. --- ### 1. Key Technical Specifications | Parameter | Specification | |:---|:---| | **Type** | Difference Amplifier / Current Shunt Monitor | | **Input Common-Mode Range** | -2 V to +65 V | | **Supply Voltage** | 3.5 V to 12 V | | **Operating Temperature** | -40°C to +125°C (Automotive Grade) | | **Gain** | Fixed at 20 V/V | | **CMRR (Common-Mode Rejection)** | > 80 dB (DC to 10 kHz) | | **Form Factor** | KGD (Known Good Die) / Wafer | --- ### 2. Core Features & Architecture * **High Side/Low Side Sensing:** Its ability to handle common-mode voltages up to 65V allows it to monitor current on the high side of a battery or motor, even when the supply voltage to the chip is much lower (e.g., 5V). * **Precision Resistor Network:** The internal thin-film resistors are laser-trimmed, ensuring a precise gain of 20 and high rejection of common-mode noise. * **Automotive Qualified:** The "W" in the part number signifies it is qualified for automotive applications (AEC-Q100 standards), making it highly resistant to electrical noise and thermal stress. * **Zero-Drift Characteristics:** It is designed to maintain accuracy across a wide temperature range, which is critical for battery management systems (BMS). --- ### 3. Functional Pin/Pad Description (Die Level) Since this is a **KGD (Known Good Die)**, the connections are made via bonding pads on the silicon surface: 1. **+IN & -IN:** These connect across a shunt resistor to measure the differential voltage (current). 2. **V+:** The positive power supply input. 3. **VOUT:** The output voltage, which is $20 \times (V_{+IN} - V_{-IN})$ referenced to the REF pin. 4. **REF:** Allows the user to offset the output voltage, enabling bidirectional current sensing. 5. **GND:** System ground. --- ### 4. Typical Applications * **Transmission Control:** Monitoring solenoid currents. * **Electric Power Steering:** High-precision motor current feedback. * **Battery Management Systems (BMS):** Monitoring charge/discharge cycles. * **Motor Control:** Phase current sensing in BLDC motors. --- ### 5. Part Number Breakdown | Prefix/Suffix | Meaning | |:---|:---| | **AD8202** | Base Model Number | | **W** | Automotive Grade | | **KGD** | Known Good Die (Unpackaged chip) | | **R7** | 7-inch Tape and Reel packaging |