**ADXL202AQC-1: A Comprehensive Technical Overview of the Low-Power Dual-Axis Accelerometer**

The **ADXL202AQC-1**, manufactured by Analog Devices, stands as a pivotal component in the realm of low-g micro-machined accelerometers. This device integrates a complete dual-axis acceleration measurement system on a single monolithic IC, renowned for its **exceptionally low power consumption and high precision**. It is engineered to measure both dynamic and static acceleration with a full-scale range of ±2 g, making it an ideal solution for a vast array of applications from industrial instrumentation to consumer electronics.

At the core of the ADXL202AQC-1's operation is a surface-micromachined polysilicon structure built on top of the silicon wafer. This structure functions as a multi-fingered differential capacitor. Under acceleration, the movement of the proof mass unbalances the capacitor, resulting in a differential output. This analog signal is then converted into a digital pulse via a **highly precise duty cycle modulator**. The output is a digital signal whose duty cycle (T1/T2) is directly proportional to the acceleration, allowing for direct interfacing with a microcontroller without the need for an external ADC.

One of the most significant advantages of the ADXL202AQC-1 is its **versatile output interface and flexible programmability**. Key parameters, including the bandwidth and the scale factor, can be user-defined. The bandwidth, set by capacitors CX and CY on the XOUT and YOUT pins, can be adjusted from 0.01 Hz to 5 kHz. Similarly, the output period (T2) is set by a single resistor (RSET), providing designers with immense control over the device's response characteristics to suit specific application needs.

The accelerometer's **ultra-low power consumption, typically below 0.6 mA at 3 V**, makes it a cornerstone for battery-powered and portable devices. This feature is indispensable in modern applications such as wearable health monitors, IoT sensor nodes, and handheld gaming controllers, where extended operational life is critical. Furthermore, its robust design ensures high shock survival (up to 1000 g), enhancing its reliability in harsh environments.

**ICGOOODFIND**: The ADXL202AQC-1 is a quintessential low-power, dual-axis accelerometer that masterfully combines analog precision with digital simplicity. Its programmable bandwidth and duty cycle output offer unparalleled design flexibility, solidifying its status as a go-to solution for precise motion sensing across countless industries.

**Keywords**: **Low-Power**, **Dual-Axis Accelerometer**, **Duty Cycle Modulator**, **Programmable Bandwidth**, **MEMS**