HJ3110 Universal Integrated Differential Capacitor Reader

HJ3110 is a general-purpose, ultra-low noise, high-resolution capacitive detection interface circuit, suitable for detecting small variations in various MEMS sensors. HJ3110 uses CMOS integrated circuit technology. It is easy to use and requires only a single 5V power supply and a small number of decoupling capacitors, without the need for other peripheral components. MEMS sensors (such as accelerometers, rate sensors, and other capacitive variable mode sensors) require an electronic interface circuit capable of detecting small changes in capacitance. HJ3110 can detect small capacitance changes with a typical value of 4.0aF/rtHz, demonstrating excellent performance. HJ3110 can interface with both differential capacitive sensors and single capacitive change sensors. A linear high output level signal can be obtained across the full-scale range of the sensor capacitance. HJ3110 also includes a chip-level capacitive DAC (digital array capacitor, up to 10pF), which can be used for initial differential adjustment or for quasi-differential operation using virtual capacitance. HJ3110 allows for gain and offset adjustments, and the bandwidth can be user-programmable selected. A chip-level EEPROM is used to store adjustment programs. This device can be widely used in accelerometers (low g), pressure sensors, rate sensors, vector sensors, touch sensors, motion sensors, gas sensors, flow sensors, liquid level control, and displacement measurement.

　　Product features include:

　　Capacitance resolution: 4.0 aF/rtHz;

　　Sensor mode: single capacitance or differential capacitance;

　　Internal virtual capacitance can be used for quasi-differential mode operation and initial adjustment;

　　Equipped with gain and DC offset adjustment functions;

　　Programmable bandwidth adjustment (0.5 to 8 kHz, 9 levels);

　　5V single power supply operation;

　　Includes chip-level EEPROM storage adjustment program;

　　Uses H16-02 type 16-pin ceramic hermetic flat package.

A low noise signal conditioning circuit for an accelerometer is designed to accurately process weak sensor signals while minimizing interference and distortion. It typically includes a low noise amplifier (LNA) to boost small analog signals, followed by filtering stages to remove unwanted high-frequency noise and environmental interference. Precision components and proper grounding techniques are used to ensure signal integrity. The circuit may also incorporate offset correction and gain adjustment to match the accelerometer’s output range with the input requirements of analog-to-digital converters (ADC). This type of circuit is widely used in applications such as vibration monitoring, motion detection, and industrial control systems, where high accuracy and stability are critical for reliable performance.

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