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EVAL-CN0350-PMDZ: Piezoelectric Sensor Signal Conditioning

Summary

The circuit shown in Figure 1 is a 12-bit, 1 MSPS data acquisition system utilizing only two active devices. The system processes charge input signals from piezoelectric sensors using a single 3.3 V supply and has a total error of less than 0.25% FSR after calibration over a ±10°C temperature range, making it ideal for a wide variety of laboratory and industrial measurements.

The small footprint of the circuit makes this combination an industry-leading solution for data acquisition systems where accuracy, speed, cost, and size play a critical role.

The circuit design allows single supply operation. The minimum output voltage specification of the AD8608 is 50 mV for a 2.7 V power supply and 290 mV for 5 V power supply with 10 mA load current, over the temperature range of -40°C to +125°C. A minimum output voltage of 45 mV to 60 mV is a conservative estimate for a 3.3 V power supply, a load current less than 1 mA, and a narrower temperature range.

Specifications

Manufacturer Analog Devices Inc.
Category Sensor Solutions
Sub-Category Other Sensing Solutions
Eval Board Part Number EVAL-CN0350-PMDZ-ND
Eval Board Supplier Analog Devices Inc.
Eval Board Normally In Stock
Purpose Piezoelectric
Signal Conditioning
Range Up to 7.5 MHz
Sensing Method Electrochemical Sensor
Voltage In 3.3 V
Features Over Voltage Protection
Shutdown, Enable, Standby
SPI Interface
Voltage Reference
Design Author Analog Devices
Component Count + Extras 24 + 6
Main I.C. Base Part AD7091R
AD8608

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