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
Date Created By Author	2014-05
Date Added To Library	2018-03