Sensors & Transducers e-Digest, Vol. 59, Issue 9, September 2005: Product News
(ISSN 1726- 5479)
Capacitance-to-Digital Converter Simplifies Instrumentation and Sensor Design
Analog Devices, Inc. announced the high-precision, fully integrated converters that address the complex and difficult signal processing challenges of direct capacitance-to-digital. Combining advanced signal processing techniques with high levels of integration, ADIís capacitance-to-digital converter (CDC) attains a level of precision previously only possible with conventional analog voltage-to-digital converters aided by a significant number of discrete components. ADIís devices provide designers significant advantages over existing discrete solutions for capacitance- and impedance-sensing applications that have historically lacked precision and proven difficult and expensive to design. The devices are ideal for a wide range of high-performance instrumentation and sensing applications, from blood pressure monitors and glucose analyzers to position sensors for automobiles and industrial corrosion analysis systems.
Single-chip, high precision CDC Ė the AD7745/6/7 CDC integrates all stages of capacitance-to-digital conversion on one chip reducing costs associated with traditional multi-chip solutions by 65 percent. With 24-bit resolution, the AD7745 is the industryís highest-precision solution for interfacing with capacitive sensors. Ideal for industrial and medical instrumentation and automotive sensing applications. The AD7745 and AD7746 are configured for two-electrode capacitance sensors, while the AD7747 is for one-electrode devices. Specifications include an operating range from 2.7 to 5.25 V, an accuracy of 2 x 10-15 F, a speed of 5 to 90 Hz, and a power consumption of 1 mA max.
Analog Devices, Inc., Wilmington, MA
Technical Support 800-262-5643
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