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AD5934YRSZ-REEL7 Folha de dados(PDF) 1 Page - Analog Devices |
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AD5934YRSZ-REEL7 Folha de dados(HTML) 1 Page - Analog Devices |
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1 / 32 page  250 kSPS, 12-Bit Impedance Converter, Network Analyzer AD5934 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved. FEATURES Programmable output peak-to-peak excitation voltage to a max frequency of 100 kHz Programmable frequency sweep capability with serial I2C® interface Frequency resolution of 27 bits (<0.1 Hz) Impedance measurement range from 100 Ω to 10 MΩ Phase measurement capability System accuracy of 0.5% 2.7 V to 5.5 V power supply operation Temperature range −40°C to +125°C 16-lead SSOP package APPLICATIONS Electrochemical analysis Bioelectrical impedance analysis Impedance spectroscopy Complex impedance measurement Corrosion monitoring and protection equipment Biomedical and automotive sensors Proximity sensing Nondestructive testing Material property analysis Fuel/battery cell condition monitoring GENERAL DESCRIPTION The AD5934 is a high precision impedance converter system solution which combines an on-board frequency generator with a 12-bit, 250 kSPS, analog-to-digital converter (ADC). The frequency generator allows an external complex impedance to be excited with a known frequency. The response signal from the impedance is sampled by the on-board ADC and a discrete Fourier transform (DFT) is processed by an on-board DSP engine. The DFT algorithm returns a real (R) and imaginary (I) data-word at each output frequency. The magnitude of the impedance and relative phase of the impedance at each frequency point along the sweep is easily calculated using the following two equations: 2 2 I R Magnitude + = ) / ( 1 R I Tan Phase − = Table 1. Related Devices Part No. Description AD5933 2.7 V to 5.5 V. 1 MSPS, 12-bit impedance, with internal temperature sensor, 16-lead SSOP. FUNCTIONAL BLOCK DIAGRAM ADC (12 BITS) VDD/2 DDS CORE (27 BITS) DAC Z( ω) I2C INTERFACE IMAGINARY REGISTER GAIN REAL REGISTER 1024-POINT DFT LPF SCL SDA DVDD AVDD MCLK AGND DGND ROUT VOUT AD5934 RFB VIN Figure 1. |
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