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AD7861 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD7861 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 7 page a AD7861 FUNCTIONAL BLOCK DIAGRAM REF IN BUSY REF OUT VIN1 VIN2 VIN3 A0 A1 D0 D11 RD CS CLKIN SHA 2.5V REFERENCE AUX0 AUX1 AUX2 AUX3 S0 S1 CONVST RESET M0 M1 12 11-BIT ADC 4-1 MUX OUTPUT REGISTERS SGND AGND DGND VDD AD7861 11-Bit Resolution Simultaneous Sampling A/D Converter 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. FEATURES 11-Bit Resolution Analog-to-Digital Converter Seven Single-Ended Analog Inputs Four Input Channels Simultaneously Sampled Expansion with 4 Multiplexed Inputs Internal 2.5 V Reference 3.2 s Conversion Time per Channel User Definable Channel Sequencing Single Supply +5 V Operation Double Buffered Register Outputs 6.25 MHz to 12.5 MHz Operating Clock Range APPLICATIONS Motor Control 3-Phase Power Measurement Cellular Phones Data Acquisition GENERAL DESCRIPTION The AD7861 is a multichannel simultaneous sampling A/D Converter (ADC) configured for the acquisition of voltage inputs in a motor control solution or three-phase power system. The AD7861 combined with Analog Devices’ 16-bit fixed- point digital signal processor (DSP) provides a low cost 16-bit fixed-point microcontroller solution. The input stage has been designed to accommodate the types of signals frequently found in motor drives. The VIN1, VIN2, and VIN3 channels are simultaneously sampled inputs suitable for stator current acquisition. The AUX0–AUX3 channels are multiplexed and are suitable for slower moving inputs such as temperature and bus voltage of the diode rectifier output in a motor control application. PRODUCT HIGHLIGHTS Simultaneous Sampling of Four Inputs Four channel sample and hold amplifier (SHA) allows out of phase input signals to be sampled simultaneously, preserving the relative phase information. Sample-and-hold acquisition time is 1.6 µs and conversion time per channel is 3.2 µs (using a 12.5 MHz system clock). Flexible Analog Channel Sequencing AD7861 supports acquisition of 2, 3 or 4 channels per group. Converted channel results are stored in registers and the data can be read in any order. The sampling and conversion time for two channels is 8 µs, three channels is 11.2 µs, and four channels is 14.4 µs (using a 12.5 MHz system clock). Single 5 V dc Operation Low power, digital process. REV. B One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000 |
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