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AD7709BR Folha de dados(PDF) 1 Page - Analog Devices |
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AD7709BR Folha de dados(HTML) 1 Page - Analog Devices |
1 / 17 page AD7709 a REV. PrA January 2001 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. 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., 2001 16-Bit Sigma Delta ADC with Current Sources, SwitchableReferenceInputsandI/OPort Preliminary Technical Data PRELIMINARY TECHNICAL DATA 16-BIT SINGLE CHANNEL SIGMA DELTA-ADC Factory Calibrated (field calibration not required) Output settles in one conversion cycle (single conver sion mode) Programmable Gain Front End 16-bit No Missing Codes 13-bit Pk-Pk Resolution @ 20Hz, 20mV Range 16-bit Pk-PK Resolution @ 20Hz, 2.56V Range INTERFACE Three-Wire Serial SPITM, QSPITM, MICROWIRETM and DSP Compatible Schmitt Trigger on SCLK POWER Specified for Single 3V and 5V operation Normal : 2mA @ 3V Powerdown : 20uA (32kHz Crystal Running) On-Chip Functions Rail-to-Rail Input Buffer and PGA Switchable Reference Inputs 3 Configurable Current Sources Low Side Power Swtches Digital I/O Port APPLICATIONS Industrial Process Control Instrumentation Pressure Transducers Portable Instrumentation FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION The AD7709 is a complete analog front-end for low frequency measurement applications. The AD7709 contains a 16-bit sigma delta ADC with PGA and can be configured as 2 fully-differential input channels or 4 pseudo-differential input channels. Inputs signal ranges from 20mV to 2.56V can be directly converted using the AD7709. These signals can be converted directly from a transducer without the need for signal conditioning. Other on-chip features include three software configurable current sources, switchable reference inputs, low side power switches and a 4-bit digital I/O port. The device operates from a 32kHz crystal with an on- board PLL generating the required internal operating frequency. The output data rate from the part is software programmable. The pk-pk resolution from the part varies with the programmed gain and output data rate. The part operates from a single +3V or +5V supply. When operating from +3V supplies, the power dissipation for the part is XmW. The AD7709 are housed in a 24- pin SOIC and TSSOP packages. ® SPIand QSPI are a Registered Trademark of Motorola Inc. ® MICROWIRE is a Registered Trademark of National Semiconductor Corp. FEATURES XTAL1 XTAL2 REFIN2(+) REFIN2(-) VDD OSC. & PLL REFIN1(+) REFIN1(-) SW2/P2 SW1/P1 GND AD7709 I/O PORT VDD AIN1 IOUT 1 IOUT 2 AIN2 AIN3 / P3 AIN4 / P4 MUX BUF PGA AINCOM SERIAL INTERFACE & CONTROL LOGIC DOUT DIN SCLK CS RDY RESET 16-BIT Σ−∆ ADC I1 I2 I3 PWRGND |
Nº de peça semelhante - AD7709BR |
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Descrição semelhante - AD7709BR |
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