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AD7709BRU Datasheet(PDF) 1 Page - Analog Devices |
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AD7709BRU Datasheet(HTML) 1 Page - Analog Devices |
1 / 32 page a AD7709 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. 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 companies. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved. REV. A 16-Bit - ADC with Switchable Current Sources FUNCTIONAL BLOCK DIAGRAM VDD IEXC1 8I IEXC2 8I IOUT1 IOUT2 IEXC3 I OSCILLATOR AND PLL XTAL2 REFIN1(–) REFIN2(–) REFIN1(+) REFIN2(+) XTAL1 DOUT RESET RDY CS SCLK DIN SERIAL INTERFACE AND CONTROL LOGIC BUF PGA MUX I/O PORT VDD 16-BIT - ADC AIN1 AIN2 AIN3/P3 AIN4/P4 AINCOM AD7709 VDD GND PWRGND P1/SW1 P2/SW2 I = 25 A FEATURES 16-Bit - ADC Programmable Gain Front End Simultaneous 50 Hz and 60 Hz Rejection at 20 Hz Update Rate VREF Select™ Allows Absolute and Ratiometric Measurement Capability ISOURCE Select™ 16-Bit No Missing Codes 13-Bit p-p Resolution @ 20 Hz, 20 mV Range 16-Bit p-p Resolution @ 20 Hz, 2.56 V Range INTERFACE 3-Wire Serial SPI®, QSPI™, MICROWIRE™, and DSP Compatible Schmitt Trigger on SCLK POWER Specified for Single 3 V and 5 V Operation Normal: 1.25 mA Typ @ 3 V Power-Down: 7 A (32.768 kHz Crystal Running) ON-CHIP FUNCTIONS Rail-to-Rail Input Buffer and PGA Selectable Reference Inputs 3 Switchable, Ratioed Current Sources for VBE Measurements 4-Bit Digital I/O Port Low-Side Power Switches APPLICATIONS Sensor Measurement Temperature Measurement Pressure Measurements Weigh Scales Portable Instrumentation 4–20 mA Loops GENERAL DESCRIPTION The AD7709 is a complete analog front end for low frequency measurement applications. It contains a 16-bit - ADC, selectable reference inputs, three switchable matched excitation current sources, low-side power switches, and a digital I/O port. The 16-bit channel with PGA accepts fully differential, unipolar, and bipolar input signal ranges from 1.024 REFIN/128 to 1.024 REFIN. It can be configured as two fully differential input channels or four pseudo-differential input channels. Signals can be converted directly from a transducer without the need for signal conditioning. The device operates from a 32.768 kHz crystal with an on-chip PLL generating the required internal operating frequency. The output data rate from the part is software programmable. The p-p resolution from the part varies with the programmed gain and output data rate. The part operates from a single 3 V or 5 V supply. When operating from 3 V supplies, the power dissipation for the part is 3.75 mW. The AD7709 is housed in a 24-lead TSSOP package. |
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