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AD7793 Datasheet(PDF) 1 Page - Analog Devices |
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AD7793 Datasheet(HTML) 1 Page - Analog Devices |
1 / 18 page Low Power, 16/24-Bit Sigma-Delta ADC with Low-Noise In-Amp and Embedded Reference Preliminary Technical Data AD7792/AD7793 REV.PrF 6/04. 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 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 © 2004 Analog Devices, Inc. All rights reserved. FEATURES Resolution: AD7792: 16-Bit AD7793: 24-Bit Low Noise Programmable Gain Instrumentation-Amp RMS noise: 80 nV (Gain = 64) Bandgap Reference with 5ppm/ C Drift typ Power Supply: 2.7 V to 5.25 V operation Normal: 400 µA typ Power-down: 1 µA max Update Rate: 4 Hz to 500 Hz Simultaneous 50 Hz/60 Hz Rejection Internal Clock Oscillator Programmable Current Sources (10 µA/200 µA/1 mA) On-Chip Bias Voltage Generator 100 nA Burnout Currents Independent Interface Power Supply 16-Lead TSSOP Package INTERFACE 3-wire serial SPI®, QSPI™, MICROWIRE™, and DSP compatible Schmitt trigger on SCLK APPLICATIONS Thermocouple Measurements RTD Measurements Thermistor Measurements FUNCTIONAL BLOCK DIAGRAM GND AVDD AD7792/AD7793 SERIAL INTERFACE AND CONTROL LOGIC INTERNAL CLOCK CLK SIGMA DELTA ADC REFIN(+)/AIN3(+) REFIN(-)/AIN3(-) BANDGAP REFERENCE GND IN-AMP VDD GND DOUT/RDY DIN SCLK CS DVDD AIN1(+) AIN1(-) AIN2(+) AIN2(-) VDD IOUT2 VBIAS IOUT1 MUX Figure 1. GENERAL DESCRIPTION The AD7792/AD7793 is a low power, complete analog front end for low frequency measurement applications. The AD7792/AD7793 contains a low noise 16/24-bit ∑-∆ ADC with three differential analog inputs. The on-chip low noise instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC. With a gain setting of 64, the rms noise is 80 nV when the update rate equals 16.6 Hz. The device contains a precision low noise, low drift internal bandgap reference for absolute measurements. An external reference can also be used if ratiometric measurements are re- quired. On-chip programmable excitation current sources can be used to supply a constant current to RTDs and thermistors while the 100 nA burnout currents can be used to ensure that the sensors connected to the ADC are not burnt out. For ther- mocouple applications, the on-chip bias voltage generator steps up the common mode voltage from the thermocouple so that it is within the ADC’s allowable range. The device can be operated with the internal clock or, alterna- tively, an external clock can be used if synchronizing several devices. The output data rate from the part is software pro- grammable and can be varied from 4 Hz to 500 Hz. The part operates with a power supply from 2.7 V to 5.25 V. It consumes a current of 450 uA maximum and is housed in a 16- lead TSSOP package. |
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