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EVAL-AD7711EB Datasheet(PDF) 1 Page - Analog Devices |
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EVAL-AD7711EB Datasheet(HTML) 1 Page - Analog Devices |
1 / 28 page FUNCTIONAL BLOCK DIAGRAM CLOCK GENERATION SERIAL INTERFACE CONTROL REGISTER OUTPUT REGISTER CHARGE-BALANCING A/D CONVERTER AUTO-ZEROED - MODULATOR DIGITAL FILTER AD7711 M U X AGND DGND MODE SDATA SCLK A0 MCLK OUT MCLK IN AIN1(+) AIN1(–) REF IN (–) REF IN (+) SYNC 4.5 A A = 1–128 DRDY TFS RFS REF OUT 2.5V REFERENCE 200 A AIN2 VSS VBIAS AVDD DVDD PGA AVDD RTD2 200 A RTD1 AVDD FEATURES Charge-Balancing ADC 24 Bits, No Missing Codes 0.0015% Nonlinearity 2-Channel Programmable Gain Front End Gains from 1 to 128 1 Differential Input 1 Single-Ended Input Low-Pass Filter with Programmable Filter Cutoffs Ability to Read/Write Calibration Coefficients RTD Excitation Current Sources Bidirectional Microcontroller Serial Interface Internal/External Reference Option Single- or Dual-Supply Operation Low Power (25 mW typ) with Power-Down Mode (7 mW typ) APPLICATIONS RTD Transducers Process Control Smart Transmitters Portable Industrial Instruments LC2MOS Signal Conditioning ADC with RTD Excitation Currents GENERAL DESCRIPTION The AD7711 is a complete analog front end for low frequency measurement applications. The device accepts low level signals directly from a transducer and outputs a serial digital word. It employs a - conversion technique to realize up to 24 bits of no missing codes performance. The input signal is applied to a proprietary programmable gain front end based around an ana- log modulator. The modulator output is processed by an on-chip digital filter. The first notch of this digital filter can be pro- grammed via the on-chip control register, allowing adjustment of the filter cutoff and settling time. The part features one differential analog input and one single- ended analog input as well as a differential reference input. Normally, one of the input channels will be used as the main channel with the second channel used as an auxiliary input to periodically measure a second voltage. It can be operated from a single supply (by tying the VSS pin to AGND), provided that the input signals on the analog inputs are more positive than –30 mV. By taking the VSS pin negative, the part can convert signals down to –VREF on its inputs. The part provides two current sources that can be used to provide excitation in 3-wire and 4-wire RTD configurations. The AD7711 thus performs all signal conditioning and conversion for a single- or dual-channel system. AD7711 The AD7711 is ideal for use in smart, microcontroller based systems. Gain settings, signal polarity, input channel selection, and RTD current control can be configured in software using the bidirectional serial port. The AD7711 contains self- calibration, system calibration, and background calibration options, and also allows the user to read and write the on-chip calibration registers. CMOS construction ensures low power dissipation, and a software programmable power-down mode reduces the standby power consumption to only 7 mW typical. The part is available in a 24-lead, 0.3-inch-wide, plastic and hermetic dual-in-line pack- age (DIP) as well as a 24-lead small outline (SOIC) package. PRODUCT HIGHLIGHTS 1. The programmable gain front end allows the AD7711 to accept input signals directly from an RTD transducer, removing a considerable amount of signal conditioning. On-chip current sources provide excitation for 3-wire and 4-wire RTD configurations. 2. No missing codes ensure true, usable, 23-bit dynamic range coupled with excellent ±0.0015% accuracy. The effects of temperature drift are eliminated by on-chip self-calibration, which removes zero-scale and full-scale errors. 3. The AD7711 is ideal for microcontroller or DSP processor applications with an on-chip control register that allows control over filter cutoff, input gain, channel selection, signal polarity, RTD current control, and calibration modes. 4. The AD7711 allows the user to read and to write the on-chip calibration registers. This means that the microcontroller has much greater control over the calibration procedure. REV. G 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 owners. 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. |
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