Datenblatt-Suchmaschine für elektronische Bauteile |
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AD7711AN Datenblatt(PDF) 1 Page - Analog Devices |
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AD7711AN Datenblatt(HTML) 1 Page - Analog Devices |
1 / 28 page a FUNCTIONAL BLOCK DIAGRAM FEATURES Charge Balancing ADC 24 Bits No Missing Codes 0.0015% Nonlinearity Two-Channel Programmable Gain Front End Gains from 1 to 128 One Differential Input One 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 REV. F 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. 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 sigma-delta 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 analog modulator. The modulator output is pro- cessed by an on-chip digital filter. The first notch of this digital filter can be programmed via the on-chip control register allow- ing 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 three- wire and four-wire RTD configurations. The AD7711 thus performs all signal conditioning and conversion for a single or dual channel system. The AD7711 is ideal for use in smart, microcontroller based systems. Gain settings, signal polarity, input channel selection AD7711* 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 soft- ware 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 package (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 three-wire and four-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 which 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. 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., 1998 *Protected by U.S. Patent No. 5,134,401. 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 |
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