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AD7712 Datasheet(PDF) 1 Page - Analog Devices |
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AD7712 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 29 page  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 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. AD7712 LC2MOS Signal Conditioning ADC FUNCTIONAL BLOCK DIAGRAM CLOCK GENERATION SERIAL INTERFACE OUTPUT REGISTER CHARGE-BALANCING A/D CONVERTER AUTO-ZEROED – MODULATOR DIGITAL FILTER AD7712 AGND DGND MODE SDATA SCLK A0 MCLK OUT MCLK IN AIN1(–) REF IN (–) REF IN (+) SYNC 4.5 A A = 1 – 128 DRDY TFS RFS REF OUT VBIAS VOLTAGE ATTENUATION AIN2 TP STANDBY CONTROL REGISTER VSS 2.5V REFERENCE DVDD AVDD AVDD M U X AIN1(+) PGA FEATURES Charge Balancing ADC 24 Bits No Missing Codes 0.0015% Nonlinearity High Level and Low Level Analog Input Channels Programmable Gain for Both Inputs Gains from 1 to 128 Differential Input for Low Level Channel Low-Pass Filter with Programmable Filter Cutoffs Ability to Read/Write Calibration Coefficients Bidirectional Microcontroller Serial Interface Internal/External Reference Option Single- or Dual-Supply Operation Low Power (25 mW typ) with Power-Down Mode (100 W typ) APPLICATIONS Process Control Smart Transmitters Portable Industrial Instruments GENERAL DESCRIPTION The AD7712 is a complete analog front end for low frequency measurement applications. The device has two analog input channels and accepts either low level signals directly from a trans- ducer or high level ( ±4 V REF) signals, 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 low level input signal is applied to a proprietary programmable gain front end based around an analog modulator. The high level analog input is attenuated before being applied to the same modulator. The modulator output is processed by an on-chip digital filter. The first notch of this digital filter can be programmed via the on-chip control register, allowing adjustment of the filter cutoff and settling time. Normally, one of the channels will be used as the main channel with the second channel used as an auxiliary input to periodi- cally measure a second voltage. The part can be operated from a single supply (by tying the VSS pin to AGND), provided that the input signals on the low level analog input are more positive than –30 mV. By taking the VSS pin negative, the part can con- vert signals down to –VREF on this low level input. This low level input, as well as the reference input, features differential input capability. The AD7712 is ideal for use in smart, microcontroller based systems. Input channel selection, gain settings, and signal polar- ity can be configured in software using the bidirectional serial port. The AD7712 also contains self-calibration, system calibra- tion, and background calibration options, and allows the user to read and to write the on-chip calibration registers. CMOS construction ensures low power dissipation, and a hard- ware programmable power-down mode reduces the standby power consumption to only 100 µW 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 low level analog input channel allows the AD7712 to accept input signals directly from a strain gage or transducer, removing a considerable amount of signal conditioning. To maximize the flexibility of the part, the high level analog input accepts signals of ±4 VREF/GAIN. 2. The AD7712 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, and calibration modes. 3. The AD7712 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. 4. No missing codes ensures 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. |
Número de pieza similar - AD7712_17 |
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Descripción similar - AD7712_17 |
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