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AD7713SQ Folha de dados(PDF) 1 Page - Analog Devices |
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AD7713SQ Folha de dados(HTML) 1 Page - Analog Devices |
1 / 28 page a FUNCTIONAL BLOCK DIAGRAM AD7713 AIN2(+) AIN2(–) AIN3 STANDBY CLOCK GENERATION SERIAL INTERFACE CONTROL REGISTER OUTPUT REGISTER CHARGING BALANCING A/D CONVERTER AUTO-ZEROED ∑ − ∆ MODULATOR DIGITAL FILTER AGND DGND MODE SDATA SCLK A0 MCLK OUT MCLK IN AIN1(+) AIN1(–) REF IN(–) REF IN(+) AVDD DVDD AVDD 1µA A = 1 – 128 AVDD 200µA VBIAS SYNC DRDY TFS RFS RTD2 PGA 200µA RTD1 INPUT SCALING M U X FEATURES Charge Balancing ADC 24 Bits No Missing Codes 0.0015% Nonlinearity Three-Channel Programmable Gain Front End Gains from 1 to 128 Two Differential Inputs One Single Ended High Voltage Input Low-Pass Filter with Programmable Filter Cutoffs Ability to Read/Write Calibration Coefficients Bidirectional Microcontroller Serial Interface Single Supply Operation Low Power (3.5 mW typ) with Power-Down Mode (150 W typ) APPLICATIONS Loop Powered (Smart) Transmitters RTD Transducers Process Control Portable Industrial Instruments LC2MOS Loop-Powered Signal Conditioning ADC REV. C 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. AD7713* © Analog Devices, Inc., 1995 One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 CMOS construction ensures low power dissipation and a hard- ware programmable power-down mode reduces the standby power consumption to only 150 µW typical. The part is avail- able in a 24-pin, 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 AD7713 consumes less than 1 mA in total supply cur- rent, making it ideal for use in loop-powered systems. 2. The two programmable gain channels allow the AD7713 to accept input signals directly from a transducer removing a considerable amount of signal conditioning. To maximize the flexibility of the part, the high level analog input accepts 4 × V REF signals. On-chip current sources provide excitation for three-wire and four-wire RTD configurations. 3. No Missing Codes ensures true, usable, 24-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. 4. The AD7713 is ideal for microcontroller or DSP processor applications with an on-chip control register which allows control over filter cutoff, input gain, signal polarity and cali- bration modes. The AD7713 allows the user to read and write the on-chip calibration registers. GENERAL DESCRIPTION The AD7713 is a complete analog front end for low frequency measurement applications. The device accepts low level signals directly from a transducer or high level signals (4 × V REF) and outputs a serial digital word. It employs a sigma-delta con- version technique to realize up to 24 bits of no missing codes performance. The input signal is applied to a proprietary pro- grammable gain front end based around an analog 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. The part features two differential analog inputs and one single- ended high level analog input as well as a differential reference input. It can be operated from a single supply (AVDD and DVDD at +5 V). The part provides two current sources which can be used to provide excitation in three-wire and four-wire RTD con- figurations. The AD7713 thus performs all signal conditioning and conversion for a single, dual or three-channel system. The AD7713 is ideal for use in smart, microcontroller-based systems. Gain settings, signal polarity and RTD current control can be configured in software using the bidirectional serial port. The AD7713 contains self-calibration, system calibration and background calibration options and also allows the user to read and to write the on-chip calibration registers. *Protected by U.S. Patent No. 5,134,401. |
Nº de peça semelhante - AD7713SQ |
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Descrição semelhante - AD7713SQ |
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