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AD7715ACHIPS-3 数据表(PDF) 1 Page - Analog Devices |
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AD7715ACHIPS-3 数据表(HTML) 1 Page - Analog Devices |
1 / 31 page FUNCTIONAL BLOCK DIAGRAM PGA BUFFER CHARGE BALANCING A/D CONVERTER SIGMA-DELTA MODULATOR DIGITAL FILTER REF IN(–) REF IN(+) AVDD DVDD A = 1–128 MCLK IN MCLK OUT RESET AIN(+) AIN(–) SERIAL INTERFACE REGISTER BANK SCLK CS DIN DOUT DRDY CLOCK GENERATION AGND DGND AD7715 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. a 3 V/5 V, 450 A 16-Bit, Sigma-Delta ADC AD7715* FEATURES Charge-Balancing ADC 16 Bits No Missing Codes 0.0015% Nonlinearity Programmable Gain Front End Gains of 1, 2, 32 and 128 Differential Input Capability Three-Wire Serial Interface SPI™, QSPI™, MICROWIRE™ and DSP Compatible Ability to Buffer the Analog Input 3 V (AD7715-3) or 5 V (AD7715-5) Operation Low Supply Current: 450 A max @ 3 V Supplies Low-Pass Filter with Programmable Output Update 16-Lead SOIC/DIP/TSSOP CMOS construction ensures very low power dissipation, and the power-down mode reduces the standby power consumption to 50 µW typ. The part is available in a 16-lead, 0.3 inch-wide, plastic dual-in-line package (DIP) as well as a 16-lead 0.3 inch- wide small outline (SOIC) package and a 16-lead TSSOP package. PRODUCT HIGHLIGHTS 1. The AD7715 consumes less than 450 µA in total supply current at 3 V supplies and 1 MHz master clock, making it ideal for use in low-power systems. Standby current is less than 10 µA. 2. The programmable gain input allows the AD7715 to accept input signals directly from a strain gage or transducer remov- ing a considerable amount of signal conditioning. 3. The AD7715 is ideal for microcontroller or DSP processor applications with a three-wire serial interface reducing the number of interconnect lines and reducing the number of opto-couplers required in isolated systems. The part con- tains on-chip registers which allow software control over output update rate, input gain, signal polarity and calibration modes. 4. The part features excellent static performance specifications with 16-bits no missing codes, ±0.0015% accuracy and low rms noise (<550 nV). Endpoint errors and the effects of temperature drift are eliminated by on-chip calibration op- tions, which remove zero-scale and full-scale errors. GENERAL DESCRIPTION The AD7715 is a complete analog front end for low frequency measurement applications. The part can accept low level input signals directly from a transducer and outputs a serial digital word. It employs a sigma-delta conversion technique to realize up to 16 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 output update rate. The AD7715 features a differential analog input as well as a dif- ferential reference input. It operates from a single supply (+3 V or +5 V). It can handle unipolar input signal ranges of 0 mV to +20 mV, 0 mV to +80 mV, 0 V to +1.25 V and 0 V to +2.5 V. It can also handle bipolar input signal ranges of ±20 mV, ±80 mV, ±1.25 V and ±2.5 V. These bipolar ranges are referenced to the negative input of the differential analog input. The AD7715 thus performs all signal conditioning and conversion for a single- channel system. The AD7715 is ideal for use in smart, microcontroller or DSP based systems. It features a serial interface that can be config- ured for three-wire operation. Gain settings, signal polarity and update rate selection can be configured in software using the input serial port. The part contains self-calibration and system calibration options to eliminate gain and offset errors on the part itself or in the system. SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corporation. *Protected by U.S. Patent No: 5,134,401. See page 30 for data sheet index. 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., 2000 |
类似零件编号 - AD7715ACHIPS-3 |
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类似说明 - AD7715ACHIPS-3 |
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