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AD7694 bảng dữ liệu(PDF) 1 Page - Analog Devices |
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AD7694 bảng dữ liệu(HTML) 1 Page - Analog Devices |
1 / 28 page 18-Bit, 2 MSPS PulSAR 15 mW ADC in LFCSP (QFN) AD7986 Rev. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2009–2011 Analog Devices, Inc. All rights reserved. FEATURES 18-bit resolution with no missing codes Throughput: 2 MSPS (TURBO = high), 1.5 MSPS (TURBO = low) Low power dissipation 15 mW at 2 MSPS, with external reference 26 mW at 2 MSPS with internal reference INL: ±1 LSB typical, ±2.5 LSB maximum SNR 95.5 dB, with on-chip reference 97.0 dB, with external reference 4.096 V internal reference: typical drift of 10 ppm/°C True differential analog input voltage range: ±VREF 0 V to VREF with VREF up to 5.0 V Allows use of any input range No pipeline delay Logic interface: 1.8 V/2.5 V/2.7 V Serial interface: SPI/QSPI™/MICROWIRE™/DSP compatible Ability to daisy-chain multiple ADCs with busy indicator 20-lead 4 mm × 4 mm LFCSP (QFN) APPLICATIONS Battery-powered equipment Data acquisition systems Medical instruments Seismic data acquisition systems APPLICATION DIAGRAM 2.7nF 15Ω V– 0V TO VREF NOTES 1. GND REFERS TO REFGND, AGND, AND DGND. V+ 2.7nF 15Ω V– V+ IN– AD7986 IN+ REF AVDD, DVDD VIO BVDD 5V 2.5V 1.8V TO 2.7V VIO SDI SCK SDO CNV 3- OR 4-WIRE INTERFACE: SPI, CS DAISY CHAIN (TURBO = LOW) TURBO 10µF VREF TO 0V GND1 Figure 1. GENERAL DESCRIPTION The AD7986 is an 18-bit, 2 MSPS successive approximation, analog-to-digital converter (ADC). It contains a low power, high speed, 18-bit sampling ADC, an internal conversion clock, an internal reference (and buffer), error correction circuits, and a versatile serial interface port. On the rising edge of CNV, the AD7986 samples the voltage difference between the IN+ and IN− pins. The voltages on these pins usually swing in opposite phases between 0 V and VREF. It features a very high sampling rate turbo mode (TURBO = high) and a reduced power normal mode (TURBO = low) for low power applications where the power is scaled with the throughput. In normal mode (TURBO = low), the SPI-compatible serial interface also features the ability, using the SDI input, to daisy- chain several ADCs on a single 3-wire bus and provide an optional busy indicator. It is compatible with 1.8 V, 2.5 V, and 2.7 V using the separate VIO supply. The AD7986 is available in a 20-lead LFCSP (QFN) with operation specified from −40°C to +85°C. Table 1. MSOP, LFCSP (QFN) 14-/16-/18-Bit PulSAR® ADCs Type 100 kSPS 250 kSPS 400 kSPS to 500 kSPS ≥1000 kSPS ADC Driver 14-Bit AD7940 AD79421 AD79461 16-Bit AD7680 AD76851 AD76861 AD79801 ADA4941-1 AD7683 AD76871 AD76881 AD79831 ADA4841-x AD7684 AD7694 AD76931 18-Bit AD76911 AD76901 AD79821 ADA4941-1 AD79841 ADA4841-x AD7986 AD8021 1 Pin-for-pin compatible. |
Số phần tương tự - AD7694 |
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Mô tả tương tự - AD7694 |
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