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AD7985 датащи(PDF) 1 Page - Analog Devices |
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AD7985 датащи(HTML) 1 Page - Analog Devices |
1 / 29 page 16-Bit, 2.5 MSPS, PulSAR 15.5 mW ADC in LFCSP Data Sheet AD7985 Rev. C Document Feedback 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 ©2009–2016 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES 16-bit resolution with no missing codes Throughput: 2.5 MSPS (TURBO high), 2.0 MSPS (TURBO low) Low power dissipation 15.5 mW at 2.5 MSPS, with external reference 28 mW at 2.5 MSPS, with internal reference INL: ±0.7 LSB typical, ±1.5 LSB maximum SNR 88.5 dB, with on-chip reference 90 dB, with external reference 4.096 V internal reference: typical drift of ±10 ppm/°C Pseudo differential analog input voltage range 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 Proprietary serial interface SPI-/QSPI™-/MICROWIRE™-/DSP- compatible1 Ability to daisy-chain multiple ADCs with busy indicator 20-lead, 4 mm × 4 mm LFCSP APPLICATIONS Battery-powered equipment Communications ATE Data acquisition systems Medical instruments APPLICATION DIAGRAM 0V TO VREF NOTES 1. GND REFERS TO REFGND, AGND, AND DGND. AD7985 GND 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 IN+ IN– Figure 1. GENERAL DESCRIPTION The AD79851 is a 16-bit, 2.5 MSPS successive approximation analog-to-digital converter (SAR ADC). It contains a low power, high speed, 16-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 AD7985 samples an analog input, IN+, between 0 V and REF with respect to a ground sense, IN−. The AD7985 features a very high sampling rate turbo mode (TURBO is high) and a reduced power normal mode (TURBO is low) for low power applications where the power is scaled with the throughput. In normal mode (TURBO is low), the SPI-compatible serial inter- face 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 supplies using the separate VIO supply. The AD7985 is available in a 20-lead LFCSP with operation specified from −40°C to +85°C. 1 Protected by U. S. Patent 6,703,961. Table 1. MSOP, LFCSP, 14-/16-/18-Bit PulSAR® ADCs1 Type 100 kSPS 250 kSPS 400 kSPS to 500 kSPS ≥1000 kSPS ADC Driver 14-Bit AD7940 AD79422 AD79462 16-Bit AD7680 AD76852 AD76862 AD79802 ADA4941-1 AD7683 AD76872 AD76882 AD79832 ADA4841-1 AD7684 AD7694 AD76932 AD79853 AD8021 18-Bit AD76912 AD76902 AD79822 ADA4941-1 AD79842 ADA4841-1 AD79863 AD8021 1 See www.analog.com for the latest selection of PulSAR ADCs and ADC drivers. 2 Pin for pin compatible with all other devices marked with this endnote. 3 The AD7985 and AD7986 are pin for pin compatible. |
Аналогичный номер детали - AD7985_17 |
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Аналогичное описание - AD7985_17 |
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