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AD7177-2 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD7177-2 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 59 page 32-Bit, 10 kSPS, Sigma-Delta ADC with 100 μs Settling and True Rail-to-Rail Buffers Data Sheet AD7177-2 Rev. A 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 ©2015 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES 32-bit data output Fast and flexible output rate: 5 SPS to 10 kSPS Channel scan data rate of 10 kSPS/channel (100 μs settling) Performance specifications 19.1 noise free bits at 10 kSPS 20.2 noise free bits at 2.5 kSPS 24.6 noise free bits at 5 SPS INL: ±1 ppm of FSR 85 dB filter rejection of 50 Hz and 60 Hz with 50 ms settling User configurable input channels 2 fully differential channels or 4 single-ended channels Crosspoint multiplexer On-chip 2.5 V reference (±2 ppm/°C drift) True rail-to-rail analog and reference input buffers Internal or external clock Power supply: AVDD1 − AVSS = 5 V, AVDD2 = IOVDD = 2.5 V to 5 V Split supply with AVDD1/AVSS at ±2.5 V ADC current: 8.4 mA Temperature range: −40°C to +105°C 3- or 4-wire serial digital interface (Schmitt trigger on SCLK) Serial port interface (SPI), QSPI, MICROWIRE, and DSP compatible APPLICATIONS Process control: PLC/DCS modules Temperature and pressure measurement Medical and scientific multichannel instrumentation Chromatography GENERAL DESCRIPTION The AD7177-2 is a 32-bit low noise, fast settling, multiplexed, 2-/4-channel (fully/pseudo differential) Σ-Δ analog-to-digital converter (ADC) for low bandwidth inputs. It has a maximum channel scan rate of 10 kSPS (100 μs) for fully settled data. The output data rates range from 5 SPS to 10 kSPS. The AD7177-2 integrates key analog and digital signal condition- ing blocks to allow users to configure an individual setup for each analog input channel in use. Each feature can be user selected on a per channel basis. Integrated true rail-to-rail buffers on the analog inputs and external reference inputs provide easy to drive high impedance inputs. The precision 2.5 V low drift (2 ppm/°C) band gap internal reference (with output reference buffer) adds embedded functionality to reduce external component count. The digital filter allows simultaneous 50 Hz and 60 Hz rejection at a 27.27 SPS output data rate. The user can switch between different filter options according to the demands of each channel in the application. The ADC automatically switches through each selected channel. Further digital processing functions include offset and gain calibration registers, configurable on a per channel basis. The device operates with a 5 V AVDD1 supply, or with ±2.5 V AVDD1/AVSS, and 2 V to 5 V AVDD2 and IOVDD supplies. The specified operating temperature range is −40°C to +105°C. The AD7177-2 is available in a 24-lead TSSOP package. FUNCTIONAL BLOCK DIAGRAM AVSS GPIO0 GPIO1 XTAL1 XTAL2/CLKIO DGND REF– REF+ REFOUT AIN0 AIN1 AIN2 AIN3 AIN4 Σ-∆ ADC 1.8V LDO INT REF AVDD1 AVDD2 REGCAPA 1.8V LDO IOVDD REGCAPD GPIO AND MUX I/O CONTROL SERIAL INTERFACE AND CONTROL TEMPERATURE SENSOR DIGITAL FILTER AD7177-2 BUFFERED PRECISION REFERENCE XTAL AND INTERNAL CLOCK OSCILLATOR CIRCUITRY CS SCLK DIN DOUT/RDY SYNC/ERROR CROSSPOINT MULTIPLEXER AVDD AVSS RAIL-TO-RAIL ANALOG INPUT BUFFERS RAIL-TO-RAIL REFERENCE INPUT BUFFERS Figure 1. |
Podobny numer części - AD7177-2 |
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Podobny opis - AD7177-2 |
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